JS获取当前浏览器名及版本号

<!DOCTYPE>
<html>
<head>
	<title></title>
</head>
<script type="text/javascript">

        // 获取当前浏览器名 及 版本号
        function appInfo(){  

            var browser = {appname: 'unknown', version: 0},  
                  userAgent = window.navigator.userAgent.toLowerCase();  // 使用navigator.userAgent来判断浏览器类型
            //msie,firefox,opera,chrome,netscape  
            if ( /(msie|firefox|opera|chrome|netscape)\D+(\d[\d.]*)/.test( userAgent ) ){  
                browser.appname = RegExp.$1;  
                browser.version = RegExp.$2;  
            } else if ( /version\D+(\d[\d.]*).*safari/.test( userAgent ) ){ // safari  
                browser.appname = 'safari';  
                browser.version = RegExp.$2;  
            }  
            return browser;  
            
        }

        var testBrowser = appInfo();  
        var browerName=testBrowser.appname;
        var browerVersion=testBrowser.version;
        var exite=browerName.indexOf("msie");  // 若包含msie则返回0  不包含返回-1

        alert(browerName);
        alert(browerVersion);
</script>
<body>
</body>
</html>

第二种兼容性比较好

window.onload = function ()
{
    var userAgent = navigator.userAgent,     
    rMsie = /(msie\s|trident.*rv:)([\w.]+)/,     
    rFirefox = /(firefox)\/([\w.]+)/,     
    rOpera = /(opera).+version\/([\w.]+)/,     
    rChrome = /(chrome)\/([\w.]+)/,     
    rSafari = /version\/([\w.]+).*(safari)/;    
    var browser;    
    var version;    
    var ua = userAgent.toLowerCase();    
    function uaMatch(ua){    
      var match = rMsie.exec(ua);    
      if(match != null){    
        return { browser : "IE", version : match[2] || "0" };    
      }    
      var match = rFirefox.exec(ua);    
      if (match != null) {    
        return { browser : match[1] || "", version : match[2] || "0" };    
      }    
      var match = rOpera.exec(ua);    
      if (match != null) {    
        return { browser : match[1] || "", version : match[2] || "0" };    
      }    
      var match = rChrome.exec(ua);    
      if (match != null) {    
        return { browser : match[1] || "", version : match[2] || "0" };    
      }    
      var match = rSafari.exec(ua);    
      if (match != null) {    
        return { browser : match[2] || "", version : match[1] || "0" };    
      }    
      if (match != null) {    
        return { browser : "", version : "0" };    
      }    
    }    
    var browserMatch = uaMatch(userAgent.toLowerCase());    
    if (browserMatch.browser){    
      browser = browserMatch.browser;    
      version = browserMatch.version;    
    }  
    var vcode = parseInt(version); //强制转成整形  
    if(vcode<9){
        window.location.href="tanchuang.html";
    }else{
        window.history.back(-1); 
    }
};

JS获取当前浏览器名及版本号

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