JS 判斷瀏覽器用戶端類型(ipad,iphone,android)

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如何判斷是否是 iPad 瀏覽器呢，關鍵是看它的 User Agent 中是否有 iPad。iPad 使用的是 Safari Mobile 瀏覽器，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/531.21.10

Javascript代碼
function is_iPad(){ 
    var ua = navigator.userAgent.toLowerCase(); 
    if(ua.match(/iPad/i)=="ipad") { 
       return true; 
    } else { 
       return false; 
    } 
}
因此，判斷ipad,iphone,android的代碼為：

<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){//擷取參數值      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>