如何检查iPhone上的网页是否安装了应用程序？ [英] How to check if an app is installed from a web-page on an iPhone?
问题描述
我想创建一个网页，如果iPhone没有安装应用程序，该网页会将iPhone重定向到应用程序商店，但如果iPhone安装了应用程序，我希望它打开应用程序。
I want to create a web-page, a page that will redirect an iPhone to the app-store if the iPhone does not have the application installed, but if the iPhone has the app installed I want it to open the application.
我已经在iPhone应用程序中实现了一个自定义URL，所以我有一个应用程序的URL，如下所示：
I have already implemented a custom url in the iPhone application so I have an url for the application that is something like:
myapp://
如果这个网址无效，我希望页面重定向到应用商店。
这可能吗？
And if this url is invalid, I want the page to redirect to the app store. Is this possible at all?
如果我没有在手机上安装应用程序并在safari中写下myapp：// url，那么我get是一条错误消息。
If I don't have the application installed on the phone and write the myapp:// url in safari, all I get is an error message.
即使存在javascript的丑陋黑客，我真的很想知道吗？
Even if there exists an ugly hack with javascript I would really like to know?
推荐答案
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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