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代码编辑器：

<!DOCTYPE html>
<meta charset="utf-8">
<link href="/static/next/css/tryit.css?v=2017082407" rel="stylesheet"/>
<script src="https://cdn.staticfile.org/jquery/2.2.4/jquery.min.js"></script>
<script src="http://cdn.static.twle.cn/libs/jquery/2.2.0/jquery.min.js"></script>
	
<script>
$(function() {
	var panything = "[\\w\\W]*?",
	// 空白
	pspace = "[\\x20\\t\\r\\n\\f]",
	
	// 标签结尾(whitespace or greater-than)
	pnameEnd = pspace.replace( "]", ">]" ),
	
	// 标签名 
	// https://html.spec.whatwg.org/multipage/syntax.html#tag-open-state
	// https://html.spec.whatwg.org/multipage/syntax.html#tag-name-state
	pname = "[a-z]" + pnameEnd.replace( "[", "[^/\\0" ) + "*",
	
	// 空元素 
	// https://html.spec.whatwg.org/multipage/syntax.html#void-elements
	pvoidName = "(?:area|base|br|col|embed|hr|img|input|keygen|link|menuitem|meta|param|" +
	"source|track|wbr)(?=" + pnameEnd + ")",
	
	// 属性 
	// https://html.spec.whatwg.org/multipage/syntax.html#attributes-2
	pattrs = "(?:" + pspace + "+[^\\0-\\x20\\x7f-\\x9f=\"'/>]+(?:" + pspace + "*=" + pspace +
	"*(?:\"" + panything + "\"|'" + panything + "'|" +
	pnameEnd.replace( "[", "[^" ) + "*(?!/)" +
	")|))*" + pspace + "*",
	
	// 关闭标签的尾随内容
	pcloseTail = "(?:" + pspace + panything + "|)",
	
	rspecialHtml = new RegExp(
		// 自关闭的非空元素: $1–$5
		"(<)(?!" + pvoidName + ")(" + pname + ")(" + pattrs + ")(\\/)(>)|" +
	  	// 非 HTML容器 (element, comment, 或者 CDATA): $6
	  	"(<(script|style|textarea)" + pattrs + ">" + panything + "<\\/\\7" + pcloseTail + ">|" +
	  	"<!--" + panything + "--)",
		"gi"
	),
	pspecialReplacement = "$1$2$3$5$1$4$2$5$6";
	
	$.htmlPrefilter = function( html ) {
		return ( html + "" ).replace( rspecialHtml, pspecialReplacement );
	};
	
	var htm = '<a /><meta>1516</meta>';
	alert($.htmlPrefilter(htm));
	alert(htm);
});
</script>
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代码编辑器：

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