通过JS语句判断WEB网站的访问端是电脑还是手机

<script type="text/javascript">
<!--
        //平台、设备和操作系统
        var system = {
            win: false,
            mac: false,
            xll: false,
            ipad:false
        };
        //检测平台
        var p = navigator.platform;
        system.win = p.indexOf("Win") == 0;
        system.mac = p.indexOf("Mac") == 0;
        system.x11 = (p == "X11") || (p.indexOf("Linux") == 0);
        system.ipad = (navigator.userAgent.match(/iPad/i) != null)?true:false;
        //跳转语句，如果是手机访问就自动跳转到wap.baidu.com页面
        if (system.win || system.mac || system.xll||system.ipad) {

        } else {

            window.location.href = "http://www.jdpatro.com/3g/";
        }
-->
</script>

<script type="text/javascript"> 
if(/AppleWebKit.*Mobile/i.test(navigator.userAgent) || (/MIDP|SymbianOS|NOKIA|SAMSUNG|LG|NEC|TCL|Alcatel|BIRD|DBTEL|Dopod|PHILIPS|HAIER|LENOVO|MOT-|Nokia|SonyEricsson|SIE-|Amoi|ZTE/.test(navigator.userAgent))){
    if(window.location.href.indexOf("?mobile")<0){
        try{
            if(/Android|webOS|iPhone|iPod|BlackBerry/i.test(navigator.userAgent)){
                window.location.href="http://shipei.qq.com/index.htm";
            }else if(/iPad/i.test(navigator.userAgent)){
            }else{
                window.location.href="http://shipei.qq.com/simple/s/index/"
            }
        }catch(e){}
    }
}
</script>

<script type="text/javascript">
    var browser = {
        versions : function() {
            var u = navigator.userAgent, app = navigator.appVersion;
            return {//移动终端浏览器版本信息                                 
            trident : u.indexOf('Trident') > -1, //IE内核                                 
            presto : u.indexOf('Presto') > -1, //opera内核                                 
            webKit : u.indexOf('AppleWebKit') > -1, //苹果、谷歌内核                                 
            gecko : u.indexOf('Gecko') > -1 && u.indexOf('KHTML') == -1, //火狐内核                                
            mobile : !!u.match(/AppleWebKit.*Mobile.*/)
                    || !!u.match(/AppleWebKit/), //是否为移动终端                                 
            ios : !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/), //ios终端                 
            android : u.indexOf('Android') > -1 || u.indexOf('Linux') > -1, //android终端或者uc浏览器                                 
            iPhone : u.indexOf('iPhone') > -1 || u.indexOf('Mac') > -1, //是否为iPhone或者QQHD浏览器                    
            iPad: u.indexOf('iPad') > -1, //是否iPad       
            webApp : u.indexOf('Safari') == -1,//是否web应该程序，没有头部与底部
            google:u.indexOf('Chrome')>-1
        };
    }(),
    language : (navigator.browserLanguage || navigator.language).toLowerCase()
    }
    document.writeln("语言版本: "+browser.language);
    document.writeln(" 是否为移动终端: "+browser.versions.mobile);
</script>

Mozilla/5.0 (iPad; U; CPU OS 3_2 like Mac OS X; en-us) AppleWebKit/531.21.10 (KHTML, like Gecko) Version/4.0.4 Mobile/7B334b Safari/531.21.10

function is_iPad(){        
 [object Object] [object Object] [object Object]var ua = navigator.userAgent.toLowerCase();
 [object Object] [object Object] [object Object]if(ua.match(/iPad/i)=="ipad") {                
 [object Object] [object Object] [object Object] [object Object] [object Object] [object Object]return true;
 [object Object] [object Object] [object Object]} else {
 [object Object] [object Object] [object Object] [object Object] [object Object] [object Object]return false;
 [object Object] [object Object] [object Object]}
}


$is_iPad = (bool) strpos($_SERVER['HTTP_USER_AGENT'],'iPad');

RewriteCond %{HTTP_USER_AGENT} ^.*iPad.*$
RewriteRule ^(.*)$ http://ipad.fairyfish.net [R=301]

<script type="text/javascript"> 
   var bForcepc
= fGetQuery("dv") == "pc";  
   function
fBrowserRedirect(){  
       var sUserAgent = navigator.userAgent.toLowerCase(); 
       var bIsIpad = sUserAgent.match(/ipad/i) ==
"ipad";   
       var bIsIphoneOs = sUserAgent.match(/iphone os/i) == "iphone os"; 
       var bIsMidp = sUserAgent.match(/midp/i) == "midp"; 
       var bIsUc7 = sUserAgent.match(/rv:1.2.3.4/i) == "rv:1.2.3.4"; 
       var bIsUc = sUserAgent.match(/ucweb/i) == "ucweb"; 
       var bIsAndroid = sUserAgent.match(/android/i) == "android"; 
       var bIsCE = sUserAgent.match(/windows ce/i) == "windows ce"; 
       var bIsWM = sUserAgent.match(/windows mobile/i) == "windows
mobile";  
       if(bIsIpad){  
           var sUrl =
location.href;     
           if(!bForcepc){  
               window.location.href = "http://ipad.mail.163.com/"; 
           }  
       }  
       if(bIsIphoneOs || bIsAndroid){  
           var sUrl =
location.href;     
           if(!bForcepc){  
               window.location.href = "http://smart.mail.163.com/"; 
           }  
       }  
       if(bIsMidp||bIsUc7||bIsUc||bIsCE||bIsWM){  
           var sUrl =
location.href;     
           if(!bForcepc){  
               window.location.href = "http://m.mail.163.com/"; 
           }  
       }  
   } 
   function
fGetQuery(name){//获取参数值  
       var sUrl = window.location.search.substr(1); 
       var r = sUrl.match(new RegExp("(^|&)" + name +
"=([^&]*)(&|$)")); 
       return (r == null ? null : (r[2])); 
   } 
   function
fShowVerBlock(){    
       if(bForcepc){  
           document.getElementByIdx_x("dv_block").style.display = "block"; 
       }  
       else{  
           document.getElementByIdx_x("ad_block").style.display = "block"; 
       }  
   } 
   fBrowserRedirect();  
   </script>