JavaScript 获取GET中的值

//直接取URL
alert( GetQueryString("action")); 

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

//将url作为参数传入
var strUrl='http://localhost/phone/phone.php?UserEvent=SignIn&EnterpriseID=0000011&UserName=1004';
alert (GetQueryString(str,'UserEvent'));

function GetQueryString(url,name) 
{ 
    var reg = new RegExp("(^|&)"+ name +"=([^&]*)(&|$)"); 
    var arr=url.split("?");
    //alert(arr.length); 
    //alert(arr[1]);
    var r = arr[1].match(reg); 
    if (r!=null) return unescape(r[2]); return null; 
}