获取URL中？后面的字段

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