// 检测浏览器版本信息
function getBrowserInfo(){
  var Sys = {};
  var ua = window.navigator.userAgent.toLowerCase();
  var re =/(msie|firefox|chrome|opera|version).*"'safari");
  Sys.ver = m[2];
  return Sys;
}
var BomInfo = getBrowserInfo;
console.log(BomInfo ());

var navigatorName = "Microsoft Internet Explorer"; 
var isIE = false;  
if( window.navigator.appName == navigatorName ){  
  isIE = true;  
  alert("ie")  
}else{  
  alert("not ie")  
}  

if(window.addEventListener){ 
   alert("not ie");  
}else if(window.attachEvent){  
   alert("is ie");  
}else{  
    alert("这种情况发生在不支持DHTML的老版本浏览器（现在一般都支持）")  
}  

function browerType() {
   var sUserAgent = navigator.userAgent.toLowerCase(); //浏览器的用户代理设置为小写，再进行匹配
   var isIpad = sUserAgent.match(/ipad/i) == "ipad"; //或者利用indexOf方法来匹配
   var isIphoneOs = sUserAgent.match(/iphone os/i) == "iphone";
   var isMidp = sUserAgent.match(/midp/i) == "midp"; //移动信息设备描述MIDP是一套Java应用编程接口，多适用于塞班系统
   var isUc7 = sUserAgent.match(/rv:1.2.3.4/i) == "rv:1.2.3.4"; //CVS标签
   var isUc = sUserAgent.match(/ucweb/i) == "ucweb";
   var isAndroid = sUserAgent.match(/android/i) == "android";
   var isCe = sUserAgent.match(/windows ce/i) == "windows ce";
   var isWM = sUserAgent.match(/windows mobil/i) == "windows mobil";
   if (isIpad || isIphoneOs || isMidp || isUc7 || isUc || isAndroid || isCe || isWM) {
     alert('该设备为移动设备'); // 做某些事情
   } else {
     alert('该设备为PC设备'); // 做某些事情
   }
}
browerType();