【获取url 问号后参数】防中文乱码

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;
        }