近年來，隨著互聯網的發展，HTML5技術逐漸被廣泛使用。HTML5支持游戲開發，因此HTML5小游戲也變得越來越流行。下面是一段基于HTML5制作的小游戲代碼：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>HTML5小游戲</title>
</head>
<body>
<canvas id="gameCanvas" width="480" height="320"></canvas>
<script>
var canvas = document.getElementById("gameCanvas");
var ctx = canvas.getContext("2d");
var ballX = canvas.width/2;
var ballY = canvas.height-30;
var ballRadius = 10;
var ballDx = 2;
var ballDy = -2;
function drawBall() {
ctx.beginPath();
ctx.arc(ballX, ballY, ballRadius, 0, Math.PI*2);
ctx.fillStyle = "#0095DD";
ctx.fill();
ctx.closePath();
}
function draw() {
ctx.clearRect(0, 0, canvas.width, canvas.height);
drawBall();
if(ballX + ballDx >canvas.width-ballRadius || ballX + ballDx< ballRadius) {
ballDx = -ballDx;
}
if(ballY + ballDy< ballRadius) {
ballDy = -ballDy;
} else if(ballY + ballDy >canvas.height-ballRadius) {
alert("游戲結束");
document.location.reload();
}
ballX += ballDx;
ballY += ballDy;
}
setInterval(draw, 10);
</script>
</body>
</html>這是一個簡單的“彈球”小游戲，通過<canvas>標簽實現繪圖。其中，drawBall()函數繪制小球，draw()函數循環繪制小球并實現小球在畫布中的運動。通過setInterval()函數來循環執行draw()函數以實現動畫效果。