通过判断浏览器的userAgent，用正则来判断是否是ios和Android客户端

<script type="text/javascript">
    var u = navigator.userAgent;
    var isAndroid = u.indexOf('Android') > -1 || u.indexOf('Adr') > -1; //android终端
    var isiOS = !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/); //ios终端
    alert('是否是Android：'+isAndroid);
    alert('是否是iOS：'+isiOS);
</script>

检查是否是移动端（Mobile）、ipad、iphone、微信、QQ等。

<script type="text/javascript">
//判断访问终端
var browser={
    versions:function(){
        var u = navigator.userAgent, 
            app = navigator.appVersion;
        return {
            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.*/), //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('Adr') > -1, //android终端
            iPhone: u.indexOf('iPhone') > -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
            weixin: u.indexOf('MicroMessenger') > -1, //是否微信 （2015-01-22新增）
            qq: u.match(/\sQQ/i) == " qq" //是否QQ
        };
    }(),
    language:(navigator.browserLanguage || navigator.language).toLowerCase()
}
</script>

判断是否IE内核

/判断是否IE内核
if(browser.versions.trident){ alert("is IE"); }
//判断是否webKit内核
if(browser.versions.webKit){ alert("is webKit"); }
//判断是否移动端
if(browser.versions.mobile||browser.versions.android||browser.versions.ios){ alert("移动端"); }

检测浏览器语言

currentLang = navigator.language; //判断除IE外其他浏览器使用语言
if(!currentLang){//判断IE浏览器使用语言
currentLang = navigator.browserLanguage;
}
alert(currentLang);

判断iPhone|iPad|iPod|iOS|Android客户端

if (/(iPhone|iPad|iPod|iOS)/i.test(navigator.userAgent)) {  //判断iPhone|iPad|iPod|iOS
    //alert(navigator.userAgent);  
    window.location.href ="iPhone.html";
} else if (/(Android)/i.test(navigator.userAgent)) {   //判断Android
    //alert(navigator.userAgent); 
    window.location.href ="Android.html";
} else {  //pc
    window.location.href ="pc.html";
};

判断pc还是移动端

<script>
　　//判断是否手机端访问
    var userAgentInfo = navigator.userAgent.toLowerCase();
    var Agents = ["android", "iphone",
                "symbianos", "windows phone",
                "ipad", "ipod"];
    var ly=document.referrer;  //返回导航到当前网页的超链接所在网页的URL

    for (var v = 0; v < Agents.length; v++) {
        if (userAgentInfo.indexOf(Agents[v]) >= 0&&(ly==""||ly==null)) {
            this.location.href='http://m.***.com';  //wap端地址
        }
    }
</script>

常用跳转代码

<script type="text/javascript">
    // borwserRedirect
    (function browserRedirect(){
      var sUserAgent = navigator.userAgent.toLowerCase();
      var bIsIpad = sUserAgent.match(/ipad/i) == 'ipad';
      var bIsIphone = 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) == 'web';
      var bIsCE = sUserAgent.match(/windows ce/i) == 'windows ce';
      var bIsWM = sUserAgent.match(/windows mobile/i) == 'windows mobile';
      var bIsAndroid = sUserAgent.match(/android/i) == 'android';
      var pathname = location.pathname
      if(bIsIpad || bIsIphone || bIsMidp || bIsUc7 || bIsUc || bIsCE || bIsWM || bIsAndroid ){
        window.location.href = 'http://m.geekjc.com'+pathname;  //wap端地址
      }
    })();
 </script>

备注：文章来源于极客教程https://www.geekjc.com/