{"id":3725,"date":"2013-10-14T00:37:51","date_gmt":"2013-10-13T16:37:51","guid":{"rendered":"http:\/\/www.zhangxinxu.com\/wordpress\/?p=3725"},"modified":"2018-01-02T03:21:30","modified_gmt":"2018-01-01T19:21:30","slug":"understand-domstring-document-formdata-blob-file-arraybuffer","status":"publish","type":"post","link":"https:\/\/www.zhangxinxu.com\/wordpress\/2013\/10\/understand-domstring-document-formdata-blob-file-arraybuffer\/","title":{"rendered":"\u7406\u89e3DOMString\u3001Document\u3001FormData\u3001Blob\u3001File\u3001ArrayBuffer\u6570\u636e\u7c7b\u578b"},"content":{"rendered":"<p>by <a href=\"http:\/\/www.zhangxinxu.com\/\">zhangxinxu<\/a> from <a href=\"http:\/\/www.zhangxinxu.com\/\">http:\/\/www.zhangxinxu.com<\/a><br \/>\n\u672c\u6587\u5730\u5740\uff1a<a href=\"http:\/\/www.zhangxinxu.com\/wordpress\/?p=3725\">http:\/\/www.zhangxinxu.com\/wordpress\/?p=3725<\/a><\/p>\n<style>dt code{font-weight:bold;border-color:#bbb;}<\/style>\n<h3>\u4e00\u3001XMLHttpRequest 2.0\u7684\u5bb6\u81e3\u4eec<\/h3>\n<p>\u6211\u5927\u5b66\u90a3\u4f1a\u513f\uff0c\u4e00\u4e2a\u79f0\u4e3aAjax\u7684\u4e1c\u897f\u5bf9\u524d\u7aef\u884c\u4e1a\u9020\u6210\u4e86\u6df1\u8fdc\u5f71\u54cd\uff0c\u4e0d\u4ec5\u662fJS\u8bed\u8a00\uff0c\u800c\u5305\u62ec\u524d\u7aef\u5730\u4f4d\u3001\u804c\u4f4d\u5174\u8d77\u4ee5\u53ca\u5de5\u4f5c\u5206\u5de5\u7b49\u3002\u629b\u5f00IE6\u6d4f\u89c8\u5668\u4e0d\u8c08\uff0c\u5176\u4ed6\u6d4f\u89c8\u5668\u7684Ajax\u5b9e\u9645\u4e0a\u90fd\u662f\u501f\u52a9<code>XMLHttpRequest<\/code>\u5b9e\u73b0\u7684\u3002<\/p>\n<p>\u7136\u540e\uff0c\u597d\u591a\u5e74\u8fc7\u53bb\u4e86\uff0c<code>XMLHttpRequest<\/code>\u5e26\u7740\u4e24\u4f4d\u5bb6\u81e3\uff0c<code>DOMString<\/code>\u548c<code>Document<\/code>\u6570\u636e\u7c7b\u578b\u653b\u57ce\u7565\u5730\uff0c\u51e0\u4e4e\u4e00\u7edf\u5929\u4e0b\u3002<\/p>\n<p>\u7136\u65f6\u4ee3\u662f\u53d1\u5c55\u7684\uff0c\u4eba\u4eec\u7fa4\u4f17\u7684\u9700\u6c42\u662f\u65fa\u76db\u7684\uff0cHTML5\u72b9\u5982\u5189\u5189\u5347\u8d77\u7684\u65b0\u661f\u5f00\u59cb\u666e\u7167\u5927\u5730\uff0c\u6069\u6cfd\u5927\u4f17\u3002<code>XMLHttpRequest<\/code>\u7531\u4e8e\u5c31\u4e24\u4e2a\u5bb6\u81e3<code>DOMString<\/code>\u548c<code>Document<\/code>\uff0c\u4e14\u5e76\u4e0d\u662f100%\u542c\u8bdd\u3002\u56e0\u6b64\uff0c\u5176\u5df2\u7ecf\u5f00\u59cbhold\u4e0d\u4f4fHTML5\u7684\u8000\u773c\u5149\u8292\u4e86\u3002\u4e3a\u4e86\u987a\u5e94\u65f6\u4ee3\u7684\u6f6e\u6d41\uff0c<code>XMLHttpRequest<\/code>\u51f9\u51f8\u66fc\u53d8\u8eab\u5347\u7ea7\u5230<code>2.0<\/code>\uff0c\u53d8\u5316\u8bf8\u591a\uff0c\u5176\u4e2d\u4e00\u4e2a\u5f88\u91cd\u8981\u7684\u53d8\u5316\u5c31\u662f\u5e7f\u62db\u5bb6\u81e3\uff0c\u6269\u5f20\u5b9e\u529b\uff0c\u4e0eHTML5\u4e00\u8d77\u5b8c\u6210\u5343\u79cb\u4e07\u8f7d\u4e4b\u5927\u4e1a\u3002<\/p>\n<p>\u8fd9\u4e9b\u5bb6\u81e3\u6709\uff1a<code>DOMString<\/code>\u3001<code>Document<\/code>\u3001<code>FormData<\/code>\u3001<code>Blob<\/code>\u3001<code>File<\/code>\u3001<code>ArrayBuffer<\/code>\u8fd9\u4e9b\u7c7b\u578b\u3002\u4e5f\u5c31\u662f\u5728<code>XMLHttpRequest Level 2<\/code>\u80cc\u666f\u4e0b\uff0c\u6211\u4eecAjax\u53ef\u4ee5\u53d1\u9001\u4efb\u610f\u8fd9\u4e9b\u7c7b\u578b\u7684\u6570\u636e\u3002\u6709\u4e86\u8bf8\u591a\u5fe0\u5b9e\u53ef\u9760\u7684\u5bb6\u81e3\uff0c<code>XMLHttpRequest Level 2<\/code>\u72b9\u5982\u7ec7\u7530\u4fe1\u957f\u822c\u52bf\u4e0d\u53ef\u6321\uff0c\u524d\u9014\u65e0\u91cf\uff01<\/p>\n<blockquote><p>\u7ec7\u7530\u4fe1\u957f\u5bb6\u81e3\u6709\uff1a\u7fbd\u67f4\u79c0\u5409\u3001\u67f4\u7530\u80dc\u5bb6\u3001\u660e\u667a\u5149\u79c0\u3001\u7af9\u4e2d\u534a\u5175\u536b\u3001\u9ed1\u7530\u5b98\u5175\u536b\u3001\u7ec7\u7530\u4fe1\u5fe0\u3001\u6cf7\u5ddd\u4e00\u76ca\u3001\u4e39\u7fbd\u957f\u79c0\u3001\u524d\u7530\u5229\u5bb6\u3001\u6c60\u7530\u6052\u5174\u3001\u4f50\u4e45\u95f4\u4fe1\u76db\u3001\u68ee\u5170\u4e38\u3001\u4e5d\u9b3c\u5609\u9686<\/p><\/blockquote>\n<h3>\u4e8c\u3001\u5bb6\u81e3\u4e4bDOMString<\/h3>\n<p>\u8ddf\u7740<code>XMLHttpRequest<\/code>\u95ef\u5357\u8d70\u5317\u5f88\u591a\u5e74\uff0c\u770b\u540d\u5b57\u4f3c\u4e4e\u5f88\u56a3\u5f20\u4e14\u9ad8\u6df1\u83ab\u6d4b\u3002\u5b9e\u9645\u4e0a\uff0c\u5728JavaScript\u4e2d\uff0c<code>DOMString<\/code>\u5c31\u662f<code>String<\/code>\u3002\u89c4\u8303\u89e3\u91ca\u8bf4<code>DOMString<\/code>\u6307\u7684\u662fUTF-16\u5b57\u7b26\u4e32\uff0c\u800cJavaScript\u6b63\u662f\u4f7f\u7528\u4e86\u8fd9\u79cd\u7f16\u7801\u7684\u5b57\u7b26\u4e32\uff0c\u56e0\u6b64\uff0c\u5728Ajax\u4e2d\uff0cDOMString\u5c31\u7b49\u540c\u4e8eJS\u4e2d\u7684\u666e\u901a\u5b57\u7b26\u4e32\u3002<\/p>\n<p>\u5927\u5bb6\u5e94\u8be5\u90fd\u4e0e<code>XMLHttpRequest<\/code>\u4e2d\u6570\u636e\u8fd4\u56de\u5c5e\u6027\u4e4b<code>responseText<\/code>\u6253\u8fc7\u4ea4\u9053\u5427\uff0c\u6309\u7167\u6211\u7684\u7406\u89e3\uff0c\u8fd9\u53ae\u5c31\u662f\u4e0e<code>DOMString<\/code>\u6570\u636e\u7c7b\u578b\u53d1\u751f\u5173\u7cfb\u7684\uff0c\u8868\u660e\u8fd4\u56de\u7684\u6570\u636e\u662f\u5e38\u89c4\u5b57\u7b26\u4e32\u3002<\/p>\n<h3>\u4e09\u3001\u5bb6\u81e3\u4e4bDocument\u6570\u636e\u7c7b\u578b<\/h3>\n<p>\u5982\u679c\u5355\u7eaf\u770bDocument\u5bf9\u8c61\uff0c\u5219\u89e3\u91ca\u5f88\u591a\uff0c\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u53ea\u8981\u5173\u6ce8\u4e0b\u56fe\u6807\u6ce8\u7684\u8fd9\u4e00\u4e2a\uff1a<br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201310\/2013-10-10_203238.png\" width=\"591\" height=\"194\" alt=\"responseXML\" class=\"alignnone\" \/><\/p>\n<p>\u53ef\u4ee5\u770b\u5230\uff0c\u5b9e\u9645\u4e0a\u5c31\u662f<code>XMLHttpRequest<\/code>\u4e2d\u6570\u636e\u8fd4\u56de\u5c5e\u6027\u4e4b<code>responseXML<\/code>\uff0c\u4e5f\u5c31\u662f\u53ef\u4ee5\u89e3\u6790\u4e3a<code>XML<\/code>\u7684\u6570\u636e\u3002\u56e0\u6b64\uff0c\u8fd9\u91cc\u7684Document\u6570\u636e\u7c7b\u4f3c\u4f60\u5c31\u53ef\u4ee5\u8fd1\u4f3c\u770b\u6210<code>XML<\/code>\u6570\u636e\u7c7b\u578b\u3002<\/p>\n<p><code>DOMString<\/code>\u548c<code>Document<\/code>\u90fd\u662f<code>XMLHttpRequest<\/code>\u65f6\u4ee3\u5c31\u8ddf\u968f\u7684\u6570\u636e\u7c7b\u578b\uff0c\u5143\u8001\u7ea7\u3002\u4e0b\u9762\u8fd9\u4e9b\u6570\u636e\u7c7b\u578b\u90fd\u662f<code>XMLHttpRequest 2.0<\/code>\u65b0\u589e\u7684\uff0c\u65b0\u62db\u7684\u5bb6\u81e3\uff0c\u5404\u6000\u7edd\u6280\u54e6\uff01<\/p>\n<h3>\u56db\u3001\u5bb6\u81e3\u4e4bFormData\u5bf9\u8c61<\/h3>\n<blockquote><p>XMLHttpRequest Level 2\u6dfb\u52a0\u4e86\u4e00\u4e2a\u65b0\u7684\u63a5\u53e3<code>FormData<\/code>. \u5229\u7528<code>FormData<\/code>\u5bf9\u8c61\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7JavaScript\u7528\u4e00\u4e9b\u952e\u503c\u5bf9\u6765\u6a21\u62df\u4e00\u7cfb\u5217\u8868\u5355\u63a7\u4ef6\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528XMLHttpRequest\u7684<code>send()<\/code>\u65b9\u6cd5\u6765\u5f02\u6b65\u7684\u63d0\u4ea4\u8fd9\u4e2a&#8221;\u8868\u5355&#8221;\u3002\u6bd4\u8d77\u666e\u901a\u7684ajax, \u4f7f\u7528<code>FormData<\/code>\u7684\u6700\u5927\u4f18\u70b9\u5c31\u662f\u6211\u4eec\u53ef\u4ee5\u5f02\u6b65\u4e0a\u4f20\u4e00\u4e2a\u4e8c\u8fdb\u5236\u6587\u4ef6\u3002<\/p><\/blockquote>\n<p>\u4ee5\u4e0a\u4e3a\u5b98\u65b9\u53e3\u543b\u7684\u89e3\u91ca\uff0c\u7565\u62bd\u8c61\u3002\u6211\u4eec\u5e94\u8be5\u90fd\u7528\u8fc7jQuery\uff0c\u5176\u4e2d\u6709\u4e2a\u65b9\u6cd5\u53eb\u505a<code>serialize()<\/code>, \u4f5c\u7528\u5c31\u662f\u8868\u5355\u5e8f\u5217\u5316\uff0c\u4e5f\u5c31\u662f\u4ee5\u67e5\u8be2\u5b57\u7b26\u4e32\u5f62\u5f0f\u83b7\u5f97\u7c7b\u8868\u5355post\/get\u7684\u6570\u636e\u7ed9Ajax\u8bf7\u6c42\uff0c\u4f8b\u5982\uff1a<code>userid=123&amp;username=zxx<\/code>.<\/p>\n<p><code>FormData<\/code>\u5bf9\u8c61\u7684\u4f5c\u7528\u5c31\u7c7b\u4f3c\u4e8e\u8fd9\u91cc\u7684<code>serialize()<\/code>\u65b9\u6cd5\uff0c\u4e0d\u8fc7<code>FormData<\/code>\u662f\u6d4f\u89c8\u5668\u539f\u751f\u7684\uff0c\u4e14\u652f\u6301\u4e8c\u8fdb\u5236\u6587\u4ef6\uff0c\u662f\u4e2a\u4e00\u773c\u5c31\u4f1a\u8ba9\u4eba\u559c\u6b22\u7684\u5f88\u8d5e\u7684\u4e1c\u897f\uff01<\/p>\n<p><strong>\u517c\u5bb9\u6027<\/strong>\u5982\u4e0b\uff1a<br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201310\/2013-10-11_190619.png\" width=\"579\" height=\"363\" alt=\"formData\u517c\u5bb9\u6027 \u5f20\u946b\u65ed-\u946b\u7a7a\u95f4-\u946b\u751f\u6d3b\" class=\"alignnone\" \/><\/p>\n<p>IE10+\u6d4f\u89c8\u5668\u5df2\u7ecf\u826f\u597d\u652f\u6301\u4e86\uff0c\u4e0b\u9762\u8981\u4ecb\u7ecd\u7684\u5176\u4ed6\u5bb6\u81e3\u4e5f\u90fd\u662fIE10+\u652f\u6301\u3002<\/p>\n<p>\u5b9e\u9645\u4f7f\u7528\u662f\u4f5c\u4e3a\u6784\u9020\u51fd\u6570\uff0c\u5982\u4e0b\uff1a<\/p>\n<div class=\"zxx_code\">\n<pre>new FormData ([\u53ef\u9009]HTMLFormElement)<\/pre>\n<\/div>\n<p><code>HTMLFormElement<\/code>\u8fd9\u4e2a\u53c2\u6570\u53ef\u9009\uff0c\u53ef\u6709\u53ef\u65e0\u3002\u8868\u793a<code>form<\/code>\u8868\u5355\u5143\u7d20\uff0c\u5c31\u662f\u6211\u4eec\u8981\u5e8f\u5217\u5316\uff0c\u8981\u63d0\u4ea4\u7684\u90a3\u4e2a\u8868\u5355\u5143\u7d20\u3002<\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<div class=\"zxx_code\">\n<pre>var newFormData = new FormData(someFormElement);<\/pre>\n<\/div>\n<p><code>newFormData<\/code>\u5c31\u662f<code>someFormElement<\/code>\u8fd9\u4e2a\u8868\u5355\u5143\u7d20\u4e2d\u6240\u6709\u952e\u503c\u5bf9\u6570\u636e\u4e86\u3002<\/p>\n<p>\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a<a class=\"a_link\" href=\"http:\/\/www.zhangxinxu.com\/study\/201310\/formdata-form-data-get.html\" target=\"_blank\">FormData\u5bf9\u8c61\u4e0e\u8868\u5355\u6570\u636e\u83b7\u53d6demo<\/a><\/p>\n<p>demo\u9875\u9762\u4e3a\u4e00\u4e2a\u666e\u901a\u7684\u767b\u5f55\u8868\u5355\uff0c\u622a\u56fe\u5982\u4e0b\uff1a<br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201310\/2013-10-11_220842.png\" width=\"527\" height=\"296\" alt=\"demo\u8868\u5355\u622a\u56fe\" class=\"alignnone\" \/><\/p>\n<p>\u70b9\u51fb\u767b\u5f55\u6267\u884cAjax\u767b\u5f55\uff0c\u4e0d\u8fc7\u8fd9\u91cc\u662f\u91c7\u7528FormData\u683c\u5f0f\u53d1\u9001\u7684\u3002<\/p>\n<p>\u76f8\u5173JS\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<div class=\"zxx_code\">\n<pre>document.querySelector(\"#formData\").addEventListener(\"submit\", function(event) {\n    var myFormData = <span style=\"color:#cd0000;\">new FormData(this)<\/span>;\n    var xhr = new XMLHttpRequest();\n    xhr.open(this.method, this.action);\n    xhr.onload = function(e) {\n        if (xhr.status == 200 && xhr.responseText) {\n            <span style=\"color:green;\">\/\/ \u663e\u793a\uff1a'\u6b22\u8fce\u4f60\uff0c' + xhr.responseText;<\/span>\n            this.reset();\n        }\n    }.bind(this);\n    <span style=\"color:green;\">\/\/ \u53d1\u9001FormData\u5bf9\u8c61\u6570\u636e<\/span>\n    xhr.send(myFormData);\n    <span style=\"color:green;\">\/\/ \u963b\u6b62\u9ed8\u8ba4\u7684\u8868\u5355\u63d0\u4ea4<\/span>\n    event.preventDefault();\n}, false);<\/pre>\n<\/div>\n<p>\u6211\u4eec\u6253\u5f00\u5de5\u5177\u67e5\u770b\u4e0b\u8bf7\u6c42\uff1a<br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201310\/2013-10-11_210758.png\" width=\"415\" height=\"308\" alt=\"firebug\u67e5\u770b\u8bf7\u6c42\" class=\"alignnone\" \/><br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201310\/2013-10-11_211055.png\" width=\"507\" height=\"232\" alt=\"Chrome\u5f00\u53d1\u8005\u5de5\u5177\u67e5\u770b\" class=\"alignnone\" \/><\/p>\n<p>\u4ee5\u4e0a\u5206\u522b\u662fFirebug\u548cChrome\u5f00\u53d1\u8005\u5de5\u5177\u67e5\u770b\u7684\u7ed3\u679c\u3002<\/p>\n<p>\u6211\u4eec\u518d\u770b\u4e0b\u4f20\u7edfAjax\u8bf7\u6c42\uff1a<br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201310\/2013-10-11_212815.png\" width=\"416\" height=\"279\" alt=\"\u4f20\u7edfAjax POST firebug\u67e5\u770b\" class=\"alignnone\" \/><br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201310\/2013-10-11_212445.png\" width=\"570\" height=\"128\" alt=\"\u4f20\u7edfAjax post Chrome\u4e0b\u67e5\u770b \u5f20\u946b\u65ed-\u946b\u7a7a\u95f4-\u946b\u751f\u6d3b\" class=\"alignnone\" \/><\/p>\n<p>\u5dee\u5f02\u8fd8\u662f\u6bd4\u8f83\u5927\u7684\u3002<br \/>\n<code>FormData<\/code>\u63d0\u4ea4\u683c\u5f0f\u7684\u6bcf\u4e2a\u6570\u636e\u5206\u4e09\u90e8\u5206\uff1a<\/p>\n<ul>\n<li>\u7b2c\u4e00\u90e8\u5206\u4e5f\u5c31\u662f\u7b2c\u4e00\u884c\uff0c\u8868\u793a\u201c\u5206\u754c\u7ebf(boundary)\u201d\uff0c\u6211\u5c1a\u672a\u6df1\u5165\u7814\u7a76\u8fd9\u4e2a\u5206\u754c\u7ebf\uff0c\u4e0d\u8fc7\uff0c\u6211\u6ca1\u4f30\u8ba1\u9519\u7684\u8bdd\uff0c\u4e8c\u8fdb\u5236\u5927\u6587\u4ef6\u5206\u9694\u4f20\u8f93\u65f6\u5019\uff0c\u5c31\u662f\u4f7f\u7528\u8fd9\u4e2a\u5206\u754c\u7ebf\u3002\u5728<code>webkit<\/code>\u6838\u5fc3\u4e2d\uff0c\u4f7f\u7528<em>&#8220;&#8212;&#8212;WebKitFormBoundary&#8221;\u52a016\u4f4d\u968f\u673aBase64\u4f4d\u7f16\u7801\u7684\u5b57\u7b26\u4e32<\/em>\u4f5c\u4e3a\u5206\u9694\u8fb9\u754c\u3002\u6839\u636eFirebug\u7684\u663e\u793a\uff0cFirefox\u4e2d\uff0c\u4f3c\u4e4e\u662f\u4f7f\u7528<em>\u5f88\u591a\u4e2a<code>\"-\"<\/code>\u52a0\u65f6\u95f4\u6233<\/em>\u8fdb\u884c\u8fb9\u754c\u5206\u9694\u7684\u3002\u8fd9\u91cc\u7684\u8fb9\u754c\u7684\u4f5c\u7528\u6bd4\u8f83\u5355\u7eaf\uff0c\u53ef\u80fd\u5c31\u662f\u628a\u8868\u5355\u7684\u8fd9\u4e24\u4e2a\u5b57\u6bb5\u4f5c\u4e3a\u4e24\u4e2a\u72ec\u7acb\u6570\u636e\u6d41\u4f20\u8f93\u3002<\/li>\n<li>\u7b2c\u4e8c\u90e8\u5206\u4e5f\u5c31\u662f\u7b2c\u4e8c\u884c\uff0c\u8868\u793a\u5185\u5bb9\u914d\u7f6e\uff0c\u8fd9\u91cc\u90fd\u662f\u7edf\u4e00\u7684<code>form-data<\/code>\uff08\u56e0\u4e3a\u662fFormData\u5bf9\u8c61\u683c\u5f0f\u63d0\u4ea4\u7684\uff09\uff0c\u7136\u540e\u7d27\u8ddf\u7740<code>name<\/code>\u952e\u503c\u3002<\/li>\n<li>\u7b2c\u4e09\u90e8\u5206\u5c31\u662f\u7b2c\u4e09\u884c\uff0c\u8868\u793a\u4f20\u8f93\u7684\u503c\u3002<\/li>\n<\/ul>\n<p>\u867d\u7136\u524d\u53f0\u4f20\u8f93\u5dee\u5f02\u8f83\u5927\uff0c\u4f46\u662f\uff0c\u540e\u53f0\u7684\u5904\u7406\u662f\u53ef\u4ee5\u4e00\u81f4\u7684\uff0c\u4f8b\u5982\uff0c\u6211\u8fd9\u91cc\u7684PHP\u4ee3\u7801\u5c31\u975e\u5e38\u7b80\u5355\uff1a<\/p>\n<div class=\"zxx_code\">\n<pre><span style=\"color:red;\">&lt;?php<\/span>\n    $username = <span style=\"color:#cd0000;\">$_POST['email']<\/span>;\n    if (isset($username) == true) {\n        echo $username;\n    } else {\n        echo '';    \n    }\n<span style=\"color:red;\">?><\/span><\/pre>\n<\/div>\n<p><code>FormData<\/code>\u5bf9\u8c61\u8fd8\u6709\u4e00\u4e2a\u65b9\u6cd5\uff0c\u4e3a<code>append()<\/code>\u65b9\u6cd5\uff0c\u53ef\u4ee5\u4eba\u4e3a\u7684\u7ed9\u5f53\u524dFormData\u5bf9\u8c61\u6dfb\u52a0\u4e00\u4e2a\u952e\/\u503c\u5bf9\u3002<\/p>\n<p>\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n<div class=\"zxx_code\">\n<pre>void append(DOMString \u952e, Blob \u503c, [\u53ef\u9009] DOMString \u6587\u4ef6\u540d);\nvoid append(DOMString \u952e, DOMString \u503c);<\/pre>\n<\/div>\n<p>\u8bed\u6cd5\u7b2c\u4e00\u884c\u51fa\u73b0\u4e86<code>Blob<\/code>, \u8fd9\u662f\u6211\u4eec\u4e0b\u9762\u8981\u4ecb\u7ecd\u7684\u5bb6\u81e3\u4e4b\u4e00\uff0c\u60a8\u53ef\u4ee5\u5148\u8bb0\u4f4f\uff0c\u8fd9\u662f\u7528\u6765\u8868\u793a\u4e8c\u8fdb\u5236\u6587\u4ef6\u7684\uff0c\u540e\u9762\u7684\u6587\u4ef6\u540d\u53ef\u9009\uff0c\u636e\u8bf4\uff0c\u5982\u679c\u7f3a\u7701\uff0c\u4e14\u4f20\u8f93\u7684\u662fBlob\u5bf9\u8c61\uff0c\u5219\u4f1a\u4f7f\u7528<code>\"blob\"<\/code>\u4ee3\u66ff\u3002<br \/>\n\u7b2c\u4e8c\u884c\u5c31\u662f\u6bd4\u8f83\u5e38\u89c4\u7684\u7528\u6cd5\uff0c<code>DOMString<\/code>\u8fd9\u4e2a\u5bb6\u81e3\u5df2\u7ecf\u4ecb\u7ecd\u4e86\uff0c\u5728JavaScript\u4e2d\u5c31\u662f\u666e\u901a\u5b57\u7b26\u4e32\u7684\u610f\u601d\u3002\u56e0\u6b64\uff0c\u6bd4\u65b9\u8bf4\u6211\u4eec\u8981\u989d\u5916\u63d0\u4ea4\u4e2a<code>token<\/code>\u503c\uff0c\u53ef\u80fd\u5c31\u662f\uff1a<\/p>\n<div class=\"zxx_code\">\n<pre>myFormData.append(\"token\", \"ce509193050ab9c2b0c518c9cb7d9556\");<\/pre>\n<\/div>\n<p>\u4e8e\u662f\uff0c\u540e\u53f0\u5c31\u53ef\u4ee5get <code>token<\/code>\u8fd9\u4e2a\u503c\u4e86\u3002<\/p>\n<p>\u5927\u5bb6\u81ea\u884c\u8865\u8111\uff0c\u6211\u5c31\u4e0d\u518d\u6491\u7bc7\u5e45\u4e86\u3002<\/p>\n<p><code>FormData<\/code>\u65e0\u6cd5\u5b57\u7b26\u4e32\u5316\uff0c\u56e0\u4e3a\uff0c\u65e0\u6cd5\u7528\u505a\u8868\u5355\u5e8f\u5217\u5316\u3002<\/p>\n<h3>\u4e94\u3001\u5bb6\u81e3\u4e4bBlob\u6570\u636e\u5bf9\u8c61<\/h3>\n<blockquote><p>\u4e00\u4e2aBlob\u5bf9\u8c61\u5c31\u662f\u4e00\u4e2a\u5305\u542b\u6709\u53ea\u8bfb\u539f\u59cb\u6570\u636e\u7684\u7c7b\u6587\u4ef6\u5bf9\u8c61\u3002Blob\u5bf9\u8c61\u4e2d\u7684\u6570\u636e\u5e76\u4e0d\u4e00\u5b9a\u5f97\u662fJavaScript\u4e2d\u7684\u539f\u751f\u5f62\u5f0f\u3002File\u63a5\u53e3\u57fa\u4e8eBlob, \u7ee7\u627f\u4e86Blob\u7684\u529f\u80fd\uff0c\u5e76\u4e14\u6269\u5c55\u652f\u6301\u4e86\u7528\u6237\u8ba1\u7b97\u673a\u4e0a\u7684\u672c\u5730\u6587\u4ef6\u3002<\/p>\n<p>\u521b\u5efaBlob\u5bf9\u8c61\u7684\u65b9\u6cd5\u6709\u51e0\u79cd\uff0c\u53ef\u4ee5\u8c03\u7528Blob\u6784\u9020\u51fd\u6570\uff0c\u8fd8\u53ef\u4ee5\u4f7f\u7528\u4e00\u4e2a\u5df2\u6709Blob\u5bf9\u8c61\u4e0a\u7684<code>slice()<\/code>\u65b9\u6cd5\u5207\u51fa\u53e6\u4e00\u4e2aBlob\u5bf9\u8c61\uff0c\u8fd8\u53ef\u4ee5\u8c03\u7528<code>canvas<\/code>\u5bf9\u8c61\u4e0a\u7684<code>toBlob<\/code>\u65b9\u6cd5\u3002<\/p><\/blockquote>\n<p>\u4ee5\u4e0a\u4e3aMDN\u4e0a\u5b98\u65b9\u53e3\u543b\u7684\u89e3\u91ca\u3002\u5b9e\u9645\u4e0a\uff0cBlob\u662f\u8ba1\u7b97\u673a\u754c\u901a\u7528\u672f\u8bed\u4e4b\u4e00\uff0c\u5168\u79f0\u5199\u4f5c\uff1aBLOB (binary large object)\uff0c\u8868\u793a\u4e8c\u8fdb\u5236\u5927\u5bf9\u8c61\u3002MySql\/Oracle\u6570\u636e\u5e93\u4e2d\uff0c\u5c31\u6709\u4e00\u79cdBlob\u7c7b\u578b\uff0c\u4e13\u95e8\u5b58\u653e\u4e8c\u8fdb\u5236\u6570\u636e\u3002<\/p>\n<p>\u5728\u5b9e\u9645Web\u5e94\u7528\u4e2d\uff0cBlob\u66f4\u591a\u662f\u56fe\u7247\u4e8c\u8fdb\u5236\u5f62\u5f0f\u7684\u4e0a\u4f20\u4e0e\u4e0b\u8f7d\uff0c\u867d\u7136\u5176\u53ef\u4ee5\u5b9e\u73b0\u51e0\u4e4e\u4efb\u610f\u6587\u4ef6\u7684\u4e8c\u8fdb\u5236\u4f20\u8f93\u3002<\/p>\n<p>\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u4f7f\u7528Blob\u4ece\u670d\u52a1\u5668\u4e0aGET\u67d0mm\u7684\u56fe\u7247\uff08\u53ea\u8981\u5173\u5fc3\u6807\u7ea2\u7684\u90e8\u5206\uff09\uff1a<\/p>\n<div class=\"zxx_code\">\n<pre>var xhr = new XMLHttpRequest();    \nxhr.open(\"get\", \"mm1.jpg\", true);\nxhr.<span style=\"color:#cd0000;\">responseType<\/span> = \"<span style=\"color:#cd0000;\">blob<\/span>\";\nxhr.onload = function() {\n    if (this.status == 200) {\n        var blob = <span style=\"color:#cd0000;\">this.response<\/span>;  <span style=\"color:green;\">\/\/ this.response\u4e5f\u5c31\u662f\u8bf7\u6c42\u7684\u8fd4\u56de\u5c31\u662fBlob\u5bf9\u8c61<\/span>\n        var img = document.createElement(\"img\");\n        img.onload = function(e) {\n          window.URL.revokeObjectURL(img.src); <span style=\"color:green;\">\/\/ \u6e05\u9664\u91ca\u653e<\/span>\n        };\n        <span style=\"color:#cd0000;\">img.src<\/span> = window.URL.createObjectURL(<span style=\"color:#cd0000;\">blob<\/span>);\n        eleAppend.appendChild(img);    \n    }\n}\nxhr.send();<\/pre>\n<\/div>\n<p>\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a<a class=\"a_link\" target=\"_blank\" href=\"http:\/\/www.zhangxinxu.com\/study\/201310\/blob-get-image-show.html\">Blob\u83b7\u53d6\u56fe\u7247\u5e76\u4e8c\u8fdb\u5236\u663e\u793ademo<\/a><\/p>\n<p>\u6211\u4eec\u67e5\u770bdemo\u9875\u9762\u8fd9\u4e2amm\u56fe\u7247\u5143\u7d20\uff0c\u4f1a\u53d1\u73b0\u5176URL\u5730\u5740\u65e2\u4e0d\u662f\u4f20\u7edfHTTP\uff0c\u4e5f\u4e0d\u662fBase64 URL\uff0c\u800c\u662fBlob\u5f62\u5f0f~\u5982\u4e0b\u622a\u56fe\u793a\u610f\uff1a<br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201310\/2013-10-12_175507.png\" width=\"602\" height=\"91\" alt=\"\u56fe\u7247blob\u5730\u5740\u793a\u610f\" class=\"alignnone\" \/><br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201310\/2013-10-12_175405.png\" width=\"592\" height=\"357\" alt=\"demo\u9875\u9762\u56fe\u7247\u7684blob\u683c\u5f0f\u7684URL\" class=\"alignnone\" \/><\/p>\n<p>\u8fd9\u5c31\u662fBlob\u5728Web\u5f00\u53d1\u4e2d\u975e\u5e38\u91cd\u8981\u7684\u4e00\u4e2a\u529f\u80fd\u2014\u2014\u521b\u5efaBlob\u7f51\u5740\u3002\u4e0a\u8ff0\u4ee3\u7801\u6d89\u53caXMLHttpRequest 2\u4e00\u4e9b\u91cd\u8981\u77e5\u8bc6\u70b9\uff0c\u4ee5\u53ca<code>window.URL<\/code>\u76f8\u5173\u6280\u672f\uff0c\u90fd\u662f\u53ef\u4ee5\u6df1\u5165\u6316\u6398\u5b66\u4e60\u7684\u90e8\u5206\uff0c\u4f46\uff0c\u4e0d\u662f\u672c\u6587\u91cd\u70b9\uff0c\u4ee5\u540e\u6709\u673a\u4f1a\u4f1a\u7ec6\u81f4\u9610\u8ff0\u3002<\/p>\n<p>\u4f46\u662f\uff0c\u5e76\u4e0d\u662f\u6240\u6709\u7684\u56fe\u7247\u90fd\u80fd\u4ee5Blob\u5f62\u5f0f\u8bf7\u6c42\uff0c\u56e0\u4e3a\uff0c\u6bd5\u7adf\u662fAjax\u8bf7\u6c42\u561b\uff0c\u8fd8\u662f\u6709\u4e00\u5b9a\u7684\u8de8\u57df\u9650\u5236\u3002<code>XMLHttpRequest 2<\/code>\u867d\u7136\u652f\u6301\u8de8\u6e90\u8d44\u6e90\u5171\u4eab(CORS)\uff0c\u4f46\u662f\uff0c\u8fd8\u662f\u9700\u8981\u5bf9<code>Access-Control-Allow-Origin<\/code>\u7684\u8bbe\u7f6e\uff0c\u5141\u8bb8\u6765\u81ea\u90a3\u4e2a\u57df\u540d\u7684\u8fd9\u7c7b\u8bf7\u6c42\uff0c\u4f8b\u5982\uff0c\u5141\u8bb8\u672c\u4eba\u7684\u7ad9\u70b9Blob\u8bf7\u6c42\u4f60\u670d\u52a1\u5668\u4e0a\u7684\u56fe\u7247\u8d44\u6e90\uff0c\u4f60\u53ef\u4ee5\u8bbe\u7f6e\uff1a<\/p>\n<div class=\"zxx_code\">\n<pre>Access-Control-Allow-Origin: http:\/\/zhangxinxu.com<\/pre>\n<\/div>\n<p>\u8981\u5141\u8bb8\u4efb\u4f55\u57df\u5411\u60a8\u63d0\u4ea4\u8bf7\u6c42\uff0c\u53ef\u4ee5\u8bbe\u7f6e\uff1a<\/p>\n<div class=\"zxx_code\">\n<pre>Access-Control-Allow-Origin: *<\/pre>\n<\/div>\n<p>\u6211\u4eec\u90fd\u77e5\u9053CSS3\u7684<code>font-face<\/code>\u5c5e\u6027\uff0c\u5728Firefox\u6d4f\u89c8\u5668\u4e0b\uff0c\u5982\u679c\u5b57\u4f53\u6587\u4ef6\u8de8\u57df\uff08\u5305\u62ec\u8de8\u5b50\u57df\uff09\uff0c\u662f\u663e\u793a\u4e0d\u51fa\u6765\u7684\uff0c\u4e5f\u662f\u901a\u8fc7<\/p>\n<div class=\"zxx_code\">\n<pre>Access-Control-Allow-Origin: *<\/pre>\n<\/div>\n<p>\u8bbe\u7f6e\u89e3\u51b3\u3002\u5176\u5b9e\uff0c\u672c\u8d28\u662f\u4e00\u6837\u7684\u3002<\/p>\n<p>\u7531\u4e8e\u6743\u9650\u539f\u56e0\uff0c\u6211\u7684\u4e2a\u4eba\u7ad9\u70b9\u65e0\u6cd5\u914d\u7f6e<code>Access-Control-Allow-Origin<\/code>\uff0c\u6211\u6d4b\u8bd5\u4e86\u4e0b\uff0c\u65b0\u6d6a\u5fae\u535a\u7684\u56fe\u7247\u662f\u65e0\u6cd5\u4e8c\u8fdb\u5236\u8bf7\u6c42\u7684\uff0c\u4e0d\u8fc7\u6211\u7684\u524d\u4e1c\u5bb6\uff0c<a href=\"http:\/\/www.xiaomishu.com\">xiaomishu.com<\/a>\u7684\u56fe\u7247\u90fd\u662f\u53ef\u4ee5Ajax\u8bf7\u6c42\u5e76Blob\u663e\u793a\u7684\uff0c\u6084\u6084\u544a\u8bc9\u5927\u5bb6\uff0c\u662f\u6211\u5f53\u521d\u52a8\u7684\u624b\u811a\uff0c(*^__^*) \u563b\u563b\u2026\u2026<\/p>\n<p><strong>\u5c5e\u6027<\/strong><br \/>\nBlob\u5bf9\u8c61\u6709\u4e24\u4e2a\u5c5e\u6027\uff0c\u53c2\u89c1\u4e0b\u8868\uff1a<\/p>\n<table class=\"params_table\" cellspacing=\"1\" width=\"100%\">\n<tbody>\n<tr>\n<th>\u5c5e\u6027\u540d<\/td>\n<th>\u7c7b\u578b<\/td>\n<th>\u63cf\u8ff0<\/td>\n<\/tr>\n<tr>\n<td><strong>size<\/strong><\/td>\n<td>unsigned long long(\u8868\u793a\u53ef\u4ee5\u5f88\u5927\u7684\u6570\u503c)<\/td>\n<td>Blob\u5bf9\u8c61\u4e2d\u6240\u5305\u542b\u6570\u636e\u7684\u5927\u5c0f\u3002\u5b57\u8282\u4e3a\u5355\u4f4d\u3002 <strong>\u53ea\u8bfb\u3002<\/strong><\/td>\n<\/tr>\n<tr>\n<td><strong>type<\/strong><\/td>\n<td>DOMString<\/td>\n<td>\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u8868\u660e\u8be5Blob\u5bf9\u8c61\u6240\u5305\u542b\u6570\u636e\u7684MIME\u7c7b\u578b\u3002\u4f8b\u5982\uff0c\u4e0ademo\u56fe\u7247MIME\u7c7b\u4f3c\u5c31\u662f&#8221;<code>image\/jpeg<\/code>&#8220;. \u5982\u679c\u7c7b\u578b\u672a\u77e5\uff0c\u5219\u8be5\u503c\u4e3a\u7a7a\u5b57\u7b26\u4e32\u3002 <strong>\u53ea\u8bfb\u3002<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u4eca\u5929\u5728\u5fae\u535a\u4e0a\u770b\u5230\u4e00\u4e2a\u8868\u5355\u63d0\u4ea4\u4e4b\u524d\u5224\u65ad\u6587\u4ef6\u5927\u5c0f\u5e76\u4f5c\u963b\u6b62\u7684tip\uff0c\u5b9e\u9645\u4e0a\uff0c\u5c31\u662f\u4f7f\u7528\u7684Blob\u5bf9\u8c61\u7684<code>size<\/code>\u5c5e\u6027\u3002<\/p>\n<p><strong>\u6784\u9020\u51fd\u6570<\/strong><br \/>\n\u4e0eFormData\u5bf9\u8c61\u7c7b\u4f3c\uff0cBlob\u4e5f\u6709\u4e00\u4e2a\u6784\u9020\u51fd\u6570\u7528\u6cd5\u3002\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n<div class=\"zxx_code\">\n<pre>Blob Blob(\n  [\u53ef\u9009] Array parts,\n  [\u53ef\u9009] BlobPropertyBag properties\n);<\/pre>\n<\/div>\n<p>\u4f8b\u5982\uff1a<\/p>\n<div class=\"zxx_code\">\n<pre>var myBlob= new Blob(arrayBuffer);<\/pre>\n<\/div>\n<p>\u5176\u4e2d\uff0c\u4e24\u4e2a\u53c2\u6570\u7684\u542b\u4e49\u662f\uff1a<\/p>\n<dl>\n<dt><code>parts<\/code><\/dt>\n<dd>\u4e00\u4e2a\u6570\u7ec4\uff0c\u5305\u542b\u4e86\u5c06\u8981\u6dfb\u52a0\u5230Blob\u5bf9\u8c61\u4e2d\u7684\u6570\u636e\u3002\u6570\u7ec4\u5143\u7d20\u53ef\u4ee5\u662f\u4efb\u610f\u591a\u4e2a\u7684ArrayBuffer, ArrayBufferView(typed array), Blob, \u6216\u8005DOMString\u5bf9\u8c61\u3002<\/dd>\n<dt><code>properties<\/code><\/dt>\n<dd>\u4e00\u4e2a\u5bf9\u8c61\uff0c\u8bbe\u7f6eBlob\u5bf9\u8c61\u7684\u4e00\u4e9b\u5c5e\u6027\u3002\u76ee\u524d\u4ec5\u652f\u6301\u4e00\u4e2a<code>type<\/code>\u5c5e\u6027\uff0c\u8868\u793aBlob\u7684\u7c7b\u578b\u3002<\/dd>\n<\/dl>\n<p><strong>\u65b9\u6cd5<\/strong><br \/>\nBlob\u5bf9\u8c61\u6709\u4e2a\u5f88\u91cd\u8981\u7684\u65b9\u6cd5-<code>slice()<\/code>\uff0c\u4f5c\u7528\u662f\uff0c\u53ef\u4ee5\u5b9e\u73b0\u6587\u4ef6\u7684\u5206\u5272\uff01<\/p>\n<p>\u8fd9\u4e2a<code>slice()<\/code>\u6709\u4e00\u6bb5\u4e0d\u582a\u56de\u9996\u7684\u5386\u53f2\uff0c\u4e0d\u8fc7\u73b0\u5728\u5927\u5bb6\u4e0d\u8981\u5173\u5fc3\u3002\u76ee\u524d\u7684<code>slice()<\/code>\u65b9\u6cd5\u5df2\u7ecf\u8ddfJS\u4e2d\u6570\u7ec4\u554a\uff0c\u5b57\u7b26\u4e32\u7684<code>slice<\/code>\u65b9\u6cd5\u7528\u6cd5\u4e00\u81f4\u4e86\u3002\u5982\u4e0b\uff1a<\/p>\n<div class=\"zxx_code\">\n<pre>Blob slice(\n  [\u53ef\u9009] long long start,\n  [\u53ef\u9009] long long end,\n  [\u53ef\u9009] DOMString contentType\n};<\/pre>\n<\/div>\n<p>\u53c2\u6570\u91ca\u4e49\uff1a<\/p>\n<dl>\n<dt><code>start<\/code><\/dt>\n<dd>\u5f00\u59cb\u7d22\u5f15\uff0c\u53ef\u4ee5\u4e3a\u8d1f\u6570\uff0c\u8bed\u6cd5\u7c7b\u4f3c\u4e8e\u6570\u7ec4\u7684<code>slice<\/code>\u65b9\u6cd5\u3002\u9ed8\u8ba4\u503c\u4e3a0.<\/dd>\n<dt><code>end<\/code><\/dt>\n<dd>\u7ed3\u675f\u7d22\u5f15\uff0c\u53ef\u4ee5\u4e3a\u8d1f\u6570\uff0c\u8bed\u6cd5\u7c7b\u4f3c\u4e8e\u6570\u7ec4\u7684<code>slice<\/code>\u65b9\u6cd5\u3002\u9ed8\u8ba4\u503c\u4e3a\u6700\u540e\u4e00\u4e2a\u7d22\u5f15\u3002<\/dd>\n<dt><code>contentType<\/code><\/dt>\n<dd>\u65b0\u7684Blob\u5bf9\u8c61\u7684MIME\u7c7b\u578b\uff0c\u8fd9\u4e2a\u503c\u5c06\u4f1a\u6210\u4e3a\u65b0\u7684Blob\u5bf9\u8c61\u7684type\u5c5e\u6027\u7684\u503c\uff0c\u9ed8\u8ba4\u4e3a\u4e00\u4e2a\u7a7a\u5b57\u7b26\u4e32\u3002<\/dd>\n<dl>\n<p>\u663e\u7136\uff0c\u6b64\u65b9\u6cd5\u8fd4\u56de\u7684\u6570\u636e\u683c\u5f0f\u8fd8\u662fBlob\u5bf9\u8c61\uff0c\u4e0d\u8fc7\u662f\u6307\u5b9a\u8303\u56f4\u590d\u5236\u7684\u65b0\u7684Blob\u5bf9\u8c61\u3002\u6ce8\u610f\uff0c\u5982\u679c<code>start<\/code>\u53c2\u6570\u7684\u503c\u6bd4\u6e90Blob\u5bf9\u8c61\u7684<code>size<\/code>\u5c5e\u6027\u503c\u8fd8\u5927\uff0c\u5219\u8fd4\u56de\u7684Blob\u5bf9\u8c61\u7684<code>size<\/code>\u503c\u4e3a<code>0<\/code>\uff0c\u4e5f\u5c31\u662f\u4e0d\u5305\u542b\u4efb\u4f55\u6570\u636e\u3002<\/p>\n<h3>\u516d\u3001\u5bb6\u81e3\u4e4bFile\u5bf9\u8c61<\/h3>\n<p>File\u987e\u540d\u601d\u610f\u5c31\u662f\u201c\u6587\u4ef6\u201d\uff0c\u901a\u5e38\u800c\u8a00\uff0c\u8868\u793a\u6211\u4eec\u4f7f\u7528<code>file<\/code>\u63a7\u4ef6(<code>&lt;input type=\"file\"&gt;<\/code>)\u9009\u62e9\u7684<a href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/API\/FileList\">FileList<\/a>\u5bf9\u8c61\uff0c\u6216\u8005\u662f\u4f7f\u7528\u62d6\u62fd\u64cd\u4f5c\u641e\u51fa\u7684<a href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/DragDrop\/DataTransfer\">DataTransfer<\/a>\u5bf9\u8c61\u3002<\/p>\n<p>\u8fd9\u91cc\u7684File\u5bf9\u8c61\u4e5f\u662f\u4e8c\u8fdb\u5236\u5bf9\u8c61\uff0c\u56e0\u6b64\uff0c\u4ece\u5c5e\u4e8eBlob\u5bf9\u8c61\uff0cBlob\u5bf9\u8c61\u7684\u4e00\u4e9b\u5c5e\u6027\u4e0e\u65b9\u6cd5\uff0cFile\u5bf9\u8c61\u540c\u6837\u9002\u5408\uff0c\u4e14\u63a8\u8350\u4f7f\u7528Blob\u5bf9\u8c61\u7684\u5c5e\u6027\u4e0e\u65b9\u6cd5\u3002<\/p>\n<p>File\u5bf9\u8c61\u81ea\u8eab\u4e5f\u6709\u4e00\u4e9b\u5c5e\u6027\u4e0e\u65b9\u6cd5\uff0c\u4f46\u662f\uff0c\u6709\u4e9b\u5df2\u7ecf\u8fc7\u65f6\u2014\u2014\u4e0d\u63a8\u8350\u4f7f\u7528\uff0c\u56e0\u6b64\uff0c\u5f53\u524d\u5f88\u591aHTML5 Ajax\u6587\u4ef6\u4e0a\u4f20\u4e0b\u8f7d\u7684\u6559\u7a0b\u4e2d\u51fa\u73b0\u662f\u5c5e\u6027\u548c\u65b9\u6cd5\u90fd\u662f\u8fc7\u65f6\u7684\uff0c\u4e0d\u8981\u76f2\u76eeCopy\uff0c\u8bf7\u5927\u5bb6\u660e\u8fa8\uff01<\/p>\n<p><strong>\u5c5e\u6027<\/strong><\/p>\n<dl>\n<dt><code>File.lastModifiedDate<\/code><span style=\"background:#333;color:#fff;font-size:12px;\">[\u53ea\u8bfb]<\/span><\/dt>\n<dd>\u6587\u4ef6\u5bf9\u8c61\u6700\u540e\u4fee\u6539\u7684\u65e5\u671f<\/dd>\n<\/dl>\n<dl>\n<dt><code>File.name<\/code><span style=\"background:#333;color:#fff;font-size:12px;\">[\u53ea\u8bfb]<\/span><\/dt>\n<dd>\u6587\u4ef6\u5bf9\u8c61\u7684\u540d\u79f0<\/dd>\n<\/dl>\n<dl>\n<dt><code>File.fileName<\/code><span style=\"background:#333;color:#fff;font-size:12px;\">[\u53ea\u8bfb]<\/span> <span style=\"background:pink;color:#000;font-size:12px;\">[\u8fc7\u65f6\u4e0d\u63a8\u8350\u4f7f\u7528]<\/span><\/dt>\n<dd>\u6587\u4ef6\u5bf9\u8c61\u7684\u540d\u79f0\uff08\u8bf7\u4f7f\u7528<code>File.name<\/code>\u4ee3\u66ff\uff09<\/dd>\n<\/dl>\n<dl>\n<dt><code>File.fileSize<\/code><span style=\"background:#333;color:#fff;font-size:12px;\">[\u53ea\u8bfb]<\/span> <span style=\"background:pink;color:#000;font-size:12px;\">[\u8fc7\u65f6\u4e0d\u63a8\u8350\u4f7f\u7528]<\/span><\/dt>\n<dd>\u6587\u4ef6\u5bf9\u8c61\u7684\u5927\u5c0f\uff08\u8bf7\u4f7f\u7528<code>Blob.size<\/code>\u4ee3\u66ff\uff09<\/dd>\n<\/dl>\n<dl>\n<dt><code>Blob.size<\/code><span style=\"background:#333;color:#fff;font-size:12px;\">[\u53ea\u8bfb]<\/span><\/dt>\n<dd>Blob\u5bf9\u8c61\u5305\u542b\u6570\u636e\u7684\u5b57\u8282\u5927\u5c0f<\/dd>\n<\/dl>\n<dl>\n<dt><code>Blob.type<\/code><span style=\"background:#333;color:#fff;font-size:12px;\">[\u53ea\u8bfb]<\/span><\/dt>\n<dd>\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u8868\u660e\u8be5Blob\u5bf9\u8c61\u6240\u5305\u542b\u6570\u636e\u7684MIME\u7c7b\u578b<\/dd>\n<\/dl>\n<p><strong>\u65b9\u6cd5<\/strong><\/p>\n<dl>\n<dt><code>File.getAsBinary()<\/code><span style=\"background:pink;color:#000;font-size:12px;\">[\u8fc7\u65f6\u4e0d\u63a8\u8350\u4f7f\u7528]<\/span><\/dt>\n<dd>\u4e8c\u8fdb\u5236\u5f62\u5f0f\u8fd4\u56de\u6587\u4ef6\u6570\u636e\uff08\u8bf7\u4f7f\u7528FileReader\u5bf9\u8c61\u7684<code>FileReader.readAsBinaryString()<\/code>\u65b9\u6cd5\u4ee3\u66ff\uff09<\/dd>\n<\/dl>\n<dl>\n<dt><code>File.getAsDataURL()<\/code><span style=\"background:pink;color:#000;font-size:12px;\">[\u8fc7\u65f6\u4e0d\u63a8\u8350\u4f7f\u7528]<\/span><\/dt>\n<dd>\u8fd4\u56de\u6587\u4ef6<code>data:URL<\/code>\u7f16\u7801\u5b57\u7b26\u4e32\u6570\u636e\uff08\u8bf7\u4f7f\u7528FileReader\u5bf9\u8c61\u7684<code>FileReader.readAsDataURL()<\/code>\u65b9\u6cd5\u4ee3\u66ff\uff09<\/dd>\n<\/dl>\n<dl>\n<dt><code>File.getAsText(string encoding)<\/code><span style=\"background:pink;color:#000;font-size:12px;\">[\u8fc7\u65f6\u4e0d\u63a8\u8350\u4f7f\u7528]<\/span><\/dt>\n<dd>\u4ee5\u7ed9\u5b9a\u7684\u5b57\u7b26\u4e32\u7f16\u7801\u8fd4\u56de\u6587\u4ef6\u6570\u636e\u89e3\u91ca\u540e\u7684\u6587\u672c\uff08\u8bf7\u4f7f\u7528FileReader\u5bf9\u8c61\u7684<code>FileReader.readAsText()<\/code>\u65b9\u6cd5\u4ee3\u66ff\uff09<\/dd>\n<\/dl>\n<dl>\n<dt><code>Blob.size<\/code><span style=\"background:#333;color:#fff;font-size:12px;\">[\u53ea\u8bfb]<\/span><\/dt>\n<dd>Blob\u5bf9\u8c61\u5305\u542b\u6570\u636e\u7684\u5b57\u8282\u5927\u5c0f<\/dd>\n<\/dl>\n<dl>\n<dt><code>Blob.type<\/code><span style=\"background:#333;color:#fff;font-size:12px;\">[\u53ea\u8bfb]<\/span><\/dt>\n<dd>\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u8868\u660e\u8be5Blob\u5bf9\u8c61\u6240\u5305\u542b\u6570\u636e\u7684MIME\u7c7b\u578b\u3002<\/dd>\n<\/dl>\n<p>\u4e0a\u9762\u6709\u63d0\u5230<code>FileReader<\/code>\u5bf9\u8c61\uff0c\u8fd9\u8d27\u662f\u76f8\u5f53\u7684\u6709\u8d27\uff0c\u4e4b\u524d\u6709\u4eba\u66fe\u95ee\u6211\uff0c\u5982\u4f55\u5c06\u56fe\u7247\u8f6c\u6362\u6210<code>Data base64 url<\/code>\u683c\u5f0f\uff0c\u5176\u4e2d\u4e00\u4e2a\u65b9\u6cd5\u5c31\u662f<code>FileReader.readAsDataURL()<\/code>\u65b9\u6cd5\uff08\u8fd8\u6709\u5c31\u662f<code>canvas<\/code>\u5143\u7d20\u7684<code>toDataURL()<\/code>\u548c<code>toDataURLHD()<\/code>\u65b9\u6cd5\uff09\uff0c\u7136\u4e0e\u672c\u6587\u4e3b\u65e8\u65e0\u5173\uff0c\u6682\u4e0d\u8d58\u8ff0\uff1b\u5982\u60a8\u6709\u5174\u8da3\uff0c\u9875\u9762\u5e95\u90e8\u6709\u5176\u76f8\u5173\u77e5\u8bc6\u70b9\u94fe\u63a5\uff0c\u53ef\u81ea\u884c\u6982\u89c8\u3002<\/p>\n<h3>\u4e03\u3001\u5bb6\u81e3\u4e4bArrayBuffer\u5bf9\u8c61<\/h3>\n<p><span class=\"s\">\/\/zxx:ArrayBuffer\u5bf9\u8c61\u7275\u626f\u77e5\u8bc6\u70b9\u975e\u5e38\u591a\uff0c\u8fd9\u91cc\u4ec5\u63a5\u89e6\u808c\u80a4\uff0c\u6df1\u5165\u63a5\u89e6\u4e0b\u6b21\u4f1a\u4e13\u95e8\u518d\u8bf4\u4e0b\u3002<\/span><\/p>\n<p>\u5f88\u672f\u8bed\u7684\u89e3\u91ca\u6709\uff1a<\/p>\n<blockquote><p>ArrayBuffer\u8868\u793a\u4e8c\u8fdb\u5236\u6570\u636e\u7684\u539f\u59cb\u7f13\u51b2\u533a\uff0c\u8be5\u7f13\u51b2\u533a\u7528\u4e8e\u5b58\u50a8\u5404\u79cd\u7c7b\u578b\u5316\u6570\u7ec4\u7684\u6570\u636e\u3002<\/p><\/blockquote>\n<blockquote><p>ArrayBuffer\u662f\u4e8c\u8fdb\u5236\u6570\u636e\u901a\u7528\u7684\u56fa\u5b9a\u957f\u5ea6\u5bb9\u5668\u3002<\/p><\/blockquote>\n<p>\u6240\u8c13\u672f\u8bed\uff0c\u5c31\u662f\u5c0f\u767d\u770b\u4e0d\u61c2\u7684\u89e3\u91ca\u8bed\u3002\u6211\u518d\u7528\u901a\u4fd7\u8bed\u89e3\u91ca\u4e0b\uff0c\u5e0c\u671b\u5927\u5bb6\u53ef\u4ee5\u6709\u70b9\u611f\u6027\u7684\u8ba4\u8bc6\uff1a<\/p>\n<p>\u672f\u8bed\u4e2d\uff0c\u63d0\u5230\u201c\u4e8c\u8fdb\u5236\u201d\uff0c\u6211\u4eec\u8111\u4e2d\u5e94\u8be5\u4f1a\u51fa\u73b0<code>01010111<\/code>\u4e4b\u7c7b\uff1b\u63d0\u5230\u201c\u7f13\u51b2\u201d\uff0c\u4f1a\u8054\u60f3\u5230\u5728\u7ebf\u89c6\u9891\u63d0\u524d\u52a0\u8f7d\u4e00\u90e8\u5206\u89c6\u9891\u7684\u90a3\u4e2a\u7f13\u51b2\u3002\u4f46\u662f\uff0c\u4e24\u4e2a\u5408\u8d77\u6765\uff0c\u201c\u4e8c\u8fdb\u5236\u6570\u636e\u7f13\u51b2\u533a\u201d\uff0c\u8111\u8865\u5c31\u4e0d\u8fde\u8d2f\u4e86\uff0c\u7126\u8651\u4ea7\u751f~~<\/p>\n<p>\u73b0\u5728\uff0c\u542c\u6211\u7684\uff0c\u4e0a\u9762\u6982\u5ff5\u5168\u90e8\u6254\u6389\u3002\u6240\u8c13<code>ArrayBuffer<\/code>\u5c31\u662f\u4e2a\u88c5\u77402\u8fdb\u5236\u6570\u636e\u7684\u5bf9\u8c61\u3002\u6216\u8005\u60f3\u8c61\u6210\u5e26\u4e86\u4e2a\u540d\u53eb\u201c\u7f13\u51b2\u201d\u5e3d\u5b50\u7684\u4e8c\u8fdb\u5236\u6570\u636e\u3002\u7136\u540e\u76f4\u63a5\u5173\u8054\uff1a<code>ArrayBuffer \uff1d 2\u8fdb\u5236<\/code>\u3002<\/p>\n<p>\u4e0a\u9762<code>\uff1d<\/code>\u8868\u793a\u5173\u8054\uff0c\u4e0d\u662f\u76f8\u7b49\uff0c\u8bf8\u4f4d\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u6211\u4eec\u8bbe\u7f6eAjax\u8bf7\u6c42\u7684<code>responseType<\/code>\u4e3a&#8221;<code>arraybuffer<\/code>&#8220;\uff0c\u6211\u4eec\u53bb\u8bf7\u6c42\u67d0mm\u56fe\u7247\uff0c\u8fd4\u56de\u7684<code>response<\/code>\u5c31\u662f<code>ArrayBuffer<\/code>\uff0c\u5c31\u662f\u4e2a\u4e8c\u8fdb\u5236\u5bf9\u8c61\u3002\u4ec0\u4e48\u7f13\u51b2\u4e0d\u7f13\u51b2\u7684\uff0c\u5343\u4e07\u522b\u8865\u8111\u8fd9\u4e2a\u3002<\/p>\n<p>\u5982\u679c\u8fd8\u89c9\u5f97\u6982\u5ff5\u62bd\u8c61\uff0c\u53ef\u4ee5\u770b\u4e0b\u9762\u7684\u5177\u4f53\u8ba4\u77e5\uff1a<br \/>\n\u5927\u5bb6\u53ef\u80fd\u73a9\u8fc7\u795e\u5668\u7f16\u8f91\u5668Sublime Text, \u6211\u4eec\u968f\u4fbf\u627e\u5f20\u56fe\u7247\u62d6\u8fdb\u53bb\uff0c\u4f1a\u53d1\u73b0\u662f\u7c7b\u4f3c\u4e0b\u9762\u8fd9\u6837\u5b50\u7684\u4ee3\u7801\uff1a<br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201310\/2013-10-13_214229.png\" width=\"432\" height=\"360\" alt=\"Sublime Text\u56fe\u724716\u8fdb\u5236\u7f16\u7801\u663e\u793a\" class=\"alignnone\" \/><\/p>\n<p>Sublime Text\u4ee516\u8fdb\u5236\u7684\u5f62\u5f0f\u663e\u793a\u56fe\u7247\u8d44\u6e90\uff0c<code>ArrayBuffer<\/code>\u7684\u5dee\u522b\u5728\u4e8e\u662f\u4e8c\u8fdb\u5236\uff0c\u56e0\u6b64\uff0c\u6211\u4eec\u53ef\u4ee5\u628a<code>ArrayBuffer<\/code>\u7684\u5f62\u4f53\u8111\u8865\u6210\u2014\u2014\u4e0a\u56fe\u7684\u6570\u5b57\u5168\u662f\u7684<code>0101 1000 1101<\/code>\u4e4b\u7c7b\u7684\u3002Get it\u5426\uff1f<\/p>\n<p>\u4e0a\u9762\u63d0\u5230\u7684Blob\u5bf9\u8c61\u4e5f\u662f\u4e8c\u8fdb\u5236\uff0c\u90a3<code>Blob<\/code>\u548c<code>ArrayBuffer<\/code>\u6709\u5565\u533a\u522b\u5462\uff1f<\/p>\n<p><code>Blob<\/code>\u53ef\u4ee5<code>append<\/code> <code>ArrayBuffer<\/code>\u6570\u636e\uff0c\u4e5f\u5c31\u662fBlob\u662f\u4e2a\u66f4\u9ad8\u4e00\u7ea7\u7684\u5927\u5206\u7c7b\uff0c\u7c7b\u4f3c\u9886\u5bfc\u7684\u611f\u89c9\u3002<code>ArrayBuffer<\/code>\u5219\u662f\u5177\u6709\u67d0\u79cd\u6076\u9b54\u679c\u5b9e\u7684\u5c16\u5175\u3002<\/p>\n<p><code>ArrayBuffer<\/code>\u5b58\u5728\u7684\u610f\u4e49\u5c31\u662f\u4f5c\u4e3a\u6570\u636e\u6e90\u63d0\u524d\u5199\u5165\u5728\u5185\u5b58\u4e2d\uff0c\u5c31\u662f\u63d0\u524d\u9489\u6b7b\u5728\u67d0\u4e2a\u533a\u57df\uff0c\u957f\u5ea6\u4e5f\u56fa\u5b9a\uff0c\u4e07\u5e74\u4e0d\u53d8\u3002\u4e8e\u662f\uff0c\u5f53\u6211\u4eec\u8981\u5904\u7406\u8fd9\u4e2a<code>ArrayBuffer<\/code>\u4e2d\u7684\u4e8c\u8fdb\u5236\u6570\u636e\uff0c\u4f8b\u5982\uff0c\u5206\u522b8\u4f4d\uff0c16\u4f4d\uff0c32\u4f4d\u8f6c\u6362\u4e00\u904d\uff0c\u8fd9\u4e2a\u6570\u636e\u90fd\u4e0d\u4f1a\u53d8\u5316\uff0c3\u79cd\u8f6c\u6362\u5171\u4eab\u6570\u636e\u3002<\/p>\n<p>So\uff0c<code>ArrayBuffer<\/code>\u5c31\u662f\u7f13\u51b2\u51fa\u6765\u7684\u6253\u6b7b\u4e0d\u52a8\u7684\u4e8c\u8fdb\u5236\u5bf9\u8c61\u3002<\/p>\n<p>\u6ce8\u610f\uff0c<code>ArrayBuffer<\/code>\u672c\u8eab\u662f\u4e0d\u80fd\u8bfb\u5199\u7684\uff0c\u9700\u8981\u501f\u52a9\u7c7b\u578b\u5316\u6570\u7ec4\u6216<code>DataView<\/code>\u5bf9\u8c61\u6765\u89e3\u91ca\u539f\u59cb\u7f13\u51b2\u533a\uff08\u5bb0\u5272\u539f\u59cb\u4e8c\u8fdb\u5236\u6570\u636e\uff09\u3002<\/p>\n<p><strong>\u7c7b\u578b\u5316\u6570\u7ec4<\/strong><br \/>\n\u7c7b\u578b\u5316\u6570\u7ec4(Typed Arrays)\u662fJavaScript\u4e2d\u65b0\u51fa\u73b0\u7684\u4e00\u4e2a\u6982\u5ff5\uff0c\u4e13\u4e3a\u8bbf\u95ee\u539f\u59cb\u7684\u4e8c\u8fdb\u5236\u6570\u636e\u800c\u751f\u3002<\/p>\n<p>\u7c7b\u578b\u6570\u7ec4\u7684\u7c7b\u578b\u6709\uff1a<\/p>\n<table border=\"0\" cellspacing=\"1\" cellpadding=\"0\" class=\"params_table\" width=\"400\">\n<tbody>\n<tr>\n<th>\u540d\u79f0<\/th>\n<th>\u5927\u5c0f (\u4ee5\u5b57\u8282\u4e3a\u5355\u4f4d)<\/th>\n<th>\u8bf4\u660e<\/th>\n<\/tr>\n<tr>\n<td valign=\"top\">\n<p align=\"left\"><strong>Int8Array<\/strong><\/p>\n<\/td>\n<td valign=\"top\">\n<p align=\"left\">1<\/p>\n<\/td>\n<td valign=\"top\">\n<p align=\"left\">8\u4f4d\u6709\u7b26\u53f7\u6574\u6570<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\">\n<p align=\"left\"><strong>Uint8Array<\/strong><\/p>\n<\/td>\n<td valign=\"top\">\n<p align=\"left\">1<\/p>\n<\/td>\n<td valign=\"top\">\n<p align=\"left\">8\u4f4d\u65e0\u7b26\u53f7\u6574\u6570<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\">\n<p align=\"left\"><strong>Int16Array<\/strong><\/p>\n<\/td>\n<td valign=\"top\">\n<p align=\"left\">2<\/p>\n<\/td>\n<td valign=\"top\">\n<p align=\"left\">16\u4f4d\u6709\u7b26\u53f7\u6574\u6570<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\">\n<p align=\"left\"><strong>Uint16Array<\/strong><\/p>\n<\/td>\n<td valign=\"top\">\n<p align=\"left\">2<\/p>\n<\/td>\n<td valign=\"top\">\n<p align=\"left\">16\u4f4d\u65e0\u7b26\u53f7\u6574\u6570<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\">\n<p align=\"left\"><strong>Int32Array<\/strong><\/p>\n<\/td>\n<td valign=\"top\">\n<p align=\"left\">4<\/p>\n<\/td>\n<td valign=\"top\">\n<p align=\"left\">32\u4f4d\u6709\u7b26\u53f7\u6574\u6570<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\">\n<p align=\"left\"><strong>Uint32Array<\/strong><\/p>\n<\/td>\n<td valign=\"top\">\n<p align=\"left\">4<\/p>\n<\/td>\n<td valign=\"top\">\n<p align=\"left\">32\u4f4d\u65e0\u7b26\u53f7\u6574\u6570<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\">\n<p align=\"left\"><strong>Float32Array<\/strong><\/p>\n<\/td>\n<td valign=\"top\">\n<p align=\"left\">4<\/p>\n<\/td>\n<td valign=\"top\">\n<p align=\"left\">32\u4f4d\u6d6e\u70b9\u6570<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\">\n<p align=\"left\"><strong>Float64Array<\/strong><\/p>\n<\/td>\n<td valign=\"top\">\n<p align=\"left\">8<\/p>\n<\/td>\n<td valign=\"top\">\n<p align=\"left\">64\u4f4d\u6d6e\u70b9\u6570<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u672c\u8d28\u4e0a\uff0c\u7c7b\u578b\u5316\u6570\u7ec4\u548cArrayBuffer\u662f\u4e00\u6837\u7684\u3002\u4e0d\u8fc7\u4e00\u4e2a\u53ef\u8bfb\u5199\uff08\u8131\u6389buffer\u9650\u5236\uff09\uff0c\u4e00\u4e2a\u5f53\u6570\u636e\u6e90\u7684\u547d\u3002<\/p>\n<p>\u4e3e\u4e00\u4e9b\u4ee3\u7801\u4f8b\u5b50\uff0c\u770b\u770b\u672c\u8d28\u4e00\u81f4\u5728\u4f55\u5904\uff1a<\/p>\n<div class=\"zxx_code\">\n<pre><span style=\"color:green;\">\/\/ \u521b\u5efa\u4e00\u4e2a8\u5b57\u8282\u7684ArrayBuffer  <\/span>\nvar b = new ArrayBuffer(8);  \n  \n<span style=\"color:green;\">\/\/ \u521b\u5efa\u4e00\u4e2a\u6307\u5411b\u7684\u89c6\u56fev1\uff0c\u91c7\u7528Int32\u7c7b\u578b\uff0c\u5f00\u59cb\u4e8e\u9ed8\u8ba4\u7684\u5b57\u8282\u7d22\u5f150\uff0c\u76f4\u5230\u7f13\u51b2\u533a\u7684\u672b\u5c3e <\/span> \nvar v1 = new Int32Array(b);  \n  \n<span style=\"color:green;\">\/\/ \u521b\u5efa\u4e00\u4e2a\u6307\u5411b\u7684\u89c6\u56fev2\uff0c\u91c7\u7528Uint8\u7c7b\u578b\uff0c\u5f00\u59cb\u4e8e\u5b57\u8282\u7d22\u5f152\uff0c\u76f4\u5230\u7f13\u51b2\u533a\u7684\u672b\u5c3e  <\/span>\nvar v2 = new Uint8Array(b, 2);  \n  \n<span style=\"color:green;\">\/\/ \u521b\u5efa\u4e00\u4e2a\u6307\u5411b\u7684\u89c6\u56fev3\uff0c\u91c7\u7528Int16\u7c7b\u578b\uff0c\u5f00\u59cb\u4e8e\u5b57\u8282\u7d22\u5f152\uff0c\u957f\u5ea6\u4e3a2<\/span>  \nvar v3 = new Int16Array(b, 2, 2);  <\/pre>\n<\/div>\n<p>\u4e0a\u9762\u4ee3\u7801\u91cc\u53d8\u91cf\u7684\u6570\u636e\u7ed3\u6784\u5982\u4e0b\u8868\u6240\u793a\uff1a<\/p>\n<table width=\"400\" border=\"0\" cellspacing=\"1\" class=\"params_table\">\n<tr>\n<th scope=\"col\">\u53d8\u91cf<\/th>\n<th colspan=\"8\" scope=\"col\">\u7d22\u5f15<\/th>\n<\/tr>\n<tr align=\"center\">\n<td align=\"center\">&nbsp;<\/td>\n<td colspan=\"8\" align=\"center\">\u5b57\u8282\uff08\u4e0d\u53ef\u7d22\u5f15\uff09<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">b=<\/td>\n<td align=\"center\">0<\/td>\n<td align=\"center\">1<\/td>\n<td align=\"center\">2<\/td>\n<td align=\"center\">3<\/td>\n<td align=\"center\">4<\/td>\n<td align=\"center\">5<\/td>\n<td align=\"center\">6<\/td>\n<td align=\"center\">7<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">&nbsp;<\/td>\n<td colspan=\"8\" align=\"center\">\u7c7b\u578b\u6570\u7ec4<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">v1=<\/td>\n<td colspan=\"4\" align=\"center\">0<\/td>\n<td colspan=\"4\" align=\"center\">1<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">v2=<\/td>\n<td align=\"center\" bgcolor=\"#999999\" style=\"background-color:#999;\">&nbsp;<\/td>\n<td align=\"center\" bgcolor=\"#999999\" style=\"background-color:#999;\">&nbsp;<\/td>\n<td align=\"center\">0<\/td>\n<td align=\"center\">1<\/td>\n<td align=\"center\">2<\/td>\n<td align=\"center\">3<\/td>\n<td align=\"center\">4<\/td>\n<td align=\"center\">5<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">v3=<\/td>\n<td align=\"center\" bgcolor=\"#999999\" style=\"background-color:#999;\">&nbsp;<\/td>\n<td align=\"center\" bgcolor=\"#999999\" style=\"background-color:#999;\">&nbsp;<\/td>\n<td colspan=\"2\" align=\"center\">0<\/td>\n<td colspan=\"2\" align=\"center\">1<\/td>\n<td align=\"center\" bgcolor=\"#999999\" style=\"background-color:#999;\">&nbsp;<\/td>\n<td align=\"center\" bgcolor=\"#999999\" style=\"background-color:#999;\">&nbsp;<\/td>\n<\/tr>\n<\/table>\n<p>\u7531\u4e8e\u7c7b\u578b\u5316\u6570\u7ec4\u76f4\u63a5\u8bbf\u95ee\u56fa\u5b9a\u5185\u5b58\uff0c\u56e0\u6b64\uff0c\u901f\u5ea6\u5f88\u8d5e\uff0c\u6bd4\u4f20\u7edf\u6570\u7ec4\u8981\u5feb\uff01\u56e0\u4e3a\u666e\u901aJavascript\u6570\u7ec4\u4f7f\u7528\u7684\u662fHash\u67e5\u627e\u65b9\u5f0f\u3002\u540c\u65f6\uff0c\u7c7b\u578b\u5316\u6570\u7ec4\u5929\u751f\u5904\u7406\u4e8c\u8fdb\u5236\u6570\u636e\uff0c\u8fd9\u5bf9\u4e8eXMLHttpRequest 2\u3001canvas\u3001webGL\u7b49\u6280\u672f\u6709\u7740\u5148\u5929\u7684\u4f18\u52bf\u3002<\/p>\n<p><strong>DataView\u5bf9\u8c61<\/strong><br \/>\nDataView\u5bf9\u8c61\u5728\u53ef\u4ee5\u5728<code>ArrayBuffer<\/code>\u4e2d\u7684\u4efb\u4f55\u4f4d\u7f6e\u8bfb\u53d6\u548c\u5199\u5165\u4e0d\u540c\u7c7b\u578b\u7684\u4e8c\u8fdb\u5236\u6570\u636e\u3002<\/p>\n<p>\u7528\u6cd5\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n<div class=\"zxx_code\">\n<pre>var dataView = new DataView(DataView(buffer, byteOffset[\u53ef\u9009], byteLength[\u53ef\u9009]);<\/pre>\n<\/div>\n<p>\u5176\u4e2d\uff0c<code>buffer<\/code>\u8868\u793aArrayBuffer\uff1b<code>byteOffset<\/code>\u6307\u7f13\u51b2\u533a\u5f00\u59cb\u5904\u7684\u504f\u79fb\u91cf\uff08\u4ee5\u5b57\u8282\u4e3a\u5355\u4f4d\uff09\uff1b<code>byteLength<\/code>\u6307\u7f13\u51b2\u533a\u90e8\u5206\u7684\u957f\u5ea6\uff08\u4ee5\u5b57\u8282\u4e3a\u5355\u4f4d\uff09\u3002<\/p>\n<p><strong>\u5c5e\u6027<\/strong><\/p>\n<dl>\n<dt><code>buffer<\/code><\/dt>\n<dd>\u8868\u793aArrayBuffer<\/dd>\n<\/dl>\n<dl>\n<dt><code>byteOffset<\/code><\/dt>\n<dd>\u6307\u7f13\u51b2\u533a\u5f00\u59cb\u5904\u7684\u504f\u79fb\u91cf<\/dd>\n<\/dl>\n<dl>\n<dt><code>byteLength<\/code><\/dt>\n<dd>\u6307\u7f13\u51b2\u533a\u90e8\u5206\u7684\u957f\u5ea6<\/dd>\n<\/dl>\n<p>\u65b9\u6cd5\u6709\u5f88\u591a\uff0c\u5b9e\u9645\u4e0a\uff0c\u662f\u6709\u89c4\u5f8b\u7684\uff0c\u7bc7\u5e45\u539f\u56e0\uff0c\u4e5f\u4e0d\u662f\u91cd\u70b9\uff0c\u5c31\u5355\u7eaf\u9732\u4e2a\u8138\uff1a<br \/>\n<code>getInt8<\/code>, <code>getUint8<\/code>, <code>getInt16<\/code>, <code>getUint16<\/code>, <code>getInt32<\/code>, <code>getUint32<\/code>, <code>getFloat32<\/code>, <code>getFloat64<\/code>, <code>setInt8<\/code>, <code>setUint8<\/code>, <code>setInt16<\/code>, <code>setUint16<\/code>, <code>setInt32<\/code>, <code>setUint32<\/code>, <code>setFloat32<\/code>, <code>setFloat64<\/code>.<\/p>\n<p>\u4e0b\u9762\u56de\u5230<strong>ArrayBuffer\u5bf9\u8c61<\/strong>\uff0c<code>ArrayBuffer<\/code>\u5bf9\u8c61\u81ea\u8eab\u4e5f\u53ef\u4ee5\u6784\u9020\uff0c\u8ddf\u4e0a\u9762\u7684FormData, Blob\u5bf9\u8c61\u7c7b\u4f3c\uff0c\u4f8b\u5982\uff1a<\/p>\n<div class=\"zxx_code\">\n<pre>var buf = new ArrayBuffer(32);<\/pre>\n<\/div>\n<p>\u8bed\u6cd5\u4e3a\uff1a<\/p>\n<div class=\"zxx_code\">\n<pre>ArrayBuffer ArrayBuffer(length[\u53ef\u4ee5\u5f88\u5927\u6570\u503c]);<\/pre>\n<\/div>\n<p>\u6211\u4eec\u5728\u63a7\u5236\u53f0\u8fd0\u884c\u4e0b<code>new ArrayBuffer(32)<\/code>\uff0c\u770b\u770b\u7ed3\u679c\uff1a<br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201310\/2013-10-14_002230.png\" width=\"411\" height=\"140\" alt=\"ArrayBuffer\u7684\u5c5e\u6027\u548c\u65b9\u6cd5 \u5f20\u946b\u65ed-\u946b\u7a7a\u95f4-\u946b\u751f\u6d3b\" class=\"alignnone\" \/><\/p>\n<p>\u53ef\u4ee5\u770b\u5230\uff0c\u5176\u6709\u4e00\u4e2a<code>byteLength<\/code>\u5c5e\u6027\uff0c\u8868\u793a<code>ArrayBuffer<\/code>\u7684\u957f\u5ea6\uff0c\u4e5f\u53ef\u4ee5\u8bf4\u662f\u5927\u5c0f\uff1b\u8fd8\u6709\u4e00\u4e2a<code>slice<\/code>\u65b9\u6cd5\uff0c\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n<div class=\"zxx_code\">\n<pre>ArrayBuffer slice(\n  begin\n  end[\u53ef\u9009]\n);<\/pre>\n<\/div>\n<p><code>begin<\/code>\u8868\u793a\u8d77\u59cb\uff0c<code>end<\/code>\u8868\u793a\u7ed3\u675f\u70b9\u3002\u636e\u8bf4\uff0cInternet Explorer 10 \u4ee5\u53caiOS6-\u662f\u6ca1\u6709\u8be5\u65b9\u6cd5\u7684\u3002<\/p>\n<p>\u7efc\u4e0a\uff0c\u4e3e\u4e2aArrayBuffer\u7684\u5b9e\u4f8b\u5427\uff0c\u53d1\u9001\u4f7f\u7528XMLhttpRequest\u53d1\u9001ArrayBuffer\u6570\u636e\uff1a<\/p>\n<div class=\"zxx_code\">\n<pre>function sendArrayBuffer() {\n  var xhr = new XMLHttpRequest();\n  xhr.open('POST', '\/server', true);\n  xhr.onload = function(e) { ... };\n\n  var uInt8Array = new Uint8Array([1, 2, 3]);\n\n  xhr.send(uInt8Array.buffer);\n}<\/pre>\n<\/div>\n<p>\u4f7f\u7528\u4e86\u7c7b\u578b\u5316\u6570\u7ec4\uff0c\u53d1\u9001\u7684\u662f\u7c7b\u578b\u5316\u6570\u7ec4(uInt8Array)\u7684<code>buffer<\/code>\u5c5e\u6027\uff0c\u4e5f\u5c31\u662fArrayBuffer\u5bf9\u8c61\u3002<\/p>\n<p>over~<\/p>\n<h3>\u516b\u3001\u7ed3\u675f\u8bed<\/h3>\n<p>\u65b0\u6280\u672f\u5c42\u51fa\u4e0d\u7a77\uff0c\u6211\u89c9\u5f97\u5427\uff0c\u4ee5\u540e\uff0c\u884c\u4e1a\u7684\u5206\u652f\u53ef\u80fd\u8981\u66f4\u7ec6\u4e86\u3002\u6bd4\u65b9\u8bf4JS\u5f00\u53d1\u5427\uff0c\u53ef\u80fd\u5c31\u6709JS UI\u4ea4\u4e92\u5f00\u53d1\u5de5\u7a0b\u5e08\uff1bJS Web\u5f00\u53d1\u5de5\u7a0b\u5e08\u3002\u56e0\u4e3a\uff0c\u4e00\u4e2a\u4eba\u60f3\u8981\u5b8c\u5168hold\u4f4f\u8fd9\u4e48\u591a\u7684\u77e5\u8bc6\u70b9\uff0c\u8fd8\u771f\u4e0d\u662f\u4e00\u822c\u4eba\u80fd\u505a\u5230\u7684\u3002<\/p>\n<p>\u521a\u5f00\u59cb\u5199\u7684\u65f6\u5019\uff0c\u8fd8\u60f3\u6700\u540e\u4e3e\u4e2a\u6587\u4ef6\u5206\u5272\u4e0a\u4f20\u7684\u4f8b\u5b50\uff0c\u53ea\u53ef\u60dc\u5185\u5bb9\u5b9e\u5728\u592a\u591a\uff0c\u52a0\u4e0a\u53bb\u4e5f\u4f1a\u88ab\u6e6e\u6ca1\uff0c\u4e8e\u662f\u4f5c\u7f62\uff0c\u51b3\u5b9a\u6709\u673a\u4f1a\uff0c\u4e13\u95e8\u8bb2\u4e0b\u8fd9\u4e2a\u3002\u8fd8\u6709<code>FileReader<\/code>\u53ef\u4ee5\u72ec\u7acb\u8bb2\u4e00\u4e0b\uff0c\u8fd8\u6709\u7c7b\u578b\u5316\u6570\u7ec4\u4e5f\u53ef\u4ee5\u4e13\u95e8\u8bb2\u4e00\u4e0b\u7b49\u3002 <\/p>\n<p>\u5b66\u8def\u6f2b\u6f2b\uff0c\u4efb\u91cd\u9053\u8fdc\u3002\u6587\u4e2d\u82e5\u6709\u81f4\u547d\u7684\u7ed3\u8bba\u9519\u8bef\u6216\u758f\u5ffd\u7684\u6587\u5b57\u4e66\u5199\u9519\u8bef\uff0c\u90fd\u6b22\u8fce\u6307\u6b63\uff0c\u4e0d\u751a\u611f\u8c22\u3002\u6b22\u8fce\u8ba8\u8bba\uff0c\u6b22\u8fce\u4ea4\u6d41\uff01<\/p>\n<p><strong>\u53c2\u8003\u94fe\u63a5<\/strong><\/p>\n<ul>\n<li>https:\/\/developer.mozilla.org\/zh-CN\/docs\/DOM\/DOMString<\/li>\n<li>https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/API\/document<\/li>\n<li>https:\/\/developer.mozilla.org\/zh-CN\/docs\/DOM\/XMLHttpRequest\/FormData<\/li>\n<li>https:\/\/developer.mozilla.org\/zh-CN\/docs\/DOM\/Blob<\/li>\n<li>https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/API\/File<\/li>\n<li>https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/API\/FileReader<\/li>\n<li>http:\/\/technet.microsoft.com\/zh-cn\/ie\/br212474<\/li>\n<li>https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/API\/ArrayBuffer<\/li>\n<li>http:\/\/blog.csdn.net\/hfahe\/article\/details\/7421203<\/li>\n<\/ul>\n<p>\u672c\u6587\u4e3a\u539f\u521b\u6587\u7ae0\uff0c\u8f6c\u8f7d\u8bf7\u6ce8\u660e\u6765\u81ea<a href=\"http:\/\/www.zhangxinxu.com\/\">\u5f20\u946b\u65ed-\u946b\u7a7a\u95f4-\u946b\u751f\u6d3b<\/a>[<a href=\"http:\/\/www.zhangxinxu.com\/\">http:\/\/www.zhangxinxu.com<\/a>]<br \/>\n\u672c\u6587\u5730\u5740\uff1a<a href=\"http:\/\/www.zhangxinxu.com\/wordpress\/?p=3725\">http:\/\/www.zhangxinxu.com\/wordpress\/?p=3725<\/a><\/p>\n<p>\uff08\u672c\u7bc7\u5b8c\uff09<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6211\u5927\u5b66\u90a3\u4f1a\u513f\uff0c\u4e00\u4e2a\u79f0\u4e3aAjax\u7684\u4e1c\u897f\u5bf9\u524d\u7aef\u884c\u4e1a\u9020\u6210\u4e86\u6df1\u8fdc\u5f71\u54cd\uff0c\u4e0d\u4ec5\u662fJS\u8bed\u8a00\uff0c\u800c\u5305\u62ec\u524d\u7aef\u5730\u4f4d\u3001\u804c\u4f4d\u5174\u8d77\u4ee5\u53ca\u5de5\u4f5c\u5206\u5de5\u7b49\u3002\u629b\u5f00IE6\u6d4f\u89c8\u5668\u4e0d\u8c08\uff0c\u5176\u4ed6\u6d4f\u89c8\u5668\u7684Ajax\u5b9e\u9645\u4e0a\u90fd\u662f\u501f\u52a9XMLHttpRequest\u5b9e\u73b0\u7684\u3002 \u7136\u540e\uff0c\u597d\u591a\u5e74\u8fc7\u53bb\u4e86\uff0cXMLHttpRequest\u5e26\u7740\u4e24\u4f4d\u5bb6\u81e3\uff0cDOMString\u548cDocument\u6570\u636e\u7c7b\u578b\u653b\u57ce\u7565\u5730\uff0c\u51e0\u4e4e\u4e00\u7edf\u5929\u4e0b\u3002 \u7136\u65f6\u4ee3\u662f\u53d1\u5c55\u7684\uff0c\u4eba\u4eec\u7fa4\u4f17\u7684\u9700\u6c42\u662f\u65fa\u76db\u7684\uff0cHTML5\u72b9\u5982\u5189\u5189\u5347\u8d77\u7684\u65b0\u661f\u5f00\u59cb\u666e\u7167\u5927\u5730\uff0c\u6069\u6cfd\u5927\u4f17\u3002XMLHttpRequest\u7531\u4e8e\u5c31\u4e24\u4e2a\u5bb6\u81e3DOMString\u548cDocument\uff0c\u4e14\u5e76\u4e0d\u662f100%\u542c\u8bdd\u3002\u56e0\u6b64\uff0c\u5176\u5df2\u7ecf\u5f00\u59cbhold\u4e0d\u4f4fHTML5\u7684\u8000\u773c\u5149\u8292\u4e86\u3002\u4e3a\u4e86\u987a\u5e94\u65f6\u4ee3\u7684\u6f6e\u6d41\uff0cXMLHttpRequest\u51f9\u51f8\u66fc\u53d8\u8eab\u5347\u7ea7\u52302.0\uff0c\u53d8\u5316\u8bf8\u591a\uff0c\u5176\u4e2d\u4e00\u4e2a\u5f88\u91cd\u8981\u7684\u53d8\u5316\u5c31\u662f\u5e7f\u62db\u5bb6\u81e3\uff0c\u6269\u5f20\u5b9e\u529b\uff0c\u4e0eHTML5\u4e00\u8d77\u5b8c\u6210\u5343\u79cb\u4e07\u8f7d\u4e4b\u5927\u4e1a\u3002 \u8fd9\u4e9b\u5bb6\u81e3\u6709\u2026\u2026<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[874,872,870,869,873,871,875],"_links":{"self":[{"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/posts\/3725"}],"collection":[{"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/comments?post=3725"}],"version-history":[{"count":0,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/posts\/3725\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/media?parent=3725"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/categories?post=3725"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/tags?post=3725"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}