<canvas id="game" width="568" height="320"></canvas>
 
 
var GAME = {
    settings: {
        canvas: document.getElementById('game'),
        context: this.canvas.getContext('2d'),
        gameWidth: this.context.width,
        gameHeight: this.context.height
    }
};
       
var GAME = {
    settings: {
        canvas: document.getElementById('game');
    }
};
GAME.settings.context = GAME.settings.canvas.getContext('2d');
GAME.settings.gameWidth = GAME.settings.context.width;
GAME.settings.gameHeight = GAME.settings.context.height;
       
var GAME = (function(){
   var s = {};
   s.canvas = document.getElementById('game');
   s.context = s.canvas.getContext('2d');
   s.gameWidth = s.context.width;
   s.gameHeight = s.context.height;
   return { settings : s}
})();