<pre class="line-numbers language-csharp">  <code>    //高亮代碼  </code></pre>

....highlightAll: function(async, callback) {  //var elements = document.querySelectorAll('code[class*="language-"], [class*="language-"] code, code[class*="lang-"], [class*="lang-"] code');  //for (var i=0, element; element = elements[i++];) {  //  _.highlightElement(element, async === true, callback);  //}      //支持 PRE 標簽，修改為  var clsReg = //s*/blanguage-/b/s*/;  var pres = document.querySelectorAll("pre");  for (var i = 0, pre; pre = pres[i++];) {    var isCode = false;    if ((pre.firstChild     && (isCode = (pre.firstChild.tagName === "CODE"))     && clsReg.test(pre.firstChild.className))     || clsReg.test(pre.className)) {      if (!isCode) pre.innerHTML = "<code>" + pre.innerHTML + "</code>";      _.highlightElement(pre.firstChild, async === true, callback);    }   }}....