<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>

腾讯网的适配代码

<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>

如何判断访问网站的机器类型-如何判断ipad

如何判断是否是 iPad 浏览器呢，关键是看它的 User Agent 中是否有 iPad。iPad 使用的是 Safari Mobile 浏览器，他的的 User Agent 是：

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/531.21.10function 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]

JS 判断浏览器客户端类型(ipad,iphone,android)

<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>