Singleton and Window eventlisteners

var App = {};

App = function(){

	this.mouse;
	this.SCREEN_WIDTH = 100;
	this.SCREEN_HEIGHT = 100;
	this.init();

}
App.prototype = {
	init:function(){
		var me = this;
		
		window.addEventListener( 'mousemove', function(e){
			this.mouse = {x: e.clientX - this.SCREEN_WIDTH/2, y: e.clientY - this.SCREEN_HEIGHT/2};
			me.render();
		});
	
	},
	render:function(){
		console.log(this.mouse.x);
	}
}
var prog = new App();