解决JavaScript在IE浏览器中trim函数不可用的问题

<script language="javascript"> 
 var test1 = "  aa  "; 
 test1 = test1.toString(); 
 test1 = test1.trim(); 
</script>

手动实现trim函数

String.prototype.trim=function(){return this.replace(/(^\s*)|(\s*$)/g,"");} 

<script language="javascript"> 
 String.prototype.trim=function(){return this.replace(/(^\s*)|(\s*$)/g,"");} 
 var test1 = "  aa  "; 
 test1 = test1.toString(); 
 test1 = test1.trim(); 
</script> 

使用jQuery处理字符串

<!DOCTYPE html>  
<html>  
<head>  
 <script src="http://code.jquery.com/jquery-latest.js"></script>  
</head>  
<body>  
 <button>Show Trim Example</button>  
<script>  
$("button").click(function () {  
var str = "   lots of spaces before and after   ";  
alert("'" + str + "'");  
str = jQuery.trim(str);  
alert("'" + str + "' - no longer");  
});  
</script>  
</body>  
</html>