js地址栏获取query

人懒话不多

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