使用js和canvas实现简单的网页贪吃蛇小游戏

玩法介绍

点击开始游戏后，使用键盘上的↑↓←→控制移动，吃到食物增加长度，碰到墙壁或碰到自身就游戏结束
在这里插入图片描述

代码实现

代码比较简单，直接阅读注释即可，复制即用

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Snake Game</title><style>body {margin: 0;overflow: hidden;}canvas {display: block;position: absolute;top: 0;left: 0;z-index: 1;background-color: #000;}.start-screen {position: absolute;top: 0;left: 0;width: 100%;height: 100%;background-color: rgba(0, 0, 0, 0.8);color: white;text-align: center;z-index: 2;display: flex;align-items: center;justify-content: center;font-size: 24px;}button {font-size: 24px;padding: 10px 20px;cursor: pointer;}</style>
</head>
<body><div class="start-screen"><h1>Snake Game</h1><button id="startButton">Start Game</button></div><canvas id="gameCanvas" width="800" height="600"></canvas><script>const canvas = document.getElementById('gameCanvas');const ctx = canvas.getContext('2d');// 设置 Canvas 为全屏canvas.width = window.innerWidth;canvas.height = window.innerHeight;// 方块大小const blockSize = 20;// 游戏状态let snake = [{ x: 100, y: 100 }];let food = { x: 200, y: 200 };let direction = 'right';let score = 0;let isRunning = false;// 游戏速度const speed = 100;// 绘制蛇function drawSnake() {ctx.fillStyle = '#0f0';snake.forEach(segment => {ctx.fillRect(segment.x, segment.y, blockSize, blockSize);});}// 绘制食物function drawFood() {ctx.fillStyle = '#f00';ctx.fillRect(food.x, food.y, blockSize, blockSize);}// 检查碰撞function checkCollision() {// 检查蛇是否撞墙if (snake[0].x < 0 || snake[0].x >= canvas.width || snake[0].y < 0 || snake[0].y >= canvas.height) {alert('Game Over!');isRunning = false;return;}// 检查蛇是否撞到自己for (let i = 1; i < snake.length; i++) {if (snake[0].x === snake[i].x && snake[0].y === snake[i].y) {alert('Game Over!');isRunning = false;return;}}// 检查蛇是否吃到食物if (snake[0].x === food.x && snake[0].y === food.y) {score++;placeFood();} else {snake.pop();}}// 放置新的食物function placeFood() {food = {x: Math.floor(Math.random() * (canvas.width / blockSize)) * blockSize,y: Math.floor(Math.random() * (canvas.height / blockSize)) * blockSize};}// 更新游戏状态function update() {if (!isRunning) return;let newX = snake[0].x;let newY = snake[0].y;if (direction === 'left') newX -= blockSize;if (direction === 'right') newX += blockSize;if (direction === 'up') newY -= blockSize;if (direction === 'down') newY += blockSize;snake.unshift({ x: newX, y: newY });checkCollision();}// 渲染游戏画面function draw() {ctx.clearRect(0, 0, canvas.width, canvas.height);drawSnake();drawFood();}// 游戏主循环function gameLoop() {update();draw();setTimeout(gameLoop, speed);}// 键盘事件function handleKeyPress(event) {if (event.key === 'ArrowLeft' && direction !== 'right') direction = 'left';if (event.key === 'ArrowRight' && direction !== 'left') direction = 'right';if (event.key === 'ArrowUp' && direction !== 'down') direction = 'up';if (event.key === 'ArrowDown' && direction !== 'up') direction = 'down';}// 开始按钮事件document.getElementById('startButton').addEventListener('click', () => {const startScreen = document.querySelector('.start-screen');startScreen.style.display = 'none';// 添加键盘事件监听document.addEventListener('keydown', handleKeyPress);isRunning = true;placeFood();gameLoop();});// 游戏结束时移除键盘事件监听window.addEventListener('beforeunload', () => {document.removeEventListener('keydown', handleKeyPress);});</script>
</body>
</html>