javascript获取链接参数

var url = "http://test.cn/index.php?class=9&id=2&key=88";

function parseQueryString(url){
    var params = {};
    var arr = url.split("?");
    if(arr.length <=1)
        return params;
    arr = arr[1].split("&");
    for(var i=0,l=arr.length; i<l; i++){
        var a = arr[i].split("=");
        params[a[0]] = a[1];
    }
    return params;
}
var ps = parseQueryString(url);
console.log(ps);