据我所知，您无法通过浏览器检查应用程序是否已安装.

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，则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结果，则永远不会执行第一行.

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

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