js判断手机端操作系统(Andorid/IOS)

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
 androidURL = "http://xxx/xxx.apk";
 
            var browser = {
                versions: function() {
                    var u = navigator.userAgent,
                    app = navigator.appVersion;
                    return {
 
                        android: u.indexOf('Android') > -1 || u.indexOf('Linux') > -1,
 
                        iPhone: u.indexOf('iPhone') > -1 ,                      
 
                        iPad: u.indexOf('iPad') > -1,
                        iPod: u.indexOf('iPod') > -1,
 
                    };
                } (),
                language: (navigator.browserLanguage || navigator.language).toLowerCase()
            }
            if (browser.versions.iPhone||browser.versions.iPad||browser.versions.iPod)
            {
                 //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
                 window.location.href="itms-apps://itunes.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=123456";
            }
            else if(browser.versions.android)
            {
                window.location.href = androidURL;
            } 

<script language="javascript">
window.onload = function () {
alert("1");
var u = navigator.userAgent;

if (u.indexOf('Android') > -1 || u.indexOf('Linux') > -1) {//安卓手机
alert("安卓手机");
// window.location.href = "mobile/index.html";
} else if (u.indexOf('iPhone') > -1) {//苹果手机
// window.location.href = "mobile/index.html";
alert("苹果手机");
} else if (u.indexOf('Windows Phone') > -1) {//winphone手机
alert("winphone手机");
// window.location.href = "mobile/index.html";
}
}
</script>