Custom Event on localStorage

by Anton Kolesnikov

HTML

<button id="btn">Click me!</button>

JavaScript

/*
var originalSetItem = localStorage.setItem; 
localStorage.setItem = function(){
    document.createEvent('Event').initEvent('itemInserted', true, true);
    originalSetItem.apply(this, arguments);
}
*/

var original = window.alert;
window.alert = function() {
	document.createEvent('Event').initEvent('itemInserted', true, true);
  console.log('work');
  original.apply(this, arguments);
}

alert('Yahoo!');

document.getElementById('btn').addEventListener('itemInserted', function() {
	console.log('123'), false
})