非常实用的js判断手机端操作系统(Andorid/IOS),并自动跳转相应下载界面<br/>
 androidURL = "http://xxx/xxx.apk";

            var browser = {<br/>
                versions: function() {<br/>
                    var u = navigator.userAgent,<br/>
                    app = navigator.appVersion;<br/>
                    return {

                        android: u.indexOf('Android') > -1 || u.indexOf('Linux') > -1,

                        iPhone: u.indexOf('iPhone') > -1 ,                      

                        iPad: u.indexOf('iPad') > -1,<br/>
                        iPod: u.indexOf('iPod') > -1,

                    };<br/>
                } (),<br/>
                language: (navigator.browserLanguage || navigator.language).toLowerCase()<br/>
            }<br/>
            if (browser.versions.iPhone||browser.versions.iPad||browser.versions.iPod)<br/>
            {<br/>
                 //如果是ios系統，直接跳轉至appstore該應用首頁，傳遞参數为該應用在appstroe的id號<br/>
                 window.location.href="itms-apps://itunes.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=123456";<br/>
            }<br/>
            else if(browser.versions.android)<br/>
            {<br/>
                window.location.href = androidURL;<br/>
            }

转载请注明（B5教程网）原文链接：http://www.bcty365.com/content-69-1807-1.html

第二种方案：

<script language="javascript"><br/>
window.onload = function () {<br/>
alert("1");<br/>
var u = navigator.userAgent;
  document.write(typeof(navigator.platform)==”undefined”?””:navigator.platform)//输出对应的手机系统
if (u.indexOf('Android') > -1 || u.indexOf('Linux') > -1) {//安卓手机<br/>
alert("安卓手机");<br/>
// window.location.href = "mobile/index.html";<br/>
} else if (u.indexOf('iPhone') > -1) {//苹果手机<br/>
// window.location.href = "mobile/index.html";<br/>
alert("苹果手机");<br/>
} else if (u.indexOf('Windows Phone') > -1) {//winphone手机<br/>
alert("winphone手机");<br/>
// window.location.href = "mobile/index.html";<br/>
}<br/>
}<br/>
</script>