判断浏览器类型

<script>
/* *
* 判断浏览器
* usage : new Browser().IE7(IE6，Maxthon，Firefox); return boolean
* 属性：IE7，IE6，Maxthon，Firefox 。类型：boolean
*/



function Browser()
{
   this.getClassName = function(){
      return "Browser";
   }
   this.innerCheckBrowser();
   this.getBrowser=function(){
    if(this.IE6){return "IE6";}
    else if(this.IE7){return "IE7";}
    else if(this.Maxthon){return "Maxthon";}
    else if(this.Firefox){return "Firefox";}
    else {return "Unknown"};
   }
}
Browser.prototype.IE7 = false;
Browser.prototype.IE6 = false;
Browser.prototype.Maxthon = false;
Browser.prototype.Firefox = false;

/**
*内部调用
*/
Browser.prototype.innerCheckBrowser=function()
{
   if(navigator.appName.indexOf("Internet Explorer") != - 1 && navigator.userAgent.indexOf("Maxthon") == - 1)
   {
     if(window.XMLHttpRequest)
      {
         this.IE7 = true;
      }
      else
      {
         this.IE6 = true;
      }
   }
   else if(navigator.userAgent.indexOf("Maxthon") != - 1)
   {
      this.Maxthon = true;
   }
   else if(navigator.userAgent.indexOf("Firefox") != - 1)
   {
      this.Firefox = true;
   }
}
Browser.prototype.toString=function()
{
return "navigator.userAgent："+navigator.userAgent+"\nnavigator.appName："+navigator.appName;
}


var b = new Browser();
b.innerCheckBrowser();
alert(b.getBrowser());

</script>