JS获取Url参数的方法

function UrlSearch() {
    var name, value;
    var str = location.href; //取得整个地址栏
    var num = str.indexOf("?")
    str = str.substr(num + 1); //取得所有参数   stringvar.substr(start [, length ]
    var arr = str.split("&"); //各个参数放到数组里
    for (var i = 0; i < arr.length; i++) {
        num = arr[i].indexOf("=");
        if (num > 0) {
            name = arr[i].substring(0, num);
            value = arr[i].substr(num + 1);
            this[name] = value;
        }
    }
};

var Request = new UrlSearch();
code = Request.code == undefined ? "" : Request.code;