What event fires when a WebKit WebApp is “terminated”

问题

I am in the process of developing a Web App for iOS and am using the DOMApplicationCache. I know that Web Apps can not run in the background, but I still would like to simulate a resume of the app when the user switches to another app and returns to the web app later.

In order to do this I at least need to record when the Web App terminates/unloads. But the window.unload does not seem to fire.

Does anybody have an idea how to catch the termination of a WebApp running?

PS: on a related question, where does the console.log go when apple-mobile-web-app-capable is yes?

回答1:

You can use the "pageshow" event to detect when the app has resumed. This event will fire when user returns to your app from a different safari tab. It will also fire when user clicks the home button and then comes back to the app by clicking on safari button

     <script>
    window.addEventListener("pageshow", function(){
        alert("page shown");
    }, false);
  </script>

I have tested this on the iOS simulator and its working as I described above.

回答2:

I have an answer. It's not what we were hoping for.

The technical definition of unload from http://www.w3.org/TR/DOM-Level-2-Events/events.html is:

The unload event occurs when the DOM implementation removes a document from a window or frame. This event is valid for BODY and FRAMESET elements.

I also got a reply from some in the know at Apple: "Unfortunately, I haven't been able to find an event that fires when the Home button is clicked! I think the most appropriate event for this might be the pagehide event. This event actually does fire in Safari on iOS when you switch to the "tabs" view to open a new page, but not when you click the home screen icon :-("

来源：https://stackoverflow.com/questions/4401764/what-event-fires-when-a-webkit-webapp-is-terminated