问设备浏览器检测

EN

    var ua = navigator.userAgent;
    if(navigator.appName == "Netscape"){ //for Firefox, Safari and Chrome
         //do nothing, stay on this page.
         return;
    }
    else if(navigator.appName == 'Microsoft Internet Explorer'){
        //check for version

        var re  = new RegExp("MSIE ([0-9]{1,}[\.0-9]{0,})");
        if (re.exec(ua) != null){
          version = parseFloat( RegExp.$1 );
        }
        if(version >= 9.0){
           //do nothing, stay on this page.
           return;
        }
        else{
           //redirect to the site for lower IE versions.
        }
    }
    else if(ua.match(/Android/i)){
       //code for skipping to Android version
    }
    else if(ua.match(/iPhone/i)){
       //code for skipping to iPhone version
    }
    else if(ua.match(/iPad/i)){
       //code for skipping to iPad version
    }