Редактор коду W3Schools - Tryit

<!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;
var myObstacle;

function startGame() {
    myGamePiece = new component(30, 30, "red", 10, 120);
    myObstacle  = new component(10, 200, "green", 300, 120);
    myGameArea.start();
}

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

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

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

function moveright() {
    myGamePiece.speedX = 1;
}

function clearmove() {
    myGamePiece.speedX = 0;
    myGamePiece.speedY = 0;
}
</script>
<div style="text-align:center;width:480px;">
  <button onmousedown="moveup()" onmouseup="clearmove()" ontouchstart="moveup()">UP</button><br><br>
  <button onmousedown="moveleft()" onmouseup="clearmove()" ontouchstart="moveleft()">LEFT</button>
  <button onmousedown="moveright()" onmouseup="clearmove()" ontouchstart="moveright()">RIGHT</button><br><br>
  <button onmousedown="movedown()" onmouseup="clearmove()" ontouchstart="movedown()">DOWN</button>
</div>
<p>Уникайте зіткнення з перешкодою, інакше гра зупиниться.</p>
</body>
</html>

​x
 
<!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;var myObstacle;​function startGame() {    myGamePiece = new component(30, 30, "red", 10, 120);    myObstacle  = new component(10, 200, "green", 300, 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);    },    stop : function() {        clearInterval(this.interval);    }}​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;    }    this.crashWith = function(otherobj) {        var myleft = this.x;        var myright = this.x + (this.width);        var mytop = this.y;        var mybottom = this.y + (this.height);        var otherleft = otherobj.x;        var otherright = otherobj.x + (otherobj.width);        var othertop = otherobj.y;        var otherbottom = otherobj.y + (otherobj.height);        var crash = true;        if ((mybottom < othertop) || (mytop > otherbottom) || (myright < otherleft) || (myleft > otherright)) {            crash = false;        }        return crash;    }}​function updateGameArea() {    if (myGamePiece.crashWith(myObstacle)) {        myGameArea.stop();    } else {        myGameArea.clear();        myObstacle.x -= 1;        myObstacle.update();        myGamePiece.newPos();        myGamePiece.update();    }}​function moveup() {    myGamePiece.speedY = -1;}​function movedown() {    myGamePiece.speedY = 1;}​function moveleft() {    myGamePiece.speedX = -1;}​function moveright() {    myGamePiece.speedX = 1;}​function clearmove() {    myGamePiece.speedX = 0;    myGamePiece.speedY = 0;}</script><div style="text-align:center;width:480px;">  <button onmousedown="moveup()" onmouseup="clearmove()" ontouchstart="moveup()">UP</button><br><br>  <button onmousedown="moveleft()" onmouseup="clearmove()" ontouchstart="moveleft()">LEFT</button>  <button onmousedown="moveright()" onmouseup="clearmove()" ontouchstart="moveright()">RIGHT</button><br><br>  <button onmousedown="movedown()" onmouseup="clearmove()" ontouchstart="movedown()">DOWN</button></div><p>Уникайте зіткнення з перешкодою, інакше гра зупиниться.</p></body></html>                