封装GetQueryString()方法来获取URL的value值

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