// 檢測瀏覽器版本信息function getBrowserInfo(){  var Sys = {};  var ua = window.navigator.userAgent.toLowerCase();  var re =/(msie|firefox|chrome|opera|version).*?([/d.]+)/;  var m = ua.match(re);  Sys.browser = m[1].replace(/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("這種情況發(fā)生在不支持DHTML的老版本瀏覽器（現(xiàn)在一般都支持）")  }  

function browerType() {   var sUserAgent = navigator.userAgent.toLowerCase(); //瀏覽器的用戶代理設(shè)置為小寫，再進行匹配   var isIpad = sUserAgent.match(/ipad/i) == "ipad"; //或者利用indexOf方法來匹配   var isIphoneOs = sUserAgent.match(/iphone os/i) == "iphone";   var isMidp = sUserAgent.match(/midp/i) == "midp"; //移動信息設(shè)備描述MIDP是一套Java應(yīng)用編程接口，多適用于塞班系統(tǒng)   var isUc7 = sUserAgent.match(/rv:1.2.3.4/i) == "rv:1.2.3.4"; //CVS標(biāo)簽   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('該設(shè)備為移動設(shè)備'); // 做某些事情   } else {     alert('該設(shè)備為PC設(shè)備'); // 做某些事情   }}browerType();