{"id":7424,"date":"2018-03-20T23:47:46","date_gmt":"2018-03-20T15:47:46","guid":{"rendered":"http:\/\/www.zhangxinxu.com\/wordpress\/?p=7424"},"modified":"2018-03-20T23:49:43","modified_gmt":"2018-03-20T15:49:43","slug":"htmlunknownelement-html5-custom-elements","status":"publish","type":"post","link":"https:\/\/www.zhangxinxu.com\/wordpress\/2018\/03\/htmlunknownelement-html5-custom-elements\/","title":{"rendered":"HTMLUnknownElement\u4e0eHTML5\u81ea\u5b9a\u4e49\u5143\u7d20\u7684\u6545\u4e8b"},"content":{"rendered":"<p>by <a href=\"http:\/\/www.zhangxinxu.com\/\">zhangxinxu<\/a> from <a href=\"http:\/\/www.zhangxinxu.com\/wordpress\/?p=7424\">http:\/\/www.zhangxinxu.com\/wordpress\/?p=7424<\/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\u3001\u4e86\u89e3HTMLUnknownElement\u5143\u7d20<\/h3>\n<p>\u5728\u7f51\u9875\u4e2d\uff0c\u968f\u4fbf\u5199\u4e00\u4e2a\u6807\u7b7e\uff0c\u4f8b\u5982\uff1a<\/p>\n<pre>&lt;username&gt;zhangxinxu&lt;\/username&gt;<\/pre>\n<p>\u8fd9\u4e2a<code>&lt;username&gt;<\/code>\u5c31\u662f\u4e00\u4e2aHTMLUnknownElement\u5143\u7d20\u3002<\/p>\n<p>\u7b80\u5355\u6d4b\u8bd5\u4e0b\uff1a<\/p>\n<pre>document.querySelector('username') instanceof HTMLUnknownElement;    <span style=\"color: green;\">\/\/ \u8fd4\u56de\u503c\u662ftrue<\/span><\/pre>\n<p>\u5728HTML\u89c4\u8303\u4e2d\uff0cHTMLUnknownElement\u5143\u7d20\u662f\u4e00\u4e2a\u88ab\u8ba4\u53ef\u7684\u5408\u6cd5\u7684\u5143\u7d20\uff0cCSS\u53ef\u4ee5\u65e0\u969c\u788d\u4f7f\u7528\uff0c\u4f8b\u5982\uff1a<\/p>\n<pre>username {\n    text-transform: uppercase;\n}<\/pre>\n<style type=\"text\/css\">username{text-transform: uppercase;}<\/style>\n<p>\u5219\u5b9e\u65f6\u6548\u679c\u5982\u4e0b\uff08\u7528\u6237\u540d\u5927\u5199\uff09\uff1a<\/p>\n<p><username>zhangxinxu<\/username><\/p>\n<p>HTMLUnknownElement\u7ee7\u627fHTMLElement\u4e2d\u7684\u65b9\u6cd5\uff0c\u56e0\u6b64\uff0c\u57fa\u672c\u4e0a\uff0c\u5e38\u7528\u7684HTML\u65b9\u6cd5\u90fd\u662f\u53ef\u4ee5\u7545\u5feb\u4f7f\u7528\u7684\uff0c\u4f8b\u5982\uff0c\u6587\u5b57\u53d8\u7ea2\u8272\uff0c\u53ef\u4ee5\u76f4\u63a5\uff1a<\/p>\n<pre>document.querySelector('username').style.color = 'red';<\/pre>\n<h4>\u6211\u4eec\u4e0d\u4e00\u6837<\/h4>\n<p>\u5728HTML\u4e16\u754c\u4e2d\uff0cHTMLUnknownElement\u548cHTMLDivElement\uff0cHTMLSpanElement\u7b49\u7b49\u90fd\u662f\u5e73\u7ea7\u7684\uff0c\u5e73\u8d77\u5e73\u5750\uff0c\u90fd\u662fHTMLElement\u7684\u5b50\u96c6\u3002\u90a3\u5176\u4e2d\u6709\u6ca1\u6709\u4ec0\u4e48\u4e0d\u4e00\u6837\u7684\u5730\u65b9\u5462\uff1f<\/p>\n<p>\u533a\u522b\u5728\u4e8e\uff0c\u89c4\u8303\u4e2d\u7684\u4e00\u90e8\u5206HTML\u5143\u7d20\u81ea\u5df1\u5e26\u6709\u4e00\u4e9b\u7279\u6b8a\u7684\u5c5e\u6027\u6216\u8005\u65b9\u6cd5\uff0c\u4f8b\u5982\uff0c\u8868\u5355\u5143\u7d20HTMLFormElement\u5143\u7d20\u6709<code>reset()<\/code>\u65b9\u6cd5\uff0c<code>novalidate<\/code>\u5c5e\u6027\u3002\u7136\u800c\uff0cHTMLUnknownElement\u81ea\u5df1\u662f\u6ca1\u6709\u643a\u5e26\u4efb\u4f55\u5c5e\u6027\u548c\u65b9\u6cd5\u3002<\/p>\n<p>\u8fd9\u4f7f\u5176\u662f\u4e00\u4ef6\u597d\u4e8b\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u4e3aHTMLUnknownElement\u6269\u5c55\u975e\u5e38\u79c1\u6709\u7684\u65b9\u6cd5\uff0c\u800c\u4e0d\u7528\u62c5\u5fc3\u4f1a\u5f71\u54cd\u5176\u4ed6\u5143\u7d20\u3002\u4f8b\u5982\u6765\u8bf4\uff0c\u9ed8\u8ba4\u6240\u6709HTMLUnknownElement\u5143\u7d20\u7684<code>display<\/code>\u8ba1\u7b97\u503c\u90fd\u662f<code>inline<\/code>\uff0c\u6211\u4eec\u53ef\u4ee5\u6269\u5c55\u4e86<code>block()<\/code>\u65b9\u6cd5\u4f7f\u5176\u5757\u72b6\u5316\u3002<\/p>\n<pre>HTMLUnknownElement.prototype.block = function () {\n    this.style.display = 'block';\n};<\/pre>\n<p>\u6b64\u65f6\u6267\u884c<code>document.querySelector('username').block()<\/code>\u5c31\u53ef\u4ee5\u8ba9<code>&lt;username&gt;<\/code>\u5143\u7d20\u5757\u72b6\u5316\u4e86\u3002<\/p>\n<p>\u4ece\u5b9e\u7528\u89d2\u5ea6\u8bb2\uff0c\u57fa\u4e8e\u539f\u578b\u6269\u5c55\u7684\u65b9\u6cd5\uff0c\u8fd8\u4e0d\u7b97\u592a\u667a\u80fd\uff0c\u8981\u662f\u53ef\u4ee5\u9488\u5bf9\u4e0d\u540c\u6807\u7b7e\u7c7b\u578b\u8fdb\u884c\u6269\u5c55\u5c31\u66f4\u597d\u4e86\uff0c\u8fd9\u4e2a\u540e\u9762\u4f1a\u4ecb\u7ecd\u3002<\/p>\n<h3>\u4e8c\u3001HTMLUnknownElement\u4e0e\u81ea\u5b9a\u4e49\u5143\u7d20\uff08Custom Elements\uff09<\/h3>\n<p>\u6211\u4e4b\u524d\u4ee5\u4e3a\u5199\u4e00\u4e2a\u89c4\u8303\u4ee5\u5916\u7684\u6807\u7b7e\u5143\u7d20\u5c31\u662f\u81ea\u5b9a\u4e49\u5143\u7d20\uff0c\u540e\u6765\u53d1\u73b0\u4e0d\u662f\u7684\u3002HTMLUnknownElement\u4e0e\u81ea\u5b9a\u4e49\u5143\u7d20\u5e76\u4e0d\u80fd\u76f4\u63a5\u76f8\u7b49\uff0c\u751a\u81f3\u53ef\u4ee5\u8bf4\u662f\u964c\u8def\u4e24\u4eba\u3002<\/p>\n<p>W3\u89c4\u8303\u4e2d\uff0c\u5bf9\u81ea\u5b9a\u4e49\u5143\u7d20\u7684\u5b9a\u4e49\u662f\u4e2d\u95f4\u5fc5\u987b\u8981\u6709\u77ed\u6a2a\u7ebf\uff08\u5c31\u662f\u952e\u76d8\u4e0a\u7684\u51cf\u53f7\uff09\u8fde\u63a5\uff0c\u5e76\u4e14\u6d4f\u89c8\u5668\u4e5f\u662f\u8fd9\u4e48\u8ba4\u4e3a\u7684\uff0c\u4f8b\u5982\uff1a<\/p>\n<pre>document.createElement('username') instanceof HTMLUnknownElement;    <span style=\"color: green;\">\/\/ \u8fd4\u56de\u503c\u662ftrue<\/span>\ndocument.createElement('user-name') instanceof HTMLUnknownElement;    <span style=\"color: green;\">\/\/ \u8fd4\u56de\u503c\u662ffalse<\/span><\/pre>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201803\/2018-03-20_160940.png\" alt=\"\u81ea\u5b9a\u4e49\u5143\u7d20\u4e0e\u672a\u77e5\u5143\u7d20\u5224\u65ad\u7ed3\u679c\u622a\u56fe\" width=\"477\" height=\"81\"><\/p>\n<p>\u4ece\u8fd9\u4e00\u70b9\u770b\uff0cHTMLUnknownElement\u4e00\u5b9a\u4e0d\u662f\u81ea\u5b9a\u4e49\u5143\u7d20\uff0c\u6362\u53e5\u901a\u4fd7\u7684\u8bdd\u89e3\u91ca\u5c31\u662f\u201c\u81ea\u5b9a\u4e49\u5143\u7d20\u4e0d\u7b49\u4e8e\u968f\u4fbf\u5b9a\u4e49\u5143\u7d20\u201d\u3002<\/p>\n<p>\u867d\u7136\u90fd\u662f\u81ea\u5df1\u547d\u540d\u7684\u6807\u7b7e\uff0c\u591a\u4e00\u4e2a\u77ed\u6a2a\u548c\u6ca1\u6709\u77ed\u6a2a\u53bb\u533a\u522b\u4e4b\u5927\uff0c\u8fdc\u4e0d\u662f\u5916\u9762\u770b\u4e0a\u53bb\u7684\u90a3\u70b9\u533a\u522b\u3002<\/p>\n<p>\u89c4\u8303\u548c\u6d4f\u89c8\u5668\u4e3a\u6709\u77ed\u6a2a\u7684\u81ea\u5b9a\u4e49\u5143\u7d20\u5f00\u4e86\u5f88\u591a\u5f88\u68d2\u7684\u7279\u6743\uff0c\u53ef\u4ee5\u8ba9\u6211\u4eec\u5b9e\u73b0\u5f88\u591a\u5f88\u68d2\u7684\u4e8b\u60c5\uff01<\/p>\n<h3>\u4e09\u3001\u81ea\u5b9a\u4e49\u5143\u7d20\uff08Custom Elements\uff09\u4e13\u573a<\/h3>\n<p>\u81ea\u5b9a\u4e49\u5143\u7d20\u6709\u54ea\u4e9b\u7279\u6743\u5462\uff1f\u6211\u4eec\u5148\u4ece\u76ee\u524d\u53ef\u4ee5\u5728\u5b9e\u9645\u9879\u76ee\u4e2d\u5e94\u7528\u7684\u7279\u6027\u8bf4\u8d77\u3002<\/p>\n<h4>1. ES6\u4e0b\u7684\u7ee7\u627f\u4e0e\u81ea\u5b9a\u4e49HTML\u5143\u7d20\u7c7b\u578b<\/h4>\n<p>\u5bf9\u4e8e\u81ea\u5b9a\u4e49\u5143\u7d20\uff0c\u89c4\u8303\u63d0\u4f9b\u4e86\u4e00\u5957\u5404\u79cdHTML\u7279\u6027\u53ef\u7ee7\u627f\u53ef\u6269\u5c55\u7684\u673a\u5236\uff0c\u901a\u5e38\u4f7f\u7528\u5957\u8def\u5982\u4e0b\uff1a<\/p>\n<ol>\n<li>ES6 class\u7ee7\u627f\uff1b<\/li>\n<li>customElements\u5b9a\u4e49\u5143\u7d20\uff1b<\/li>\n<\/ol>\n<p>\u5148\u8bf4\u8bf4\u76ee\u524d\u652f\u6301\u76f8\u5bf9\u8f83\u597d\u7684<strong>\u533f\u540d\u81ea\u5b9a\u4e49\u5143\u7d20<\/strong>\uff08Autonomous custom elements\uff09\uff0c\u4e5f\u5c31\u662f\u7ee7\u627f\u81eaHTMElement\u7684\u7528\u6cd5\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u6211\u4eec\u5b9e\u73b0\u4e00\u4e2a\u57fa\u4e8e<code>rows<\/code>\u5c5e\u6027\u591a\u884c\u6253\u70b9\u6548\u679c\u7684\u5c0f\u7ec4\u4ef6\u3002<\/p>\n<p>\u6ce8\u610f\uff0c\u4e0b\u9762\u7684\u6f14\u793a\u4ee3\u7801\u57fa\u672c\u4e0a\u53ef\u4ee5\u4f5c\u4e3a\u5404\u7c7b\u81ea\u5b9a\u4e49\u5143\u7d20\uff08\u751a\u81f3Web Components\uff09\u4f7f\u7528\u7684<strong>\u6a21\u677f<\/strong>\uff0c\u5f88\u6709\u7528\uff0c\u4f8b\u5982\uff0c\u5bf9\u4e8e\u5b66\u4e60\u7c7b\u4f3cVue\u7684\u5b9e\u65f6\u5237\u65b0\u5f88\u6709\u5e2e\u52a9\uff0c\u5bf9\u4e8e\u5b66\u4e60Shadow DOM\u548cWeb Components\u4e5f\u662f\u975e\u5e38\u597d\u7684\u6848\u4f8b\u3002\u4ee5\u540e\u8981\u5b9e\u73b0\u7c7b\u4f3c\u529f\u80fd\uff0c\u4ee3\u7801\u62f7\u8d1d\u8fc7\u53bb\uff0c\u4fee\u6539\u4fee\u6539\u5373\u53ef\uff01<\/p>\n<pre>class HTMLEllElement extends HTMLElement {\n  <span style=\"color:green;\">\/\/ \u6307\u5b9a\u89c2\u5bdf\u7684\u5c5e\u6027\uff0c\u8fd9\u6837attributeChangedCallback\u624d\u4f1a\u8d77\u4f5c\u7528<\/span>\n  static get observedAttributes() { return ['rows']; }\n\n  constructor() {\n    <span style=\"color:green;\">\/\/ constructor\u4e2d\u9996\u5148\u7b2c\u4e00\u4ef6\u4e8b\u60c5\u5c31\u662f\u8c03\u7528 super\n    \/\/ super\u6307\u4ee3\u4e86\u6574\u4e2aprototype\u6216\u8005__proto__\u6307\u5411\u7684\u5bf9\u8c61\n    \/\/ \u8fd9\u4e00\u6b65\u514d\u4e0d\u4e86\u7684<\/span>\n    super();\n\n    <span style=\"color:green;\">\/\/ \u521b\u5efashadow\u5143\u7d20\uff0c\u5b9e\u9645\u4e0a\uff0c\u4ece\u672c\u4f8b\u8981\u5b9e\u73b0\u7684\u6548\u679c\u8bb2\uff0c\n    \/\/ \u76f4\u63a5\u5143\u7d20\u4e0a\u8bbe\u7f6e\u4e5f\u53ef\u4ee5\uff0c\u5c31\u662fHTML\u4e11\u4e86\u70b9\uff0cCSS\u8981\u653e\u5728\u5916\u90e8\n    \/\/ \u4e14\u76ee\u524d\u706b\u72d0\u5e76\u4e0d\u652f\u6301shadow dom\u53ef\u4ee5\u4e0d\u7528\uff0c\n    \/\/ \u4f46\u4e00\u5207\u4e3a\u4e86\u5b66\u4e60\uff0c\u8fd8\u662f\u5c55\u73b0\u4e0b\u73b0\u4ee3web\u7ec4\u4ef6\u7684\u5b9e\u73b0\u65b9\u5f0f<\/span>\n    var shadow = this.attachShadow({\n        <span style=\"color:green;\">\/\/ open\u5916\u90e8\u53ef\u8bbf\u95ee\uff08\u901a\u8fc7element.shadowRoot\uff09\uff0cclosed\u5219\u4e0d\u80fd<\/span>\n        mode: 'open'\n    });\n\n    <span style=\"color:green;\">\/\/ \u6587\u672c\u5185\u5bb9\u79fb\u52a8\u5230shadow dom\u5143\u7d20\u4e2d<\/span>\n    var div = document.createElement('div');\n    div.innerHTML = this.innerHTML;\n    this.innerHTML = '';\n    var style = document.createElement('style');\n    shadow.appendChild(style);\n    shadow.appendChild(div);\n  }\n\n  <span style=\"color:green;\">\/\/ \u4e0b\u97624\u4e2a\u65b9\u6cd5\u4e3a\u5e38\u7528\u751f\u547d\u5468\u671f<\/span>\n  connectedCallback() {\n    console.log('\u81ea\u5b9a\u4e49\u5143\u7d20\u52a0\u5165\u9875\u9762');\n    <span style=\"color:green;\">\/\/ \u6267\u884c\u6e32\u67d3\u66f4\u65b0<\/span>\n    this._updateRendering();\n  }\n  disconnectedCallback() {\n    <span style=\"color:green;\">\/\/ \u672c\u4f8b\u5b50\u8be5\u751f\u547d\u5468\u671f\u672a\u4f7f\u7528\uff0c\u5360\u4f4d\u793a\u610f<\/span>\n    console.log('\u81ea\u5b9a\u4e49\u5143\u7d20\u4ece\u9875\u9762\u79fb\u9664');\n  }\n  adoptedCallback() {\n    <span style=\"color:green;\">\/\/ \u672c\u4f8b\u5b50\u8be5\u751f\u547d\u5468\u671f\u672a\u4f7f\u7528\uff0c\u5360\u4f4d\u793a\u610f<\/span>\n    console.log('\u81ea\u5b9a\u4e49\u5143\u7d20\u8f6c\u79fb\u5230\u65b0\u9875\u9762');\n  }\n  attributeChangedCallback(name, oldValue, newValue) {\n    console.log('\u81ea\u5b9a\u4e49\u5143\u7d20\u5c5e\u6027\u53d1\u751f\u53d8\u5316');\n    this._rows = newValue;\n    <span style=\"color:green;\">\/\/ \u6267\u884c\u6e32\u67d3\u66f4\u65b0<\/span>\n    this._updateRendering();\n  }\n\n  <span style=\"color:green;\">\/\/ \u8bbe\u7f6e\u76f4\u63a5get\/set rows\u5c5e\u6027\u7684\u65b9\u6cd5<\/span>\n  get rows() {\n    return this._rows;\n  }\n  set rows(v) {\n    this.setAttribute('rows', v);\n  }\n\n  _updateRendering() {\n    <span style=\"color:green;\">\/\/ \u6839\u636e\u53d8\u5316\u7684\u5c5e\u6027\uff0c\u6539\u53d8\u7ec4\u4ef6\u7684UI<\/span>\n    var shadow = this.shadowRoot;\n    var childNodes = shadow.childNodes;\n    var rows = this._rows;\n    for (var i = 0; i &lt; childNodes.length; i++) {\n      if (childNodes[i].nodeName === 'STYLE') {\n        childNodes[i].textContent = `div {\n          display: -webkit-box;\n          -webkit-line-clamp: ${rows};\n          -webkit-box-orient: vertical;\n          overflow: hidden;\n        }`;\n      }\n    }\n  }\n}\n<span style=\"color:green;\">\/\/ \u5b9a\u4e49x-ell\u6807\u7b7e\u5143\u7d20\u4e3a\u591a\u884c\u6253\u70b9\u5143\u7d20<\/span>\ncustomElements.define('x-ell', HTMLEllElement);<\/pre>\n<p>\u4e0a\u9762\u4ee3\u7801\u770b\u4e0a\u53bb\u5f88\u957f\uff0c\u5b9e\u9645\u4e0a\uff0c\u4e5f\u5c312\u90e8\u5206\uff0c\u4e00\u4e2a<code>class<\/code>\u7ee7\u627f\uff0c\u4e00\u4e2a<code>customElements.define<\/code>\u6ce8\u518c\u3002\u4e2a\u4e2d\u7ec6\u8282\u53c2\u89c1\u6ce8\u91ca\uff0c\u662f\u975e\u5e38\u597d\u7684\u5b66\u4e60\u6848\u4f8b\u3002<\/p>\n<p>\u90a3\u5b9e\u73b0\u4e86\u4ec0\u4e48\u6548\u679c\u5462\uff1f<\/p>\n<p>\u5f88\u68d2\u7684\u6548\u679c\uff0c\u6211\u4eec\u76f4\u63a5\u5728\u9875\u9762\u4e2d\u5199\u5165\u5982\u4e0bCSS\u548cHTML\uff1a<\/p>\n<pre>x-ell {\n  display: block;\n}<\/pre>\n<pre>&lt;x-ell rows=\"2\"&gt;\u5bf9\u4e8e\u73b0\u4ee3\u6d4f\u89c8\u5668\uff0c\u4f8b\u5982webkit\u5185\u6838\u7684\u6d4f...\u7ec4\u5408\u5982\u4e0b\u3002&lt;\/x-ell&gt;<\/pre>\n<p>\u8fd9\u6bb5\u6587\u5b57\u5982\u679c\u8d85\u8fc72\u884c\uff0c\u5c31\u4f1a\u81ea\u52a8\u5728\u672b\u5c3e\u6253\u70b9\u3002\u53ef\u4ee5\u770b\u5230\uff0c\u9875\u9762\u4e0a\u6ca1\u6709\u4efb\u4f55\u5173\u4e8e\u6253\u70b9\u76f8\u5173CSS\u4ee3\u7801\u7684\u8bbe\u7f6e\uff0c\u56e0\u4e3a\u5168\u90e8\u5728\u81ea\u5b9a\u4e49HTMLEllElement\u7684\u65f6\u5019\u5199\u5728Shadow DOM\u4e2d\u4e86\u3002<\/p>\n<p>\u5982\u679c\u60f3\u89813\u884c\u6253\u70b9\uff0c\u4e5f\u975e\u5e38\u7b80\u5355\uff0c\u76f4\u63a5\u8bbe\u7f6e<code>rows<\/code>\u4e3a<code>3<\/code>\u5373\u53ef\u3002\u6211\u4eec\u53ef\u4ee5\u76f4\u63a5\u624b\u52a8\u4fee\u6539\uff1a<\/p>\n<pre>&lt;x-ell rows=\"3\"&gt;<\/pre>\n<p>\u4e5f\u53ef\u4ee5\u76f4\u63a5\u4e00\u884cJS\u76f4\u63a5\u4fee\u6539\u5c5e\u6027\uff1a<\/p>\n<pre>document.querySelector('x-ell').rows = '3';<\/pre>\n<p>\u6d4f\u89c8\u5668\u4f1a\u81ea\u52a8\u6e32\u67d3\u62103\u884c\u6587\u5b57\u6253\u70b9\uff0c\u8fd9\u5c31\u662f\u73b0\u4ee3Web Components\u7ec4\u4ef6\u7684\u6a21\u6837\u3002<\/p>\n<p>\u773c\u89c1\u4e3a\u5b9e\uff0c\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a<a href=\"http:\/\/www.zhangxinxu.com\/study\/201803\/custom-element-ellipsis-by-rows.html\" rel=\"noopener\" target=\"_blank\">HTML5\u81ea\u5b9a\u4e49\u5143\u7d20\u4e0erows\u5c5e\u6027\u76f4\u63a5\u63a7\u5236\u51e0\u884c\u6253\u70b9demo<\/a><\/p>\n<p>\u6548\u679c\u5982\u4e0bGif\u622a\u5c4f\u6240\u793a\uff0c\u70b9\u51fb\u6309\u94ae\u8bbe\u7f6e<code>rows<\/code>\u4e3a<code>3<\/code>\uff0c\u7136\u540e3\u884c\u6253\u70b9\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201803\/line-rows2-to-rows3-s.gif\" width=\"226\" height=\"114\" alt=\"gif\u622a\u5c4f 2\u884c\u6253\u70b9\u53d83\u884c\" class=\"alignnone\" \/><\/p>\n<p><code>rows<\/code>\u5c5e\u6027\u7684\u8868\u73b0\u5c31\u597d\u50cf<code>&lt;textarea&gt;<\/code>\u5143\u7d20\u7684<code>rows<\/code>\u5c5e\u6027\u4e00\u6837\uff0c\u4fee\u6539\u540e\u76f4\u63a5\u89e6\u53d1\u4e86\u5143\u7d20\u672c\u8eabUI\u7684\u53d8\u5316\uff0c\u800c\u4e14\u662f\u5b9e\u65f6\u7684\u3002\u8fd9\u5c31\u662f\u81ea\u5b9a\u4e49\u5143\u7d20\uff0c\u81ea\u5df1\u5b9a\u4e49\u4e00\u4e2a\u5143\u7d20\uff0c\u53ef\u4ee5\u548c\u539f\u751f\u5143\u7d20\u4e00\u6837\u7684\u884c\u4e3a\u548c\u7279\u6027\uff0c\u662f\u4e0d\u662f\u5f88\u9177\uff01<\/p>\n<p>\u7136\u800c\u517c\u5bb9\u6027\u95ee\u9898\u4e0d\u5bb9\u5ffd\u89c6\uff0c\u5982\u679c\u53ea\u8003\u8651ES6\u7ee7\u627f\u7279\u6027\uff0cFirefox\uff0cSafari\u7b49\u6d4f\u89c8\u5668\u4e5f\u662f\u53ef\u4ee5\u7528\u7684\uff0c\u4e5f\u5c31\u662f\u79fb\u52a8\u7aef\u5192\u8fdb\u4e0b\u4e5f\u662f\u53ef\u4ee5\u4f7f\u7528\u7684\u3002\u4f46\u662f\u81ea\u5b9a\u4e49\u5143\u7d20\u6ce8\u518c\uff0c\u4ee5\u53caShadow DOM\u7b49\u7279\u6027\u76ee\u524d\u5c31Chrome\uff0cAndroid\u4ee5\u53caUC\u7b49\u6d4f\u89c8\u5668\u652f\u6301\uff0c\u56e0\u6b64\uff0c\u53ea\u80fd\u7528\u5728\u4e00\u4e9b\u5185\u90e8\u4ea7\u54c1\uff08\u5982\u4e2d\u540e\u53f0\u7ba1\u7406\u7cfb\u7edf\u3001\u5185\u90e8\u5de5\u5177\uff09\u4e0a\u3002Firefox\u76ee\u524d\u60f3\u8981\u652f\u6301\u53ef\u4ee5\u5f00\u542f\u5b9e\u9a8c\u529f\u80fd\uff0cabout:config\uff0c\u7136\u540e\u8bbe\u7f6e<code>dom.webcomponents.customelements.enabled<\/code>\u4e3a<code>true<\/code>\uff0c\u4ee5\u53ca<code>dom.webcomponents.shadowdom.enabled<\/code>\u4e3a<code>true<\/code>\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201803\/2018-03-20_215620.png\" width=\"361\" height=\"104\" alt=\"\u542f\u7528\u706b\u72d0\u81ea\u5b9a\u4e49\u5143\u7d20\u529f\u80fd\u622a\u56fe\" class=\"alignnone\" \/><\/p>\n<p>\u4e0d\u8fc7\uff0c\u76ee\u524dFirefox\u5728\u5f00\u53d1\uff0cEdge\u5728\u8003\u8651\uff0c\u76f8\u4fe1\u4e00\u7edf\u6c5f\u5c71\u7684\u65f6\u5019\u5f88\u5feb\u5c31\u4f1a\u5230\u6765\u3002<\/p>\n<p><strong>\u5c0f\u7591\u95ee<\/strong><br \/>\n<code>customElements.define<\/code>\u81ea\u5b9a\u4e49\u5143\u7d20\u7684\u65f6\u5019\uff0c\u6807\u7b7e\u53ef\u5426\u6ca1\u6709\u77ed\u6a2a\u7ebf\uff0c\u4f8b\u5982\uff1a<\/p>\n<pre>customElements.define('ell', HTMLEllElement);<\/pre>\n<p>\u7b54\u6848\u662f\uff0c\u4e0d\u53ef\u4ee5\uff0c\u975e\u77ed\u6a2a\u7ebf\u81ea\u5b9a\u4e49\u5143\u7d20\u4e0d\u8ba4\u4e3a\u662f\u5408\u6cd5\u5143\u7d20\uff0c\u4e8e\u662f\u4f1a\u62a5\u9519\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201803\/2018-03-20_220949.png\" width=\"364\" height=\"60\" alt=\"\u975e\u5408\u6cd5\u81ea\u5b9a\u4e49\u5143\u7d20\u62a5\u9519\" class=\"alignnone\" \/><\/p>\n<hr>\n<p>\u4e0b\u9762\u518d\u770b\u6765\u4e0b\u76ee\u524d\u8fd8\u6ca1\u6709\u6d4f\u89c8\u5668\u652f\u6301\uff0c\u4f46\u5373\u5c06\u652f\u6301\u7684<strong>\u5b9a\u5236\u5185\u7f6e\u5143\u7d20<\/strong>\uff08Customized built-in elements\uff09\u3002<\/p>\n<p>\u4ec0\u4e48\u610f\u601d\u5462\uff1f\u4e0a\u9762\u81ea\u5b9a\u4e49\u5143\u7d20\u6211\u4eec\u90fd\u662f\u7ee7\u627f\u4e8eHTMLElement\uff0c\u5b9e\u9645\u4e0a\uff0cHTMLElement\u8fd8\u6709\u975e\u5e38\u975e\u5e38\u90fd\u7684\u5185\u7f6e\u5b50\u96c6\u5143\u7d20\uff0c\u4f8b\u5982\u4e0a\u9762\u63d0\u5230\u7684HTMLDivElement\uff0cHTMLSpanElement\uff0cHTMLFormElement\u5143\u7d20\u7b49\uff0c\u6bcf\u4e00\u79cd\u7c7b\u578b\u6807\u7b7e\u51e0\u4e4e\u90fd\u5bf9\u5e94\u4e00\u79cd\u5185\u7f6e\u5143\u7d20\u3002<\/p>\n<p>\u6240\u8c13\u201c\u5b9a\u5236\u5185\u7f6e\u5143\u7d20\u201d\uff0c\u6307\u7684\u5c31\u662f\u6211\u4eec\u7684\u81ea\u5b9a\u4e49\u5143\u7d20\u7ee7\u627f\u81ea\u8fd9\u4e9b\u5185\u7f6e\u5143\u7d20\u3002<\/p>\n<p>\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u6211\u4eec\u5e0c\u671b\u5b9a\u4e49\u4e00\u4e2a\u7ee7\u627f<code>&lt;form&gt;<\/code>\u5143\u7d20\u7684\u81ea\u5b9a\u4e49\u5143\u7d20\uff0c\u540d\u4e3a<code>custom-form<\/code>\uff0c\u53ef\u4ee5\u8fd9\u4e48\u5904\u7406\uff1a<\/p>\n<pre>class HTMLCustomFormElement extends HTMLFormElement { <span style=\"color:green;\">\/* \u7565 *\/<\/span> }\ncustomElements.define('custom-form', HTMLCustomFormElement);<\/pre>\n<p>\u6b64\u65f6\uff0c\u5143\u7d20<code>&lt;custom-form&gt;<\/code>\u5c31\u6709\u4e86\u539f\u751f<code>&lt;form&gt;<\/code>\u7684\u5404\u79cd\u5c5e\u6027\u548c\u65b9\u6cd5\uff0c\u4f8b\u5982\u76f4\u63a5\u53ef\u4ee5\u4f7f\u7528<code>reset()<\/code>\u65b9\u6cd5\u91cd\u7f6e\u5185\u90e8\u8868\u5355\u5143\u7d20\u7684\u503c\u3002<\/p>\n<p>\u8fd9\u79cd\u7279\u6027\u5728\u6211\u4eec\u5b9e\u9645\u5f00\u53d1\u7684\u65f6\u5019\u6709\u4ec0\u4e48\u7528\u5462\uff1f<\/p>\n<p>\u4e3e\u4f8b\u6765\u8bf4\uff0c\u5728HTML\u6807\u51c6\u4e2d\uff0c<code>&lt;form&gt;<\/code>\u5143\u7d20\u662f\u4e0d\u80fd\u76f8\u4e92\u5d4c\u5957\u7684\uff0c\u8fd9\u5c31\u5bfc\u81f4\u4e00\u4e2a\u95ee\u9898\uff0c\u5f53\u6211\u4eec\u9700\u8981\u5c40\u90e8\u91cd\u7f6e\u8868\u5355\u5185\u7684\u67d0\u4e9b\u5c5e\u6027\u503c\u7684\u65f6\u5019\uff0c\u5c31\u4e0d\u80fd\u4f7f\u7528<code>reset()<\/code>\u65b9\u6cd5\uff0c\u56e0\u4e3a\u4f1a\u8bef\u4f24\u5176\u4ed6\u53ef\u80fd\u5df2\u7ecf\u8f93\u5165\u7684\u503c\u3002<\/p>\n<p>\u4f8b\u5982\u8868\u5355\u4e2d\u6709\u5f88\u591a\u8f93\u5165\u4fe1\u606f\uff0c\u5916\u52a0\u4e00\u4e2a\u56fe\u7247\u4e0a\u4f20\u3002\u9700\u6c42\u662f\u56fe\u7247\u9009\u62e9\u5373\u4e0a\u4f20\u5b8c\u6bd5\uff0c\u6b64\u65f6\u9700\u8981\u5728\u56fe\u7247Ajax\u4e0a\u4f20\u5b8c\u6bd5\u540e\u91cd\u7f6e<code>file<\/code>\u7c7b\u578b<code>input<\/code>\u7684\u503c\uff0cIE\u4e0b\u503c\u91cd\u7f6e\u4e0d\u50cfChrome\uff0c\u53ef\u4ee5\u76f4\u63a5\u8bbe\u7f6e<code>value<\/code>\u4e3a\u7a7a\uff0c\u6700\u4f73\u505a\u6cd5\u76f4\u63a5<code>&lt;form&gt;<\/code>\u5143\u7d20\u7684<code>reset()<\/code>\u65b9\u6cd5\uff0c\u6b64\u65f6\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u5728<code>file<\/code>\u7c7b\u578b<code>input<\/code>\u5916\u9762\u5305\u4e00\u5c42<code>&lt;custom-form&gt;<\/code>\u6807\u7b7e\uff0c\u8fd9\u6837\uff0cHTML\u89e3\u6790\u65f6\u5019\u65e2\u6ca1\u6709\u5d4c\u5957\u95ee\u9898\uff0c\u53c8\u53ef\u4ee5\u4f7f\u7528<code>reset()<\/code>\u65b9\u6cd5\u5bf9\u8868\u5355\u5143\u7d20\u8fdb\u884c\u91cd\u7f6e\u3002<\/p>\n<p>\u5f53\u7136\uff0c\u4e0a\u9762\u7684\u5206\u6790\u53ea\u662f\u7406\u8bba\u4e0a\u7684\u5224\u65ad\uff0c\u7531\u4e8e\u76ee\u524d\u6ca1\u6709\u6d4f\u89c8\u5668\u652f\u6301\u5b9a\u5236\u5185\u7f6e\u5143\u7d20\uff0c\u56e0\u6b64\u65e0\u6cd5\u65ad\u5b9a\u662f\u5426\u771f\u7684\u5982\u6b64\uff0c\u7b49\u56de\u5934\u6d4f\u89c8\u5668\u652f\u6301\u4e86\uff0c\u6211\u4eec\u518d\u770b\u4e00\u770b\u7a76\u7adf\u3002<\/p>\n<h4>2. \u81ea\u5b9a\u4e49\u5143\u7d20\u4e0eHTML import\u5f15\u5165<\/h4>\n<p>\u81ea\u5b9a\u4e49\u5143\u7d20\u8fd8\u53ef\u4ee5\u5728HTML\u6a21\u5757\u4e2d\u4f7f\u7528\uff0c\u76ee\u524d\u4ec5Chrome\u652f\u6301\u3002<\/p>\n<p>\u5927\u81f4\u5957\u8def\u8fd9\u6837\u7684\uff1a<\/p>\n<ol>\n<li>HTML\u6a21\u5757\u6ce8\u518c\u4e0e\u6784\u5efa\u81ea\u5b9a\u4e49\u5143\u7d20\uff1b<\/li>\n<li>\u6bcd\u9875\u9762\u5f15\u5165\u6a21\u5757\uff1b<\/li>\n<li>\u6bcd\u9875\u9762\u81ea\u5b9a\u4e49\u6807\u7b7e\u81ea\u52a8\u7ec4\u4ef6\u5448\u73b0\uff1b<\/li>\n<\/ol>\n<p>\u4f8b\u5982\u4e0b\u9762HTML\uff1a<\/p>\n<pre>&lt;link rel=\"import\" href=\"module.html\"&gt;\n&lt;zxx-info\/&gt;<\/pre>\n<p>\u6b64\u65f6<code>&lt;zxx-info&gt;<\/code>\u8fd9\u4e2a\u5143\u7d20\u5728\u9875\u9762\u4e0a\u5448\u73b0\u51fa\u6765\u7684\u6548\u679c\u5c31\u662f\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201803\/2018-03-20_233054.png\" width=\"259\" height=\"171\" alt=\"\u5e05\u54e5\u6548\u679c\u51fa\u73b0\" class=\"alignnone\" \/><\/p>\n<p>\u90a3\u8fd9\u4e2amodule.html\u7a76\u7adf\u505a\u4e86\u4ec0\u4e48\u4e8b\u60c5\u5462\uff1f\u5c31\u662f\u81ea\u5b9a\u4e49<code>&lt;zxx-info&gt;<\/code>\u8fd9\u4e2a\u5143\u7d20\u3002<\/p>\n<p>\u5b8c\u6574\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<pre>&lt;template id=\"tpl\"&gt;\n  &lt;style&gt;\n  .scope {\n    contain: content;\n  }\n  .scope &gt; img {\n    float: left;\n    margin-right: 10px;\n  }\n  .scope &gt; p {\n    margin: 0;\n    overflow: hidden;  \n  }\n  &lt;\/style&gt;\n  &lt;div class=\"scope\"&gt;\n    &lt;img src=\"zxx.jpg\"&gt;\n    &lt;p&gt;\u5e05\u54e5\u4e00\u679a\uff01&lt;\/p&gt;\n  &lt;\/div&gt;\n&lt;\/template&gt;\n&lt;script&gt;\n  <span style=\"color:green;\">\/\/ \u5b9a\u4e49&lt;zxx-info&gt;<\/span>\n  class HTMLZxxInfoElement extends HTMLElement {\n    constructor() {\n      super();\n      <span style=\"color:green;\">\/\/ \u5185\u90e8\u663e\u793a\u4fe1\u606f <\/span>   \n      this.innerHTML = document.currentScript.ownerDocument.querySelector('#tpl').innerHTML;\n    }\n  };\n  \/\/ \u6ce8\u518c\n  customElements.define('zxx-info', HTMLZxxInfoElement);\n&lt;\/script&gt;<\/pre>\n<p>\u4e24\u90e8\u5206\uff0c\u4e00\u90e8\u5206<a href=\"http:\/\/www.zhangxinxu.com\/wordpress\/2014\/07\/hello-html5-template-tag\/\">\u6a21\u677f<\/a>\uff0c\u4e00\u90e8\u5206\u81ea\u5b9a\u4e49\u5143\u7d20\u5b9a\u4e49\u548c\u6ce8\u518c\u3002\u90fd\u662fWeb Components\u4e2d\u7684\u6982\u5ff5\u3002\u4e0d\u5c55\u5f00\uff0c\u5927\u5bb6\u611f\u53d7\u611f\u53d7\u5373\u53ef\u3002<\/p>\n<p>\u773c\u89c1\u4e3a\u5b9e\uff0c\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a<a href=\"http:\/\/www.zhangxinxu.com\/study\/201803\/custom-element-html-import.html\" rel=\"noopener\" target=\"_blank\">HTML5\u81ea\u5b9a\u4e49\u5143\u7d20\u4e0eHTML 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