브라우저 종료시 실행

var closing_window = false;
 	$(window).on('focus', function () {
		closing_window = false;
	 	//if the user interacts with the window, then the window is not being
	 	//closed
 });

 $(window).on('blur', function () {

	 closing_window = true;
	 if (!document.hidden) { //when the window is being minimized
		 closing_window = false;
	 }
	 $(window).on('resize', function (e) { //when the window is being maximized
		 closing_window = false;
	 });
	 $(window).off('resize'); //avoid multiple listening
 });

 $('html').on('mouseleave', function () {
	 closing_window = true;
	 //if the user is leaving html, we have more reasons to believe that he's
	 //leaving or thinking about closing the window
 });

 $('html').on('mouseenter', function () {
	 closing_window = false;
	 //if the user's mouse its on the page, it means you don't need to logout
	 //them, didn't it?
 });

 $(document).on('keydown', function (e) {

	 if (e.keyCode == 91 || e.keyCode == 18) {
		 closing_window = false; //shortcuts for ALT+TAB and Window key
	 }

	 if (e.keyCode == 116 || (e.ctrlKey && e.keyCode == 82)) {
		 closing_window = false; //shortcuts for F5 and CTRL+F5 and CTRL+R
	 }
 });

 // Prevent logout when clicking in a hiperlink
 $(document).on("click", "a", function () {
	 closing_window = false;
 });

 // Prevent logout when clicking in a button (if these buttons rediret to some page)
 $(document).on("click", "button", function () {
	 closing_window = false;

 });
 // Prevent logout when submiting
 $(document).on("submit", "form", function () {
	 closing_window = false;
 });
 // Prevent logout when submiting
 $(document).on("click", "input[type=submit]", function () {
	 closing_window = false;
 });

 var toDoWhenClosing = function() {
	 $.ajax({
		 type: "POST",
		 url: "/logout.php",
		 async: false
	 });
	 return;
 };

window.addEventListener("beforeunload", function (e) {
	if (closing_window) {
		toDoWhenClosing();
	}
});