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| <!DOCTYPE html>
<html>
<head>
<title>贪吃蛇游戏</title>
<style>
#game-board {
width: 600px;
height: 600px;
border: 1px solid #000;
position: relative;
margin: 0 auto;
}
.snake-node {
width: 20px;
height: 20px;
background-color: #000;
position: absolute;
}
#food {
width: 20px;
height: 20px;
background-color: red;
position: absolute;
}
#score {
text-align: center;
margin-top: 20px;
}
#pause-btn {
display: block;
margin: 10px auto;
}
#restart-btn {
display: block;
margin: 10px auto;
}
</style>
</head>
<body>
<h1 style="text-align: center;">贪吃蛇游戏</h1>
<div id="game-board"></div>
<div id="score">得分：<span id="score-value">0</span></div>
<button id="pause-btn">暂停</button>
<button id="restart-btn">重新开始</button>
<script>
var gameBoard = document.getElementById('game-board');
var scoreDisplay = document.getElementById('score-value');
var pauseBtn = document.getElementById('pause-btn');
var restartBtn = document.getElementById('restart-btn');
var gridSize = 30; // 网格大小
var snakeSize = 20; // 蛇身大小
var snakeSpeed = 200; // 蛇移动速度（毫秒）
var snakeDirection = 'right'; // 蛇移动方向
var snake = [{ x: 0, y: 0 }]; // 蛇的初始位置
var food = null; // 食物的位置
var score = 0; // 得分
var gameInterval = null; // 游戏循环定时器
// 初始化游戏
function initializeGame() {
createSnake();
generateFood();
gameInterval = setInterval(moveSnake, snakeSpeed);
pauseBtn.addEventListener('click', togglePause);
restartBtn.addEventListener('click', restartGame);
document.addEventListener('keydown', changeDirection);
}
// 创建蛇
function createSnake() {
for (var i = 0; i < snake.length; i++) {
var node = document.createElement('div');
node.className = 'snake-node';
node.style.left = snake[i].x + 'px';
node.style.top = snake[i].y + 'px';
gameBoard.appendChild(node);
}
}
// 生成食物
function generateFood() {
var x = getRandomPosition();
var y = getRandomPosition();
while (isOverlapping(x, y)) {
x = getRandomPosition();
y = getRandomPosition();
}
food = { x: x, y: y };
var foodNode = document.createElement('div');
foodNode.id = 'food';
foodNode.style.left = food.x + 'px';
foodNode.style.top = food.y + 'px';
gameBoard.appendChild(foodNode);
}
// 获取一个随机位置
function getRandomPosition() {
return Math.floor(Math.random() * gridSize) * snakeSize;
}
// 判断位置是否与蛇或食物重叠
function isOverlapping(x, y) {
for (var i = 0; i < snake.length; i++) {
if (snake[i].x === x && snake[i].y === y) {
return true;
}
}
if (food && food.x === x && food.y === y) {
return true;
}
return false;
}
// 移动蛇
function moveSnake() {
var newHead = { x: snake[0].x, y: snake[0].y };
switch (snakeDirection) {
case 'right':
newHead.x += snakeSize;
break;
case 'left':
newHead.x -= snakeSize;
break;
case 'up':
newHead.y -= snakeSize;
break;
case 'down':
newHead.y += snakeSize;
break;
}
// 判断是否吃到食物
if (food && food.x === newHead.x && food.y === newHead.y) {
score++;
scoreDisplay.textContent = score;
gameBoard.removeChild(document.getElementById('food'));
generateFood();
} else {
snake.pop();
}
// 判断是否游戏结束
if (newHead.x < 0 || newHead.x >= gridSize * snakeSize ||
newHead.y < 0 || newHead.y >= gridSize * snakeSize ||
isOverlapping(newHead.x, newHead.y)) {
clearInterval(gameInterval);
alert('游戏结束！得分：' + score + '\n点击"重新开始"按钮重新开始游戏。');
return;
}
snake.unshift(newHead);
updateSnakePosition();
}
// 更新蛇的位置
function updateSnakePosition() {
var snakeNodes = document.getElementsByClassName('snake-node');
while (snakeNodes.length > 0) {
gameBoard.removeChild(snakeNodes[0]);
}
for (var i = 0; i < snake.length; i++) {
var node = document.createElement('div');
node.className = 'snake-node';
node.style.left = snake[i].x + 'px';
node.style.top = snake[i].y + 'px';
gameBoard.appendChild(node);
}
}
// 切换暂停/继续游戏
function togglePause() {
if (gameInterval) {
clearInterval(gameInterval);
gameInterval = null;
pauseBtn.textContent = '继续';
} else {
gameInterval = setInterval(moveSnake, snakeSpeed);
pauseBtn.textContent = '暂停';
}
}
// 重新开始游戏
function restartGame() {
clearInterval(gameInterval);
gameBoard.innerHTML = '';
snake = [{ x: 0, y: 0 }];
score = 0;
scoreDisplay.textContent = score;
snakeDirection = 'right';
initializeGame();
}
// 改变蛇的移动方向
function changeDirection(event) {
switch (event.keyCode) {
case 37:
if (snakeDirection !== 'right') {
snakeDirection = 'left';
}
break;
case 38:
if (snakeDirection !== 'down') {
snakeDirection = 'up';
}
break;
case 39:
if (snakeDirection !== 'left') {
snakeDirection = 'right';
}
break;
case 40:
if (snakeDirection !== 'up') {
snakeDirection = 'down';
}
break;
}
}
// 启动游戏
initializeGame();
</script>
</body>
</html>
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