{"id":6386,"date":"2017-09-10T20:35:04","date_gmt":"2017-09-10T12:35:04","guid":{"rendered":"http:\/\/www.zhangxinxu.com\/wordpress\/?p=6386"},"modified":"2017-09-10T20:37:51","modified_gmt":"2017-09-10T12:37:51","slug":"html5-canvas-video-barrage","status":"publish","type":"post","link":"https:\/\/www.zhangxinxu.com\/wordpress\/2017\/09\/html5-canvas-video-barrage\/","title":{"rendered":"\u4f7f\u7528canvas\u5b9e\u73b0\u548cHTML5 video\u4ea4\u4e92\u7684\u5f39\u5e55\u6548\u679c"},"content":{"rendered":"<p>by <a href=\"http:\/\/www.zhangxinxu.com\/\">zhangxinxu<\/a> from <a href=\"http:\/\/www.zhangxinxu.com\/wordpress\/?p=6386\">http:\/\/www.zhangxinxu.com\/wordpress\/?p=6386<\/a><br \/>\n\u672c\u6587\u53ef\u5168\u6587\u8f6c\u8f7d\uff0c\u4f46\u9700\u5f97\u5230\u539f\u4f5c\u8005\u4e66\u9762\u8bb8\u53ef\uff0c\u540c\u65f6\u4fdd\u7559\u539f\u4f5c\u8005\u548c\u51fa\u5904\uff0c\u6458\u8981\u5f15\u6d41\u5219\u968f\u610f\u3002<\/p>\n<h3>\u4e00\u3001canvas\u5b9e\u73b0\u5f39\u5e55\u6027\u80fd\u8f83\u597d<\/h3>\n<p>\u4ece\u6280\u672f\u5b9e\u73b0\u6210\u672c\u89d2\u5ea6\u8bb2\uff0c\u8981\u5b9e\u73b0\u5f39\u5e55\u6548\u679c\uff0c\u6700\u7b80\u5355\u7684\u65b9\u6cd5\u5c31\u662fDOM+CSS3\u63a7\u5236\uff0c\u5982\u679c\u6211\u4eec\u7684\u5f39\u5e55\u6548\u679c\u6bd4\u8f83\u7b80\u5355\uff0c\u4f7f\u7528CSS3\u52a8\u753b\u5b9e\u73b0\u4e5f\u4e0d\u5931\u4e3a\u4e00\u4e2a\u597d\u7684\u65b9\u6cd5\u3002<\/p>\n<p>\u4f46\u662f\u5982\u679c\u6211\u4eec\u7684\u5f39\u5e55\u6570\u636e\u91cf\u6bd4\u8f83\u5927\uff0c\u5c31\u50cf\u4e0b\u9762\u8fd9\u79cd\uff1a<br \/>\n<img src='http:\/\/image.zhangxinxu.com\/image\/blog\/201709\/diancipao-min.jpg' width=\"400\" height=\"249\" alt=\"\u8d85\u7136\u5f39\u5e55\" class=\"alignnone\" \/><\/p>\n<p>\u4f7f\u7528DOM\u6765\u5b9e\u73b0\u5f88\u5bb9\u6613\u5361\u6210\u4e8680\u5e74\u4ee3\u7684\u62d6\u62c9\u673a\u2014\u2014\u4e00\u987f\u4e00\u987f\u7684\u3002<\/p>\n<p>\u5f88\u663e\u7136\uff0c\u9762\u5bf9\u8fd9\u79cd\u591a\u5143\u7d20\u7684\u590d\u6742\u52a8\u753b\uff0c\u4f7f\u7528<code>canvas<\/code>\u5b9e\u73b0\u662f\u66f4\u52a0\u5408\u9002\u7684\uff0c\u52a8\u753b\u4f1a\u6d41\u7545\u5f88\u591a\u3002<\/p>\n<p>\u672c\u6587\u5c31\u5c06\u5c55\u793a\u4e24\u4e2a\u6848\u4f8b\uff0c\u4f7f\u7528<code>canvas<\/code>\u5b9e\u73b0\u5f39\u5e55\u6548\u679c\u3002\u5176\u4e2d\u4e00\u4e2a\u6548\u679c\u662f\u9759\u6001\u7684\u5f39\u5e55\u6570\u636e\u56fa\u5b9a\u7684\u65e0\u9650\u5faa\u73af\u7684\u6548\u679c\uff0c\u9002\u5408\u5728\u4e2a\u4eba\u535a\u5ba2\u6216\u8005\u8fd0\u8425\u9875\u9762\uff0c\u8fd9\u79cd\u975e\u89c6\u9891\u573a\u666f\u4f7f\u7528\uff1b\u53e6\u5916\u4e00\u4e2a\u6548\u679c\u662f\u52a8\u6001\u7684\u5f39\u5e55\u6570\u636e\u53ef\u53d8\u7684\u548c\u771f\u5b9eHTML5 <code>&lt;video&gt;<\/code>\u4ea4\u4e92\u7684\u5f39\u5e55\u6548\u679c\uff0c\u4e5f\u5c31\u662f\u771f\u89c6\u9891\u5f39\u5e55\u6548\u679c\u3002<\/p>\n<p>\u4e24\u4e2a\u9ad8\u4fdd\u771fdemo\u7684\u6e90\u4ee3\u7801\u90fd\u662f\u53ef\u4ee5\u514d\u8d39\u4f7f\u7528\u7684\uff0c\u4f7f\u7528MIT\u8bb8\u53ef\uff0c\u4e5f\u5c31\u662f\u9700\u8981\u4fdd\u7559\u6e90\u4ee3\u7801\u4e2d\u7684\u7248\u6743\u58f0\u660e\u3002<\/p>\n<p>\u597d\uff0c\u4e0b\u9762\u6211\u4eec\u4e00\u4e2a\u4eba\u6765\u770b\u4e00\u4e0b\u3002<\/p>\n<h3>\u4e8c\u3001HTML5 canvas\u5b9e\u73b0\u7684\u9759\u6001\u5faa\u73af\u6eda\u52a8\u64ad\u653e\u5f39\u5e55<\/h3>\n<p>\u5148\u770b\u6548\u679c\uff0c\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a<a href=\"http:\/\/www.zhangxinxu.com\/study\/201709\/canvas-barrage-static-loop-demo.html\" target=\"_blank\">HTML5 canvas\u5b9e\u73b0\u7684\u9759\u6001\u5faa\u73af\u5f39\u5e55demo<\/a><\/p>\n<p>\u6548\u679c\u622a\u56fe\u5982\u4e0b\uff1a<br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201709\/2017-09-10_183500.png\" width=\"595\" height=\"355\" alt=\"\u9759\u6001\u5faa\u73af\u5f39\u5e55\u622a\u56fe\" class=\"alignnone\" \/><\/p>\n<p>\u76f8\u5173JS\u4ee3\u7801\u76f4\u63a5\u67e5\u770b\u9875\u9762\u6e90\u4ee3\u7801\u5c31\u53ef\u4ee5\u770b\u5230\u4e86\u3002<\/p>\n<p><strong>\u4f7f\u7528\u65b9\u6cd5\u548cAPI<\/strong><\/p>\n<p>\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre>canvasBarrage(canvas, data);<\/pre>\n<p>\u5176\u4e2d\uff1a<\/p>\n<dl>\n<dt><strong>canvas<\/strong><\/dt>\n<dd><code>canvas<\/code>\u8868\u793a\u6211\u4eec\u7684<code>&lt;canvas&gt;<\/code>\u753b\u5e03\u5143\u7d20\uff0c\u53ef\u4ee5\u76f4\u63a5\u662fDOM\u5143\u7d20\uff0c\u4e5f\u53ef\u4ee5\u662f<code>&lt;canvas&gt;<\/code>\u753b\u5e03\u5143\u7d20\u7684\u9009\u62e9\u5668\u3002<\/dd>\n<dt><strong>data<\/strong><\/dt>\n<dd><code>data<\/code>\u8868\u793a\u5f39\u5e55\u6570\u636e\uff0c\u662f\u4e00\u4e2a\u6570\u7ec4\u3002\u4f8b\u5982\u4e0b\u9762\uff1a<\/p>\n<pre>[{\n    value: '\u5f39\u5e551',\n    color: 'blue',\n    range: [0, 0.5]\n}, {\n    value: '\u5f39\u5e552',\n    color: 'red',\n    range: [0.5, 1]\n}]<\/pre>\n<p>\u53ef\u4ee5\u770b\u5230\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e00\u4e2a\u503c\u8868\u793a\u4e00\u4e2a\u5f39\u5e55\u7684\u4fe1\u606f\u5bf9\u8c61\u3002\u5176\u4e2d<code>value<\/code>\u8868\u793a\u5f39\u5e55\u7684\u6587\u5b57\u5185\u5bb9\uff1b<code>color<\/code>\u8868\u793a\u5f39\u5e55\u63cf\u8fb9\u7684\u989c\u8272\uff08\u5f39\u5e55\u6587\u5b57\u672c\u8eab\u9ed8\u8ba4\u662f\u767d\u8272\uff09\uff1b<code>range<\/code>\u8868\u793a\u5f39\u5e55\u5728\u753b\u5e03\u4e2d\u7684\u533a\u57df\u8303\u56f4\uff0c\u4f8b\u5982<code>[0, 0.5]<\/code>\u8868\u793a\u5f39\u5e55\u5728\u753b\u5e03\u4e2d\u7684\u4e0a\u534a\u533a\u57df\u663e\u793a\uff0c<code>[0.5, 1]<\/code>\u8868\u793a\u5f39\u5e55\u5728\u753b\u5e03\u4e2d\u7684\u4e0b\u534a\u533a\u57df\u663e\u793a\u3002\n<\/dd>\n<\/dl>\n<p>\u7136\u540e\u5c31\u53ef\u4ee5\u770b\u5230\u65e0\u9650\u6eda\u52a8\u7684\u5f39\u5e55\u6548\u679c\u4e86\u3002<\/p>\n<p><strong>\u8865\u5145\u8bf4\u660e\uff1a<\/strong><\/p>\n<ul>\n<li>\u6b64\u5f39\u5e55\u6548\u679c\u9ed8\u8ba4\u6587\u5b57\u5927\u5c0f\u662f<code>28px<\/code>\uff0c\u5e76\u4e14\u6587\u5b57\u52a0\u7c97\uff0c\u5982\u679c\u8fd9\u4e2a\u6548\u679c\u4e0d\u7b26\u5408\u60a8\u7684\u9700\u6c42\uff0c\u9700\u8981\u5728<code>canvasBarrage()<\/code>\u65b9\u6cd5\u4e2d\u4fee\u6539\u6e90\u4ee3\u7801\u3002\u56e0\u4e3a\u672c\u6765\u5c31\u662f\u4e2a\u7b80\u5355\u9759\u6001\u6548\u679c\uff0c\u56e0\u6b64\u6ca1\u6709\u4e13\u95e8\u8bbe\u8ba1\u6210API\u3002<\/li>\n<li>\u6b64\u5f39\u5e55\u6548\u679c\u9ed8\u8ba4\u662f\u767d\u8272\u6587\u5b57\u52a0\u53ef\u53d8\u989c\u8272\u63cf\u8fb9\uff0c\u540c\u6837\u7684\uff0c\u5982\u679c\u8fd9\u4e2a\u6548\u679c\u4e0d\u7b26\u5408\u60a8\u7684\u9700\u6c42\uff0c\u9700\u8981\u5728<code>canvasBarrage()<\/code>\u65b9\u6cd5\u4e2d\u4fee\u6539\u6e90\u4ee3\u7801\u3002<\/li>\n<li>\u8ddf\u771f\u5b9e\u7684\u5f39\u5e55\u6548\u679c\u6709\u6240\u4e0d\u540c\uff0c\u8fd9\u91cc\u7684\u5f39\u5e55\u51fa\u73b0\u7684\u901f\u5ea6\u548c\u65f6\u673a\u4e0d\u662f\u57fa\u4e8e\u7279\u5b9a\u65f6\u95f4\uff0c\u800c\u662f\u968f\u673a\u4ea7\u751f\u3002\u6240\u4ee5\u770b\u5230\u6709\u4e9b\u6587\u5b57\u597d\u50cf\u5f00\u98de\u673a\uff0c\u800c\u6709\u4e9b\u6587\u5b57\u597d\u50cf\u5750\u7740\u62d6\u62c9\u673a\u3002\u56e0\u4e3a\u662f\u6b7b\u6570\u636e\uff0c\u8fd9\u6837\u8bbe\u8ba1\u4f1a\u770b\u4e0a\u53bb\u66f4\u771f\u5b9e\u5199\u3002<\/li>\n<\/ul>\n<h3>\u4e09\u3001canvas\u5b9e\u73b0\u7684\u548cHTML5 video\u771f\u5b9e\u4ea4\u4e92\u7684\u5f39\u5e55<\/h3>\n<p>\u8fd9\u4e2a\u539f\u578b\u5c31\u6709\u70b9\u5389\u5bb3\u4e86\uff0c\u5e02\u9762\u4e0a\u4f30\u8ba1\u5f88\u96be\u627e\u5230\u8fd9\u4e48\u8d1f\u8d23\u4efb\u7684\u539f\u578b\u9875\u9762\u4e86\u3002\u5b9e\u73b0\u7684\u52a8\u673a\u5b8c\u5168\u5174\u8da3\u4f7f\u7136\uff0c\u4e0a\u9762\u5b9e\u73b0\u4e86\u4e2a\u7b80\u5355\u7684\uff0c\u5c31\u60f3\u7740\u8981\u4e0d\u5b9e\u73b0\u4e00\u4e2a\u771f\u5b9e\u7684\uff0c\u4e07\u4e00\u4ee5\u540e\u7528\u5f97\u5230\u5462\uff1f<\/p>\n<p>\u5148\u6765\u770b\u6548\u679c\uff0c\u60a8\u53ef\u4ee5\u72e0\u72e0\u7684\u70b9\u51fb\u8fd9\u91cc\uff1a<a href=\"http:\/\/www.zhangxinxu.com\/study\/201709\/canvas-barrage-video-demo.html\" target=\"_blank\">HTML5 canvas\u548cmp4\u89c6\u9891\u771f\u5b9e\u4ea4\u4e92\u5f39\u5e55demo<\/a><\/p>\n<p>\u9875\u9762\u6548\u679c\u622a\u56fe\u5982\u4e0b\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201709\/2017-09-10_190435.png\" width=\"678\" height=\"665\" alt=\"\u548c\u89c6\u9891\u4ea4\u4e92\u7684\u5f39\u5e55\u6548\u679c\u622a\u56fe\" class=\"alignnone\" \/><\/p>\n<p>\u53ef\u4ee5\u770b\u5230\uff1a<\/p>\n<ol>\n<li>\u4e3a\u4e86\u65b9\u4fbf\u6f14\u793a\uff0c\u6211\u7279\u610f\u5f55\u5236\u4e86\u4e00\u4e2a21\u79d2\u7684\u89c6\u9891\uff1b<\/li>\n<li>\u53ef\u4ee5\u5b9e\u65f6\u66f4\u6539\u5f39\u5e55\u7684\u900f\u660e\u5ea6\u5b57\u53f7\u5927\u5c0f\u4f4d\u7f6e\u7b49\uff1b<\/li>\n<li>\u53ef\u4ee5\u5b9e\u65f6\u53d1\u9001\u5f39\u5e55\u5e76\u663e\u793a\u3002<\/li>\n<\/ol>\n<p><strong>\u90e8\u5206\u6f14\u793a\u5982\u4e0b\uff1a<\/strong><\/p>\n<p>\u70b9\u51fb\u64ad\u653e\u6309\u94ae\uff1a<br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201709\/2017-09-10_190727.png\" width=\"188\" height=\"138\" alt=\"\u70b9\u51fb\u64ad\u653e\u6309\u94ae\" class=\"alignnone\" \/><\/p>\n<p>1\u79d2\u540e\uff0c\u6b64\u65f6\u53ef\u4ee5\u770b\u5230\u5f39\u5e55\u5448\u73b0\uff0c2\u79d2\u540e\u6709\u5f39\u5e55\u8fdb\u5165\uff1a<br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201709\/2017-09-10_190958.png\" width=\"649\" height=\"391\" alt=\"\u5f39\u5e55\u5f00\u59cb\u8fdb\u5165\" class=\"alignnone\" \/><\/p>\n<p><!-- \u6682\u505c\u89c6\u9891\uff0c\u5219\u5f39\u5e55\u8fd0\u52a8\u4e5f\u505c\u6b62\uff1a\n<img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201709\/2017-09-10_191110.png\" width=\"322\" height=\"194\" alt=\"\u5f39\u5e55\u8fd0\u52a8\u505c\u6b62\" class=\"alignnone\" \/>\n\n\u4fee\u6539\u5b57\u53f7\u4e3a<code>32px<\/code>\uff0c\u7136\u540e\u65b0\u51fa\u73b0\u7684\u5f39\u5e55\u5b57\u53f7\u53d1\u751f\u4e86\u53d8\u5316\uff1a\n<img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201709\/2017-09-10_191429.png\" width=\"336\" height=\"243\" alt=\"\u5f39\u5e55\u6587\u5b57\u5927\u5c0f\u8bbe\u7f6e\" class=\"alignnone\" \/> --><\/p>\n<p>\u8bbe\u7f6e\u4f4d\u7f6e\u5c45\u5e95\u663e\u793a\u540e\uff1a<br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201709\/2017-09-10_192052.png\" width=\"670\" height=\"393\" alt=\"\u5f39\u5e55\u5c45\u5e95\u663e\u793a\" class=\"alignnone\" \/><\/p>\n<p>\u4e5f\u53ef\u4ee5\u53d1\u9001\u5f39\u5e55\uff1a<br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201709\/2017-09-10_192240.png\" width=\"473\" height=\"132\" alt=\"\u70b9\u51fb\u53d1\u9001\u6309\u94ae\u622a\u56fe\u793a\u610f\" class=\"alignnone\" \/><br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201709\/2017-09-10_192320.png\" width=\"559\" height=\"189\" alt=\"\u53d1\u9001\u7684\u5f39\u5e55\u663e\u793a\u7684\u6548\u679c\" class=\"alignnone\" \/><\/p>\n<p><strong>\u4f7f\u7528\u65b9\u6cd5\u548cAPI<\/strong><\/p>\n<p>\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre>new CanvasBarrage(canvas, video, options);<\/pre>\n<p>\u5176\u4e2d\uff1a<\/p>\n<dl>\n<dt><strong>canvas<\/strong><\/dt>\n<dd><code>canvas<\/code>\u8868\u793a\u6211\u4eec\u7684<code>&lt;canvas&gt;<\/code>\u753b\u5e03\u5143\u7d20\uff0c\u53ea\u80fd\u662fDOM\u5143\u7d20\u3002<\/dd>\n<dt><strong>video<\/strong><\/dt>\n<dd><code>video<\/code>\u8868\u793a\u6211\u4eec\u64ad\u653e\u7684\u89c6\u9891\u5143\u7d20\uff0c\u53ea\u80fd\u662fDOM\u5143\u7d20\u3002<\/dd>\n<dt><strong>options<\/strong><\/dt>\n<dd><code>options<\/code>\u4e3a\u53ef\u9009\u53c2\u6570\uff0c\u5305\u62ec\uff1a<\/p>\n<table width=\"100%\" border=\"0\" cellspacing=\"1\" cellpadding=\"0\" class=\"params_table\">\n<tbody>\n<tr>\n<th scope=\"col\">API\u540d\u79f0<\/th>\n<th scope=\"col\">\u9ed8\u8ba4\u503c<\/th>\n<th scope=\"col\">\u7b80\u5355\u91ca\u4e49<\/th>\n<\/tr>\n<tr>\n<td>opacity<\/td>\n<td>100<\/td>\n<td>\u5f39\u5e55\u900f\u660e\u5ea6\u3002\u6570\u503c\u3002<code>0<\/code>\u8868\u793a\u5b8c\u5168\u900f\u660e\uff0c<code>100<\/code>\u8868\u793a\u5b8c\u5168\u4e0d\u900f\u660e\u3002<\/td>\n<\/tr>\n<tr>\n<td>fontSize<\/td>\n<td>24<\/td>\n<td>\u5f39\u5e55\u6587\u5b57\u5927\u5c0f\u3002\u6570\u503c\u3002\u5355\u4f4d<code>px<\/code>\u3002<\/td>\n<\/tr>\n<tr>\n<td>speed<\/td>\n<td>2<\/td>\n<td>\u5f39\u5e55\u79fb\u52a8\u901f\u5ea6\u3002\u6570\u503c\u3002\u5355\u4f4d<code>px<\/code>\u3002\u5982\u679c\u8bbe\u7f6e\u4e3a<code>0<\/code>\uff0c\u5219\u8868\u793a\u5f39\u5e55\u4e0d\u79fb\u52a8\uff0c\u76f4\u63a5\u89c6\u9891\u4e2d\u95f4\u533a\u57df\u663e\u793a\u3002<\/td>\n<\/tr>\n<tr>\n<td>range<\/td>\n<td>[0,1]<\/td>\n<td>\u5f39\u5e55\u663e\u793a\u7684\u5782\u76f4\u8303\u56f4\u3002\u6570\u7ec4\u3002\u652f\u6301\u4e24\u4e2a\u503c\u3002<code>[0,1]<\/code>\u8868\u793a\u5f39\u5e55\u6574\u4e2a\u968f\u673a\u5206\u5e03\uff0c<code>[0,0.5]<\/code>\u8868\u793a\u53ea\u5728\u4e0a\u534a\u533a\u57df\u968f\u673a\u5206\u5e03\uff0c<code>[0.5,1]<\/code>\u8868\u793a\u53ea\u5728\u4e0b\u534a\u533a\u57df\u968f\u673a\u5206\u5e03\u3002<\/td>\n<\/tr>\n<tr>\n<td>color<\/td>\n<td>white<\/td>\n<td>\u6587\u5b57\u989c\u8272\u3002\u5b57\u7b26\u4e32\u3002\u989c\u8272\u503c\uff0c\u53ef\u4ee5\u662f\u5173\u952e\u5b57\uff0c\u4e5f\u53ef\u4ee5\u662f16\u8fdb\u5236\u989c\u8272\u8868\u793a\uff0c\u4f8b\u5982<code>#ff9000<\/code>\u7b49\u3002<\/td>\n<\/tr>\n<tr>\n<td>data<\/td>\n<td>[]<\/td>\n<td>\u5f39\u5e55\u6570\u636e\u3002\u6570\u7ec4\u3002\u6570\u7ec4\u4e2d\u7684\u503c\u53ea\u80fd\u662f\u4e00\u4e2a\u4e00\u4e2a\u7684\u5f39\u5e55\u6570\u636e\u5bf9\u8c61\uff0c\u4f8b\u5982\uff1a<\/p>\n<pre>[{\n    value: '\u5f39\u5e551',\n    time: 1\n}, {\n    value: '\u5f39\u5e552',\n    time: 2\n}]<\/pre>\n<p><code>value<\/code>\u548c<code>time<\/code>\u662f\u5fc5\u987b\u7684\uff0c\u5206\u5e03\u8868\u793a\u5f39\u5e55\u5185\u5bb9\uff0c\u548c\u5f39\u5e55\u5728\u89c6\u9891\u64ad\u653e\u5230\u4ec0\u4e48\u65f6\u5019\u663e\u793a\uff08\u5355\u4f4d\u662f\u79d2\uff09\u3002\u5176\u4ed6\u53ef\u9009\u53c2\u6570\u5305\u62ec<code>options<\/code>\u53c2\u6570\u4e2d\u9664<code>data<\/code>\u4ee5\u5916\u7684\u6240\u6709\u53c2\u6570\uff0c\u7528\u6765\u8986\u76d6\u5168\u5c40\u8bbe\u7f6e\uff0c\u4f8b\u5982\uff1a<\/p>\n<pre>[{\n    value: '\u5f39\u5e55',\n    time: 1,\n    color: 'red'\n}]<\/pre>\n<p>\u6b64\u65f6\u201c\u5f39\u5e55\u201d\u8fd9\u4e2a\u6587\u5b57\u7684\u989c\u8272\u5c31\u4e0d\u662f\u9ed8\u8ba4\u7684\u767d\u8272\uff0c\u800c\u662f\u8fd9\u91cc\u8bbe\u7f6e\u7684\u7ea2\u8272\u3002\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/dd>\n<\/dl>\n<p><strong>\u5982\u4f55\u4fee\u6539\u5168\u5c40\u8bbe\u7f6e\u548c\u6dfb\u52a0\u5f39\u5e55\uff1f<\/strong><\/p>\n<p>\u5f53\u6211\u4eec\u4f7f\u7528<code>new CanvasBarrage()<\/code>\u6784\u9020\u5b8c\u6211\u4eec\u7684\u5f39\u5e55\u65b9\u6cd5\u540e\uff0c\u4f1a\u8fd4\u56de\u4e00\u4e2a\u5f39\u5e55\u5bf9\u8c61\uff0c\u901a\u8fc7\u8c03\u7528\u8fd9\u4e2a\u5bf9\u8c61\u66b4\u9732\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\uff0c\u5c31\u53ef\u4ee5\u8fdb\u884c\u5168\u5c40\u7684\u8bbe\u7f6e\u548c\u6dfb\u52a0\u5f39\u5e55\u7b49\u3002\u4f8b\u5982\uff1a<\/p>\n<pre>var myBarrage = new CanvasBarrage(canvas, video, options);<\/pre>\n<p>\u5982\u679c\u6211\u4eec\u60f3\u628a\u5f39\u5e55\u900f\u660e\u5ea6\u6539\u6210<code>50%<\/code>\u900f\u660e\uff0c\u53ef\u4ee5\uff1a<\/p>\n<pre>myBarrage.opacity = 50;<\/pre>\n<p>\u5c31\u8fd9\u4e48\u7b80\u5355\uff0c\u4e8e\u662f\u65b0\u51fa\u73b0\u7684\u5f39\u5e55\u90fd\u4f1a\u4ee5<code>50%<\/code>\u900f\u660e\u663e\u793a\uff0c\u7c7b\u4f3c\u7684\uff0c\u5f39\u5e55\u6587\u5b57\u5927\u5c0f\u548c\u989c\u8272\uff0c\u5f39\u5e55\u663e\u793a\u7684\u533a\u57df\u8303\u56f4\u90fd\u53ef\u4ee5\u901a\u8fc7\u8fd9\u6837\u8bbe\u7f6e\uff0c\u4f8b\u5982\uff1a<\/p>\n<pre>myBarrage.fontSize = 20;<\/pre>\n<p>\u5c31\u662f\u628a\u5f39\u5e55\u6587\u5b57\u989c\u8272\u6539\u6210<code>20px<\/code>\u5927\u5c0f\u3002<\/p>\n<p>\u5982\u679c\u6211\u4eec\u60f3\u52a8\u6001\u6dfb\u52a0\u5f39\u5e55\uff0c\u53ef\u4ee5\u4f7f\u7528\u66b4\u9732\u7684<code>add()<\/code>\u65b9\u6cd5\uff0c\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre>myBarrage.add(obj);<\/pre>\n<p>\u5176\u4e2d<code>obj<\/code>\u7684\u53c2\u6570\u7c7b\u578b\u548c\u652f\u6301\u5c5e\u6027\u548c<code>options-data<\/code>\u6570\u7ec4\u4e2d\u5bf9\u8c61\u4e00\u6a21\u4e00\u6837\u3002\u4f8b\u5982\uff1a<\/p>\n<pre>myBarrage.add({\n    value: 'new CanvasBarrage()',\n    color: '#ff0000',\n    time: 0\n});<\/pre>\n<p>\u7ed3\u679c\u5c31\u662f\u4e0b\u9762\u7684\u6548\u679c\uff1a<br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201709\/2017-09-10_192320.png\" width=\"559\" height=\"189\" alt=\"\u53d1\u9001\u7684\u5f39\u5e55\u663e\u793a\u7684\u6548\u679c\" class=\"alignnone\" \/><\/p>\n<p><code>myBarrage<\/code>\u8fd8\u66b4\u9732\u4e86\u4e00\u4e2a\u540d\u4e3a<code>reset()<\/code>\u65b9\u6cd5\uff0c\u53ef\u4ee5\u6e05\u9664\u5c4f\u5e55\u4e0a\u6240\u6709\u7684\u5f39\u5e55\uff0c\u5e76\u91cd\u65b0\u6839\u636e\u89c6\u9891\u65f6\u95f4\u5f00\u59cb\u8fd0\u52a8\u4e0e\u663e\u793a\u3002\u89c6\u9891\u70b9\u51fb\u8df3\u8f6c\u65f6\u5019\u7684\u5f39\u5e55\u5904\u7406\u5c31\u662f\u8c03\u7528\u7684\u6b64\u65b9\u6cd5\u3002<\/p>\n<p><strong>\u8865\u5145\u8bf4\u660e<\/strong><\/p>\n<ul>\n<li>\u4ee5\u4e0a\u6f14\u793a\u7684\u5168\u90e8\u4ea4\u4e92\u6548\u679c\u548c\u8bed\u6cd5\u8bf4\u660e\u5728<a href=\"http:\/\/www.zhangxinxu.com\/study\/201709\/canvas-barrage-video-demo.html\" target=\"_blank\">demo\u9875\u9762<\/a>\u7684\u6e90\u4ee3\u7801\u4e2d\u5747\u6709\u793a\u610f\u3002<\/li>\n<li><code>CanvasBarrage<\/code>\u5b9e\u4f8b\u65b9\u6cd5\u6211\u5df2\u7ecf\u4e13\u95e8\u632a\u5230\u4e00\u4e2a\u540d\u4e3a<a href=\"http:\/\/www.zhangxinxu.com\/study\/201709\/canvasBarrage.js\" target=\"_blank\">canvasBarrage.js<\/a>\u4e2d\u3002<\/li>\n<li>\u6700\u540e\uff0c\u518d\u6b21\u660e\u786e\u4e0b\uff0c\u4fdd\u7559JS\u4e2d\u7684\u7248\u6743\u58f0\u660e\uff0c\u4e07\u4e00\u56de\u5934\u8fd9\u4e2aJS\u5347\u7ea7\u4e86\u6216\u8005\u4fee\u590d\u4e86\u67d0\u4e9b\u95ee\u9898\uff0c\u4f60\u8fd8\u53ef\u4ee5\u6eaf\u6e90\u3002<\/li>\n<li>\u611f\u8c22LuLu UI\u5bf9\u672cdemo\u63d0\u4f9b\u7684\u4ea4\u4e92\u7ec4\u4ef6\u652f\u6301\u3002<\/li>\n<\/ul>\n<h3>\u56db\u3001\u7ed3\u675f\u8bed<\/h3>\n<p>\u6211\u7279\u610f\u770b\u4e86\u4e0b\u771f\u5b9e\u7684\u89c6\u9891\u7f51\u7ad9\u7684HTML5 video\u89c6\u9891\u662f\u5982\u4f55\u5904\u7406\u5f39\u5e55\u6548\u679c\u7684\uff0c\u4f8b\u5982\u817e\u8baf\u89c6\u9891\uff0c\u53d1\u73b0\u662f\u57fa\u4e8eDOM\u5b9e\u73b0\u7684\uff08JS+DOM\uff09\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201709\/2017-09-10_201640.png\" width=\"407\" height=\"334\" alt=\"DOM\u5b9e\u73b0\u7684\u5f39\u5e55\u6548\u679c\" class=\"alignnone\" \/><\/p>\n<p>\u7136\u540eB\u7ad9\u4e5f\u662f\u57fa\u4e8eDOM\u5b9e\u73b0\u7684\uff0c\u4e5f\u5c31\u662f\u4e00\u5f00\u59cb\u6211\u6240\u8bf4\u7684DOM+CSS3\u5b9e\u73b0\uff1a<br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201709\/2017-09-10_202053.png\" width=\"383\" height=\"294\" alt=\"b\u7ad9\u5f39\u5e55\u57fa\u4e8eDOM\u5b9e\u73b0\" class=\"alignnone\" \/><\/p>\n<p>\u7136\u540e\u6211\u9677\u5165\u4e86\u6df1\u6df1\u7684\u6c89\u601d\u2026\u2026<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/emtion\/think-2.gif\" width=\"150\" height=\"150\" alt=\"\u601d\u8003\" class=\"alignnone\" \/><\/p>\n<p>\u672c\u6587\u4e3a\u539f\u521b\u6587\u7ae0\uff0c\u4f1a\u7ecf\u5e38\u66f4\u65b0\u77e5\u8bc6\u70b9\u4ee5\u53ca\u4fee\u6b63\u4e00\u4e9b\u9519\u8bef\uff0c\u56e0\u6b64\u8f6c\u8f7d\u8bf7\u4fdd\u7559\u539f\u51fa\u5904\uff0c\u65b9\u4fbf\u6eaf\u6e90\uff0c\u907f\u514d\u9648\u65e7\u9519\u8bef\u77e5\u8bc6\u7684\u8bef\u5bfc\uff0c\u540c\u65f6\u6709\u66f4\u597d\u7684\u9605\u8bfb\u4f53\u9a8c\u3002<br \/>\n\u672c\u6587\u5730\u5740\uff1a<a href=\"http:\/\/www.zhangxinxu.com\/wordpress\/?p=6386\">http:\/\/www.zhangxinxu.com\/wordpress\/?p=6386<\/a><\/p>\n<p>\uff08\u672c\u7bc7\u5b8c\uff09<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u672c\u6587\u5c55\u793a\u4e24\u4e2a\u4f7f\u7528<code>canvas<\/code>\u5b9e\u73b0\u5f39\u5e55\u6548\u679c\u7684\u6848\u4f8b\u3002\u5176\u4e2d\u4e00\u4e2a\u6548\u679c\u662f\u9759\u6001\u7684\u5f39\u5e55\u6570\u636e\u56fa\u5b9a\u7684\u65e0\u9650\u5faa\u73af\u7684\u6548\u679c\uff0c\u9002\u5408\u5728\u4e2a\u4eba\u535a\u5ba2\u6216\u8005\u8fd0\u8425\u9875\u9762\uff0c\u8fd9\u79cd\u975e\u89c6\u9891\u573a\u666f\u4f7f\u7528\uff1b\u53e6\u5916\u4e00\u4e2a\u6548\u679c\u662f\u52a8\u6001\u7684\u5f39\u5e55\u6570\u636e\u53ef\u53d8\u7684\u548c\u771f\u5b9eHTML5 <code>&lt;video&gt;<\/code>\u4ea4\u4e92\u7684\u5f39\u5e55\u6548\u679c\uff0c\u4e5f\u5c31\u662f\u771f\u89c6\u9891\u5f39\u5e55\u6548\u679c\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[896,180],"tags":[53,52,398,340,1162],"_links":{"self":[{"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/posts\/6386"}],"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=6386"}],"version-history":[{"count":0,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/posts\/6386\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/media?parent=6386"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/categories?post=6386"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/tags?post=6386"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}