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系统，直接跳转至appstore该应用首页，传递参数为该应用在appstroe的id号

                 window.location.href="itms-apps://itunes.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=123456";

            }

            else if(browser.versions.android)

            {

                window.location.href = androidURL;

            }