Cobalah sendiri - HTML Games controllers

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
<style>
canvas {
   border:1px solid #d3d3d3;
   background-color: #f1f1f1;
}
</style>
</head>
<body onload="startGame()">
<script>

var myGamePiece;

function startGame() {
   myGamePiece = new component(30, 30, "red", 10, 120);
   myGameArea.start();
}

var myGameArea = {
   canvas : document.createElement("canvas"),
   start : function() {
   this.canvas.width = 480;
   this.canvas.height = 270;
   this.context = this.canvas.getContext("2d");
   document.body.insertBefore(this.canvas, document.body.childNodes[0]);
   this.interval = setInterval(updateGameArea, 20);
   },
   clear : function() {
   this.context.clearRect(0, 0, this.canvas.width, this.canvas.height);
   }
}

function component(width, height, color, x, y) {
   this.width = width;
   this.height = height;
   this.speedX = 0;
   this.speedY = 0;
   this.x = x;
   this.y = y;
   this.update = function() {
   ctx = myGameArea.context;
   ctx.fillStyle = color;
   ctx.fillRect(this.x, this.y, this.width, this.height);
   }
   this.newPos = function() {
   this.x += this.speedX;
   this.y += this.speedY;
   }
}

function updateGameArea() {
   myGameArea.clear();
   myGamePiece.newPos();
   myGamePiece.update();
}

function moveup() {
   myGamePiece.speedY -= 1;
}

function movedown() {
   myGamePiece.speedY += 1;
}

function moveleft() {
   myGamePiece.speedX -= 1;
}

function moveright() {
   myGamePiece.speedX += 1;
}
</script>
<div style="text-align:center;width:480px;">
  <button onclick="moveup()">UP</button><br><br>
  <button onclick="moveleft()">LEFT</button>
  <button onclick="moveright()">RIGHT</button><br><br>
  <button onclick="movedown()">DOWN</button>
</div>

<p>If you click a button the red square will start moving. Click the same button many times, and it will move faster and faster.</p>
</body>
</html>

var myGamePiece;

function startGame() {
    myGamePiece = new component(30, 30, "red", 10, 120);
    myGameArea.start();
}

function updateGameArea() {
    myGameArea.clear();
    myGamePiece.newPos();    
    myGamePiece.update();
}

function moveup() {
    myGamePiece.speedY -= 1; 
}

function movedown() {
    myGamePiece.speedY += 1; 
}

function moveleft() {
    myGamePiece.speedX -= 1; 
}

function moveright() {
    myGamePiece.speedX += 1; 
}
</script>
<div style="text-align:center;width:480px;">
  <button onclick="moveup()">UP</button><br><br>
  <button onclick="moveleft()">LEFT</button>
  <button onclick="moveright()">RIGHT</button><br><br>
  <button onclick="movedown()">DOWN</button>
</div>

<p>If you click a button the red square will start moving. Click the same button many times, and it will move faster and faster.</p>
</body>
</html>