代码如下：
（本文来源于图老师网站，更多请访问https://m.tulaoshi.com/webkaifa/）/**
** author: site120
** function : get script part from html document
**/
var loadJs = function(str , delayTime)
{
var delayTime = delayTime || 100;
var regExp_scriptTag = new RegExp("＜\s*script([^]*)([\s\S]*？)＜/\s*script\s*" , "gi");
var regExp_scriptAttrib_src = new RegExp("\s*src？\s*=\s*("([^"]+)"|'([^']+)'|\s*([^\s]+)\s*)" , "gi");
var arr_scriptTag = null;
var arr_scriptAttib = null;
var scriptData = "";
var jsList = new Array();
while ((arr_scriptTag=regExp_scriptTag.exec(str)) != null)
{
while ((arr_scriptAttib=regExp_scriptAttrib_src.exec(arr_scriptTag[1])) != null)
{
if (arr_scriptAttib[3])
{
jsList.push(arr_scriptAttib[3]);
}
else if (arr_scriptAttib[2])
{
jsList.push(arr_scriptAttib[2]);
}
else
{
jsList.push(arr_scriptAttib[1]);
}
}
scriptData += (arr_scriptTag[2]);
}
for (var i=0; i＜jsList.length; i++)
{
var script = document.createElement("script");
script.src = jsList[i];
document.body.appendChild(script);
}
if (scriptData.length 0)
{
var fn = "_siteFunction_" + new Date().getTime() + "_" + parseInt(Math.random()*10000) + "_120";
scriptData = " var " + fn + " = function(){ " + scriptData + " }; "+fn+"();"
window.eval(scriptData);
}
}
这是用Js来处理正则表达式，原理与Java一样，
功能是读取一段网页源代码，并将它里面所有的script标签，截取并加载运行。
这里面的[sS]*？利用非贪婪模式来匹配最近script标签之间的所有代码。包括换行
![[正则表达式]贪婪模式与非贪婪模式](https://img.tulaoshi.com/201602/19/42d4d6464ff1cd648000071b2074412a_thumb_189.jpg)
