/**
 * [isMobile 判断平台]
 * @param test:	0:iPhone	1:Android
 */
function ismobile(test){
	var u = navigator.userAgent, app = navigator.appVersion;
	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("")<0){
	  try{
	   if(/iPhone|mac|iPod|iPad/i.test(navigator.userAgent)){
	   	return '0';
	   }else{
	   	return '1';
	   }
	  }catch(e){}
	 }
	}else if( u.indexOf('iPad') > -1){
		return '0';
	}else{
		return '1';
	}
};

<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/i) || !!u.match(/MIDP|SymbianOS|NOKIA|SAMSUNG|LG|NEC|TCL|Alcatel|BIRD|DBTEL|Dopod|PHILIPS|HAIER|LENOVO|MOT-|Nokia|SonyEricsson|SIE-|Amoi|ZTE/), //是否为移动终端
   ios: !!u.match(/\(i[^;]+;( U;)"https://www.jb51.net";
}
if (browser.versions.android) {
window.location.href = "http://www.qq.com";
}
</script>

<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://m.jb51.net/"; 
 } 
 } 
 if(bIsIphoneOs || bIsAndroid){ 
 var sUrl = location.href; 
 if(!bForcepc){ 
  window.location.href = "http://m.jb51.net/"; 
 } 
 } 
 if(bIsMidp||bIsUc7||bIsUc||bIsCE||bIsWM){ 
 var sUrl = location.href; 
 if(!bForcepc){ 
  window.location.href = "http://m.jb51.net/"; 
 } 
 } 
} 
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 "dv_block").style.display = "block"; 
 } 
 else{ 
 document.getElementById("ad_block").style.display = "block"; 
 } 
} 
fBrowserRedirect(); 
</script>