很多时候需要通过innerHTML动态插入javascript代码到指定的div中，或者通过ajax请求回来的内容里面包含javascript代码，然后把该代码插入指定的div中，但是插入后的script却无法执行。

原因：直接通过innerHTML动态嵌入的script，浏览器会当做普通的文本，不会当作SCRIPT节点维护到DOM里面，所以调用的时候找不到。

搜索网络上的一些文章之后，得到一个新的方法，是利用ie本身的机制来执行的。即当节点被移除的时候，ie会重新解析节点内部的html，有脚本则会执行相关的脚本，不过这里面的脚本必须设置defer属性才可以。新方法如下：

/**  * 描述：跨浏览器的设置 innerHTML 方法 (允许插入的 HTML 代码中包含 script 和 style )* 作者：kenxu <ken@ajaxwing.com>  * 日期：2006-03-23  * 参数：  *    el: 合法的 DOM 树中的节点  *    htmlCode: 合法的 HTML 代码  * 经测试的浏览器：ie5+, firefox1.5+, opera8.5+  * 此方法充分利用了浏览器自身的特性，执行效率高，兼容性好。唯一的缺点就是脚本中不能包含 document.write。*/
var setInnerHTML = function (el, htmlCode) {var ua = navigator.userAgent.toLowerCase();if (ua.indexOf('msie') >= 0 && ua.indexOf('opera') < 0) {htmlCode = '<div style="display:none">for IE</div>' + htmlCode;htmlCode = htmlCode.replace(/<script([^>]*)>/gi,'<script$1 defer>');el.innerHTML = htmlCode;el.removeChild(el.firstChild);} else {var el_next = el.nextSibling,el_parent = el.parentNode;el_parent.removeChild(el);el.innerHTML = htmlCode;if (el_next) {el_parent.insertBefore(el, el_next)} else {el_parent.appendChild(el);}}
}

此方法充分利用了浏览器自身的特性，执行效率高，兼容性好。 唯一的缺点就是脚本中不能包含 document.write。

还有另外一个方法如下：

/* innerhtml.js* Copyright Ma Bingyao <andot@ujn.edu.cn>* Version: 1.9* LastModified: 2006-06-04* This library is free.  You can redistribute it and/or modify it.* http://www.coolcode.cn/?p=117*/
var global_html_pool = [];
var global_script_pool = [];
var global_script_src_pool = [];
var global_lock_pool = [];
var innerhtml_lock = null;
var document_buffer = "";
function set_innerHTML(obj_id, html, time) {if (innerhtml_lock == null) {innerhtml_lock = obj_id;} else if (typeof(time) == "undefined") {global_lock_pool[obj_id + "_html"] = html;window.setTimeout("set_innerHTML('" + obj_id + "', global_lock_pool['" + obj_id + "_html']);", 10);return;} else if (innerhtml_lock != obj_id) {global_lock_pool[obj_id + "_html"] = html;window.setTimeout("set_innerHTML('" + obj_id + "', global_lock_pool['" + obj_id + "_html'], " + time + ");", 10);return;}function get_script_id() {return "script_" + (new Date()).getTime().toString(36)+ Math.floor(Math.random() * 100000000).toString(36);}document_buffer = "";document.write = function (str) {document_buffer += str;}document.writeln = function (str) {document_buffer += str + "\n";}global_html_pool = [];var scripts = [];html = html.split(/<\/script>/i);for (var i = 0; i < html.length; i++) {global_html_pool[i] = html[i].replace(/<script[\s\S]*$/ig, "");scripts[i] = {text : '',src : ''};scripts[i].text = html[i].substr(global_html_pool[i].length);scripts[i].src = scripts[i].text.substr(0, scripts[i].text.indexOf('>') + 1);scripts[i].src = scripts[i].src.match(/src\s*=\s*(\"([^\"]*)\"|\'([^\']*)\'|([^\s]*)[\s>])/i);if (scripts[i].src) {if (scripts[i].src[2]) {scripts[i].src = scripts[i].src[2];} else if (scripts[i].src[3]) {scripts[i].src = scripts[i].src[3];} else if (scripts[i].src[4]) {scripts[i].src = scripts[i].src[4];} else {scripts[i].src = "";}scripts[i].text = "";} else {scripts[i].src = "";scripts[i].text = scripts[i].text.substr(scripts[i].text.indexOf('>') + 1);scripts[i].text = scripts[i].text.replace(/^\s*<\!--\s*/g, "");}}var s;if (typeof(time) == "undefined") {s = 0;} else {s = time;}var script,add_script, remove_script;for (var i = 0; i < scripts.length; i++) {var add_html = "document_buffer += global_html_pool[" + i + "];\n";add_html += "document.getElementById('" + obj_id + "').innerHTML = document_buffer;\n";script = document.createElement("script");if (scripts[i].src) {script.src = scripts[i].src;if (typeof(global_script_src_pool[script.src]) == "undefined") {global_script_src_pool[script.src] = true;s += 2000;} else {s += 10;}} else {script.text = scripts[i].text;s += 10;}script.defer = true;script.type = "text/javascript";script.id = get_script_id();global_script_pool[script.id] = script;add_script = add_html;add_script += "document.getElementsByTagName('head').item(0)";add_script += ".appendChild(global_script_pool['" + script.id + "']);\n";window.setTimeout(add_script, s);remove_script = "document.getElementsByTagName('head').item(0)";remove_script += ".removeChild(document.getElementById('" + script.id + "'));\n";remove_script += "delete global_script_pool['" + script.id + "'];\n";window.setTimeout(remove_script, s + 10000);}var end_script = "if (document_buffer.match(/<\\/script>/i)) {\n";end_script += "set_innerHTML('" + obj_id + "', document_buffer, " + s + ");\n";end_script += "}\n";end_script += "else {\n";end_script += "document.getElementById('" + obj_id + "').innerHTML = document_buffer;\n";end_script += "innerhtml_lock = null;\n";end_script += "}";window.setTimeout(end_script, s);
}