On window leave js

window.onLeave = (f, single = false) => {
	var showed = false

	var fn = () => {
		if (single ? !showed : true) {
			if (single) showed = true;
			f()
		}
	}

	document.body.addEventListener('mouseout', e => {
		let y = window.pageYOffset
		let x = window.pageXOffset

		if ((e.pageX < 1 || e.pageY < 50)) fn();

		setTimeout(() => {
			if ((e.pageX >= window.innerWidth - 50 && x == window.pageXOffset) || (e.pageY <= 50 && y == window.pageYOffset)) fn();
		}, 200)
	})

	window.addEventListener('beforeunload', e => {
		fn()
		return false
	})
}