javascript宿主对象之window.navigator

// 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).*?([\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("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();