1 window.onload = function()
2 {
3 var al = document.getElementsByTagName("script");
4 var new_element=document.createElement("script");
5 var joine = []
6 for(var i = 0; i<al.length; i++)
7 {
8 joine.push(al[i].getAttribute("src"));
9 }
10 var ajoine = joine.join(",");
11 console.log(ajoine);
12 if(IndexDemo(ajoine,'jquery.min.js')>0)
13 {
14 console.log('1');
15 //alert(1);
16 }else{
17 console.log('2');
18 var new_element=document.createElement("script");
19 new_element.setAttribute("type","text/javascript");
20 new_element.setAttribute("src","/static/js/jquery-1.5.1/jquery.min.js");// 在这里引入了a.js
21 document.body.appendChild(new_element);
22 //alert(2);
23 }
24 }
25
26 function IndexDemo(str1,str2){
27 var list = str1
28 var s = list.indexOf(str2);
29 return(s);
30 }
IndexDemo() 方法查询字符.
var ajoine = joine.join(","); 方法 数组转字符串.
可修改参数去实现自己的判断效果.