js取得参数代码

function GetQueryString(name) { 
var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)","i"); 
var r = window.location.search.substr(1).match(reg); 
if (r!=null) return unescape(r[2]); return null; 
} 
alert(GetQueryString("id"));