判断手机是否有app，没有打开下载地址

if (navigator.userAgent.match(/(iPhone|iPod|iPad);?/i)) {
                                    window.location.href = "com.baidu.tieba://";//ios app协议
                                    window.setTimeout(function () {
                                        window.location.href = "https://itunes.apple.com/cn/app/id477927812";
                                    }, 2000)
                                } else if (navigator.userAgent.match(/android/i)) {
                                    window.location.href = "com.baidu.tieba://app";//android app协议
                                    window.setTimeout(function () {
                                        window.location.href = "https://****.apk";//android 下载地址
                                    }, 2000)
                                }