js判断３６０浏览器 兼容模式IE版本

var ms_ie = false;
       var ua = window.navigator.userAgent.toLowerCase();
       var old_ie = ua.indexOf('MSIE');
       var new_ie = ua.indexOf('trident/');
       var is360 = false;
       var append = document.getElementById("append");
       if((old_ie > -1) || (new_ie > -1)) {
           ms_ie = true;
       }
       if(window.navigator.appName.indexOf("Microsoft") != -1) {
           me_ie = true;
       }
       if((window.navigator.mimeTypes[40] || !window.navigator.mimeTypes.length)) {
           is360 = true;
       }
       if(ms_ie) {
           var DEFAULT_VERSION = 8.0;
           var ua = navigator.userAgent.toLowerCase();
           var isIE = ua.indexOf("msie")>-1;
           var safariVersion;
           if(isIE){
               safariVersion =  ua.match(/msie ([d.]+)/)[1];
           }
           if(safariVersion <= DEFAULT_VERSION ){
               alert('系统检测到您正在使用ie8以下内核的浏览器，不能实现完美体验，请更换或升级浏览器访问！')
           }
       }