js--window.postMessage

The parent page subpages want to send a message:

var iframe=document.getElementById('centerFormIframe_iframe').contentWindow;
iframe.postMessage('full','*');

　　

Subpages send a message to the parent page:

window.parent.postMessage('full','*');

　　

monitor:

window.addEventListener('message',function(e){
  if(e.data=='exit'){}
})