title: exit button event in phonegap for iOS?
body: <p>is there any event Listener that calls when we press on iPhone close button in phonegap?</p>
  
  <p>so that we can do final task when application close.</p>
  
  <p>i have found that onunload method will call when webpage redirect but it want work here.</p>
  
  <p>please help me.</p>