javascript一个判断浏览器类型的函数（类）

初学Javascript时写的一个判断浏览器类型的函数（类），不是很完善，不过毕竟第一次写东东，纪念一下！

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 
<html> 
  <head> 
  <meta http-equiv="content-type" content="text/html; charset=gb2312"> 
  <meta name="generator" content="PSPad editor, www.pspad.com"> 
  <meta name="Author" content="Yemoo"> 
  <title>Get Exact Browser Type</title> 
  </head> 
  <body> 
<script type="text/javascript"> 
    /*--------------------------------------------------------------- 
    --this function can return the actual browser name and version.-- 
    --USESAGE:There are Two Methods(See the end of this function)  -- 
    --Create By Yemoo.  DateTime:2006-2-3 21:53:37                 -- 
    ---------------------------------------------------------------*/ 
    function browserinfo(){ 
        var Browser_Name=navigator.appName; 
        var Browser_Version=parseFloat(navigator.appVersion); 
        var Browser_Agent=navigator.userAgent; 
         
        var Actual_Version,Actual_Name; 
         
        var is_IE=(Browser_Name=="Microsoft Internet Explorer"); 
        var is_NN=(Browser_Name=="Netscape"); 
         
        if(is_NN){ 
            //upper 5.0 need to be process,lower 5.0 return directly 
            if(Browser_Version>=5.0){ 
                var Split_Sign=Browser_Agent.lastIndexOf("/"); 
                var Version=Browser_Agent.indexOf(" ",Split_Sign); 
                var Bname=Browser_Agent.lastIndexOf(" ",Split_Sign);

Actual_Version=Browser_Agent.substring(Split_Sign+1,Version); 
                Actual_Name=Browser_Agent.substring(Bname+1,Split_Sign); 
            } 
            else{ 
                Actual_Version=Browser_Version; 
                Actual_Name=Browser_Name; 
            } 
        } 
        else if(is_IE){ 
            var Version_Start=Browser_Agent.indexOf("MSIE"); 
            var Version_End=Browser_Agent.indexOf(";",Version_Start); 
            Actual_Version=Browser_Agent.substring(Version_Start+5,Version_End) 
            Actual_Name=Browser_Name; 
             
            if(Browser_Agent.indexOf("Maxthon")!=-1){ 
                Actual_Name+="(Maxthon)"; 
            } 
            else if(Browser_Agent.indexOf("Opera")!=-1){ 
                Actual_Name="Opera"; 
                var tempstart=Browser_Agent.indexOf("Opera"); 
                var tempend=Browser_Agent.length; 
                Actual_Version=Browser_Agent.substring(tempstart+6,tempend) 
            } 
        } 
        else{ 
            Actual_Name="Unknown Navigator" 
            Actual_Version="Unknown Version" 
        } 
        /*------------------------------------------------------------------------------ 
        --Your Can Create new properties of navigator(Acutal_Name and Actual_Version) -- 
        --Userage:                                                                    -- 
        --1,Call This Function.                                                       -- 
        --2,use the property Like This:navigator.Actual_Name/navigator.Actual_Version;-- 
        ------------------------------------------------------------------------------*/ 
        navigator.Actual_Name=Actual_Name; 
        navigator.Actual_Version=Actual_Version; 
         
        /*--------------------------------------------------------------------------- 
        --Or Made this a Class.                                                    -- 
        --Userage:                                                                 -- 
        --1,Create a instance of this object like this:var browser=new browserinfo;-- 
        --2,user this instance:browser.Version/browser.Name;                       -- 
        ---------------------------------------------------------------------------*/ 
        this.Name=Actual_Name; 
        this.Version=Actual_Version; 
    } 
    browserinfo(); 
     
    document.write("你使用的浏览器是:"+navigator.Actual_Name+",版本号:"+navigator.Actual_Version); 
</script> 
  </body> 
</html>

[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]

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