function IETester(userAgent) {
            var UA = userAgent || navigator.userAgent;
            if (/msie/i.test(UA)) {
                return UA.match(/msie (\d+\.\d+)/i)[1];
            } else if (~UA.toLowerCase().indexOf('trident') && ~UA.indexOf('rv')) {
                return UA.match(/rv:(\d+\.\d+)/)[1];
            }
            return false;
        }
        //console.log(IETester()); //不传参数返回当前IE版本，如果不是IE内核浏览器，返回false
        if (IETester() == 8.0 || IETester() == 7.0 || IETester() == 6.0 || IETester() == 5.0) {
           document.write("您的浏览器版本过低，建议升级");
            if (confirm("您的浏览器版本过低，点击【确定】下载360浏览器，如不升级您将不能正常浏览网页！")) {
                location.href = "https://browser.360.cn/ee/";
            } else {
                alert("您将退出网页！");
                window.close();
                //return false;
            }


        }
        IETester('Mozilla/5.0 (Windows NT 6.3; WOW64; Trident/7.0; rv:11.0) like Gecko');