JS 判断浏览器客户端类型(ipad,iphone,android)

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/531.21.10Javascript代码function is_iPad(){     var ua = navigator.userAgent.toLowerCase();     if(ua.match(/iPad/i)=="ipad") {        return true;     } else {        return false;     } }因此，判断ipad,iphone,android的代码为：
<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 : unescape(r[2])); } function fShowVerBlock(){        if(bForcepc){         document.getElementById("dv_block").style.display = "block";     }     else{         document.getElementById("ad_block").style.display = "block";     } } fBrowserRedirect(); </script>