thing.js

// Create our 'main' state that will contain the game
var mainState = {
    preload: function() { 
        // This function will be executed at the beginning    
        // That's where we load the images and sounds 
    },

    create: function() { 
        // This function is called after the preload function     
        // Here we set up the game, display sprites, etc.  
    },

    update: function() {
        // This function is called 60 times per second    
        // It contains the game's logic   
    },
};

// Initialize Phaser, and create a 400px by 490px game
var game = new Phaser.Game(400, 490);

// Add the 'mainState' and call it 'main'
game.state.add('main', mainState); 

// Start the state to actually start the game
game.state.start('main');