Javascript Request获取请求参数如何实现

String.prototype.getParameter = function (key) { 
var re = new RegExp(key + '=([^&]*)(?:&)?'); 
return this.match(re) && this.match(re)[1]; 
};

测试代码：

<script type="text/javascript"> 
<!-- 
String.prototype.getParameter = function (key) { 
var re = new RegExp(key + '=([^&]*)(?:&)?'); 
return this.match(re) && this.match(re)[1]; 
}; 
var s = "http://www.baidu.com/index.html?x0=0&x1=1&x2=2&x3=3&x4=http://www.google.com"; 
document.write(s.getParameter('x0') + "<br/>"); 
document.write(s.getParameter('x1') + "<br/>"); 
document.write(s.getParameter('x2') + "<br/>"); 
document.write(s.getParameter('x3') + "<br/>"); 
document.write(s.getParameter('x4') + "<br/>"); 
document.write(s.getParameter('undefined') + "<br/>"); 
//--> 
</script>

输出：
0
1
2
3