我们经常使用动态加载Javascript，写个函数很容易现实，之前也写过一个函数，不过当加载多个JS时，只能根据浏览器返回的顺序来先后加载，这肯定不是我们想要的，现在使用了一下技巧，当加载多个JS时，能按照我们的顺序加载：

Js代码  

1. /* 
2.     Name:动态加载JS 
3.     Author:kingwell Leng 
4.     Date : 2013/4/21 
5.     E-mail: jinhua.leng##gmail.com 
6.  
7. */  
8. function getScript(obj, callback) {  
9.     var arr = obj,  
10.     timeout,  
11.     str = typeof obj === ‘string‘;  
12.     function add() {  
13.         var script = document.createElement("script");  
14.             header = document.getElementsByTagName("head")[0];  
15.         script.src = str ? obj : arr[0];  
16.         script.type = "text/javascript";  
17.         if (str) {  
18.             if (script.readyState) {  
19.                 script.onreadystatechange = function () {  
20.                     if (script.readyState === ‘loaded‘ || script.readyState === ‘complete‘) {  
21.                         script.onreadystatechange = null;  
22.                         callback && callback();  
23.                     }  
24.                 };  
25.             } else {  
26.                 script.onload = function () {  
27.                     callback && callback();  
28.                 };  
29.             }  
30.         } else {  
31.             if (arr.length >= 1) {  
32.                 if (script.readyState) {  
33.                     script.onreadystatechange = function () {  
34.                         if (script.readyState === ‘loaded‘ || script.readyState === ‘complete‘) {  
35.                             script.onreadystatechange = null;  
36.                             arr.shift();  
37.                             timeout = setTimeout(add, 1);  
38.                         }  
39.                     };  
40.                 } else {  
41.                     script.onload = function () {  
42.                         arr.shift();  
43.                         timeout = setTimeout(add, 1);  
44.                     };  
45.                 }  
46.             } else {  
47.                 clearTimeout(timeout);  
48.                 callback && callback();  
49.             }  
50.         }  
51.         header.appendChild(script);  
52.     }  
53.     add();  
54. }  

/*    Name:动态加载JS    Author:kingwell Leng    Date : 2013/4/21    E-mail: jinhua.leng##gmail.com*/function getScript(obj, callback) {	var arr = obj,	timeout,	str = typeof obj === ‘string‘;	function add() {		var script = document.createElement("script");			header = document.getElementsByTagName("head")[0];		script.src = http://www.mamicode.com/str ? obj : arr[0];"text/javascript";		if (str) {			if (script.readyState) {				script.onreadystatechange = function () {					if (script.readyState === ‘loaded‘ || script.readyState === ‘complete‘) {						script.onreadystatechange = null;						callback && callback();					}				};			} else {				script.onload = function () {					callback && callback();				};			}		} else {			if (arr.length >= 1) {				if (script.readyState) {					script.onreadystatechange = function () {						if (script.readyState === ‘loaded‘ || script.readyState === ‘complete‘) {							script.onreadystatechange = null;							arr.shift();							timeout = setTimeout(add, 1);						}					};				} else {					script.onload = function () {						arr.shift();						timeout = setTimeout(add, 1);					};				}			} else {				clearTimeout(timeout);				callback && callback();			}		}		header.appendChild(script);	}	add();}

调用：

Js代码  

1. getScript([‘http://code.jquery.com/jquery-1.9.1.min.js‘,‘js1.js‘, ‘js2.js‘, ‘js3.js‘, ‘js4.js‘], function () {  
2.     alert(‘我是按顺序加载啦‘);  
3. });  

getScript([‘http://code.jquery.com/jquery-1.9.1.min.js‘,‘js1.js‘, ‘js2.js‘, ‘js3.js‘, ‘js4.js‘], function () {	alert(‘我是按顺序加载啦‘);});

 现在是按照我们写代码的顺序加载啦...