Phaser Movement

script.js

var game = new Phaser.Game(
  200, //The width in pixels
  200, //The height in pixels
  Phaser.AUTO, //The render system
  "phaser", //The element
  {
    preload: preload, // The preload function
    create: create, // The create function
    update: update // The update function
  }
);

// Create the variable outside of any one function scope
var sprite;

function preload() {}

function create() {
  sprite = game.add.sprite(
    50, // The x position
    50, // The y position
    'sprite' // The image cache-key
  );
}

function update() {
  // Check if the player is pressing Keyboard.LEFT
  if (game.input.keyboard.isDown(Phaser.Keyboard.LEFT)) {
    // If Keyboard.LEFT is down (being pressed),
    //  move 'sprite' 4 pixels to the left
    sprite.x -= 4;
  }
}