phaser/examples/input/keyboard justpressed.js

var game = new Phaser.Game(800, 600, Phaser.AUTO, 'phaser-example', { preload: preload, create: create, update: update });

var phaser;

function preload() {

    game.load.image('phaser', 'assets/sprites/phaser-dude.png');

}

function create() {

    game.stage.backgroundColor = '#736357';

    phaser = game.add.sprite(300, 300, 'phaser');

}

function update() {

    if (game.input.keyboard.justPressed(Phaser.Keyboard.UP))
    {
        phaser.y--;
    }

    if (game.input.keyboard.justPressed(Phaser.Keyboard.DOWN))
    {
        phaser.y++;
    }

}