h5页面判断是否安装APP，如果安装就拉起APP，否则就下载

if (navigator.userAgent.match(/(iPhone|iPod|iPad);?/i)) {
                    var loadDateTime = new Date();
                    window.location = "...";//schema链接或者universal link
                    window.setTimeout(function() { //如果没有安装app,便会执行setTimeout跳转下载页
                        var timeOutDateTime = new Date();
                        if (timeOutDateTime - loadDateTime < 5000) {
                            window.location = "..."; //ios下载地址  
                        } else {
                            window.close();
                        }
                    }, 500);
                    
                } else if (navigator.userAgent.match(/android/i)) {
                    var state = null;
                    try {
                        window.location = '...'; //schema链接或者universal link
                        window.setTimeout(function() {
                            window.location = "..."; //android下载地址  
                        }, 500);
                    } catch (e) {}
                }
            },

因为h5页面无法直接获取APP是否安装，所以只能够间接进行判断，就是通过跳转的方式，如果跳转到APP成功，则会直接调转，如果不成功就弹出APP的下载链接 其中schema链接需要自己在项目里面进行配置

附上uni-app的官网说明链接，https://ask.dcloud.net.cn/article/409，希望能给在摸索中的码友些一点点帮助哦。

方法：通过itms-services://?action=download-manifest&url=https://xxxxx.plist 链接方式下载

plist文件（必须为https协议地址）

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE plist PUBLIC '-//Apple//DTD PLIST 1.0//EN' 'http://www.apple.com/DTDs/PropertyList-1.0.dtd'>
<plist version='1.0'>
<dict>
    <key>items</key>
    <array>
        <dict>
            <key>assets</key>
            <array>
                <dict>
                    <key>kind</key>
                    <string>software-package</string>
                    <key>url</key>
                    <string>https://xxxxxxx/pms.ipa</string> //ipa资源地址(https协议）
                </dict>
                <dict>
                    <key>kind</key>
                    <string>display-image</string>
                    <key>needs-shine</key>
                    <true/>
                    <key>url</key>
                    <string>https://xxxxxxxx/app_icon.png</string> //图标地址
                </dict>
                <dict>
                    <key>kind</key>
                    <string>full-size-image</string>
                    <key>needs-shine</key>
                    <true/>
                    <key>url</key>
                    <string>https://xxxxxxxx/app_icon.png</string> //完整尺寸图标地址
                </dict>
            </array>
            <key>metadata</key>
            <dict>
                <key>bundle-identifier</key>
                <string>xxxx</string> // 包名
                <key>bundle-version</key>
                <string>1.0.0</string> //版本号
                <key>kind</key>
                <string>software</string>
                <key>title</key>
                <string>xxx</string> // 软件名
            </dict>
        </dict>
    </array>
</dict>
</plist>

    // 3.下载成功，开始安装,兼容8.0安装位置来源的权限
    public static void installApkO(Activity context, String downloadApkPath) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            //是否有安装位置来源的权限
            boolean haveInstallPermission = context.getPackageManager().canRequestPackageInstalls();
            if (haveInstallPermission) {
//                L.i("8.0手机已经拥有安装未知来源应用的权限，直接安装！");
                Utils.installApk(context, downloadApkPath);
            } else {
                Uri packageUri = Uri.parse("package:" + context.getPackageName());
                Intent intent = new Intent(Settings.ACTION_MANAGE_UNKNOWN_APP_SOURCES, packageUri);
                context.startActivityForResult(intent, 10086);
            }
        } else {
            Utils.installApk(context, downloadApkPath);
        }
    }

public static void installApk(Context context, String downloadApk) {
        Intent intent = new Intent(Intent.ACTION_VIEW);
        File file = new File(downloadApk);
//        L.i("安装路径=="+downloadApk);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            Uri apkUri = FileProvider.getUriForFile(context, BaseApplication.getInstace().getApplication().getPackageName() + ".fileProvider", file);
            intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
            intent.setDataAndType(apkUri, "application/vnd.android.package-archive");
        } else {
            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            Uri uri = Uri.fromFile(file);
            intent.setDataAndType(uri, "application/vnd.android.package-archive");
        }
        context.startActivity(intent);

    }

需要配置

<provider
    android:name="com.tencent.bugly.beta.utils.BuglyFileProvider"
    android:authorities="${applicationId}.fileProvider"
    android:exported="false"
    android:grantUriPermissions="true"
    tools:replace="name,authorities,exported,grantUriPermissions">
    <meta-data
        android:name="android.support.FILE_PROVIDER_PATHS"
        android:resource="@xml/provider_paths"
        tools:replace="name,resource" />
</provider>

文件provider_paths.xml

<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- /storage/emulated/0/Download/${applicationId}/.beta/apk-->
    <external-path name="beta_external_path" path="Download/"/>
    <!--/storage/emulated/0/Android/data/${applicationId}/files/apk/-->
    <external-path name="beta_external_files_path" path="Android/data/"/>
</paths>





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