据我所知，您无法通过浏览器检查是否安装了应用程序。

As far as I know you can not, from a browser, check if an app is installed or not.

但是您可以尝试将手机重定向到应用程序，如果没有任何反应，请将手机重定向到指定页面，如下所示：

But you can try redirecting the phone to the app, and if nothing happens redirect the phone to a specified page, like this:

setTimeout(function () { window.location = "https://itunes.apple.com/appdir"; }, 25);
window.location = "appname://";

如果第二行代码给出了结果，那么第一行永远不会被执行。

If the second line of code gives a result then the first row is never executed.

希望这会有所帮助！

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