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Add Snake game webpage #2

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Add Snake game webpage #2

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281 changes: 281 additions & 0 deletions index.html
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Original file line number Diff line number Diff line change
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<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>贪吃蛇小游戏</title>
<style>
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
min-height: 100vh;
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
background: linear-gradient(135deg, #1e3c72, #2a5298);
font-family: -apple-system, "Segoe UI", Roboto, sans-serif;
color: #fff;
padding: 20px;
}
h1 { margin-bottom: 10px; font-size: 28px; letter-spacing: 2px; }
.info {
display: flex;
gap: 30px;
margin-bottom: 12px;
font-size: 18px;
}
.info span { font-weight: bold; color: #ffd54f; }
canvas {
background: #0f1d3a;
border: 3px solid #ffd54f;
border-radius: 8px;
box-shadow: 0 8px 30px rgba(0, 0, 0, 0.5);
touch-action: none;
}
.controls {
margin-top: 16px;
display: flex;
gap: 12px;
flex-wrap: wrap;
justify-content: center;
}
button {
padding: 10px 22px;
font-size: 15px;
border: none;
border-radius: 6px;
background: #ffd54f;
color: #1e3c72;
font-weight: bold;
cursor: pointer;
transition: transform 0.15s, background 0.15s;
}
button:hover { background: #ffca28; transform: translateY(-2px); }
button:active { transform: translateY(0); }
.hint {
margin-top: 14px;
font-size: 13px;
opacity: 0.7;
text-align: center;
}
.overlay {
position: fixed;
inset: 0;
background: rgba(0, 0, 0, 0.6);
display: none;
align-items: center;
justify-content: center;
flex-direction: column;
z-index: 10;
}
.overlay.show { display: flex; }
.overlay h2 { font-size: 36px; margin-bottom: 12px; color: #ffd54f; }
.overlay p { font-size: 18px; margin-bottom: 20px; }
</style>
</head>
<body>
<h1>贪吃蛇</h1>
<div class="info">
分数: <span id="score">0</span>
最高: <span id="best">0</span>
</div>
<canvas id="game" width="400" height="400"></canvas>
<div class="controls">
<button id="startBtn">开始</button>
<button id="pauseBtn">暂停</button>
<button id="resetBtn">重置</button>
</div>
<div class="hint">使用方向键 / WASD 控制方向,空格暂停</div>

<div class="overlay" id="overlay">
<h2 id="overlayTitle">游戏结束</h2>
<p id="overlayText">点击「开始」再来一局</p>
</div>

<script>
(() => {
const canvas = document.getElementById('game');
const ctx = canvas.getContext('2d');
const scoreEl = document.getElementById('score');
const bestEl = document.getElementById('best');
const overlay = document.getElementById('overlay');
const overlayTitle = document.getElementById('overlayTitle');
const overlayText = document.getElementById('overlayText');

const CELL = 20;
const COLS = canvas.width / CELL;
const ROWS = canvas.height / CELL;

let snake, dir, nextDir, food, score, best, running, timer, speed;

best = parseInt(localStorage.getItem('snake_best') || '0', 10);
bestEl.textContent = best;

function init() {
snake = [{ x: 10, y: 10 }, { x: 9, y: 10 }, { x: 8, y: 10 }];
dir = { x: 1, y: 0 };
nextDir = { x: 1, y: 0 };
score = 0;
speed = 130;
placeFood();
scoreEl.textContent = score;
draw();
}

function placeFood() {
while (true) {
const f = {
x: Math.floor(Math.random() * COLS),
y: Math.floor(Math.random() * ROWS),
};
if (!snake.some(s => s.x === f.x && s.y === f.y)) {
food = f;
return;
}
}
}

function step() {
if ((nextDir.x !== -dir.x || nextDir.y !== -dir.y)) {
dir = nextDir;
}
const head = { x: snake[0].x + dir.x, y: snake[0].y + dir.y };

if (head.x < 0 || head.x >= COLS || head.y < 0 || head.y >= ROWS) {
return gameOver();
}
if (snake.some(s => s.x === head.x && s.y === head.y)) {
return gameOver();
}

snake.unshift(head);
if (head.x === food.x && head.y === food.y) {
score += 10;
scoreEl.textContent = score;
if (speed > 60) speed -= 2;
placeFood();
restartTimer();
} else {
snake.pop();
}
draw();
}

function draw() {
ctx.fillStyle = '#0f1d3a';
ctx.fillRect(0, 0, canvas.width, canvas.height);

ctx.strokeStyle = 'rgba(255, 255, 255, 0.04)';
for (let i = 1; i < COLS; i++) {
ctx.beginPath();
ctx.moveTo(i * CELL, 0);
ctx.lineTo(i * CELL, canvas.height);
ctx.stroke();
}
for (let i = 1; i < ROWS; i++) {
ctx.beginPath();
ctx.moveTo(0, i * CELL);
ctx.lineTo(canvas.width, i * CELL);
ctx.stroke();
}

ctx.fillStyle = '#ff5252';
ctx.beginPath();
ctx.arc(
food.x * CELL + CELL / 2,
food.y * CELL + CELL / 2,
CELL / 2 - 2, 0, Math.PI * 2
);
ctx.fill();

snake.forEach((seg, i) => {
ctx.fillStyle = i === 0 ? '#ffd54f' : `hsl(${50 + i * 4}, 80%, ${60 - Math.min(i, 20)}%)`;
ctx.fillRect(seg.x * CELL + 1, seg.y * CELL + 1, CELL - 2, CELL - 2);
});
}

function gameOver() {
running = false;
clearInterval(timer);
if (score > best) {
best = score;
localStorage.setItem('snake_best', String(best));
bestEl.textContent = best;
overlayTitle.textContent = '新纪录!';
} else {
overlayTitle.textContent = '游戏结束';
}
overlayText.textContent = `本局得分 ${score} 分`;
overlay.classList.add('show');
}

function restartTimer() {
clearInterval(timer);
timer = setInterval(step, speed);
}

function start() {
if (running) return;
overlay.classList.remove('show');
if (!snake) init();
running = true;
restartTimer();
}

function pause() {
if (!running) return;
running = false;
clearInterval(timer);
}

function reset() {
pause();
overlay.classList.remove('show');
init();
}

document.getElementById('startBtn').addEventListener('click', start);
document.getElementById('pauseBtn').addEventListener('click', pause);
document.getElementById('resetBtn').addEventListener('click', () => { reset(); start(); });

const keyMap = {
ArrowUp: { x: 0, y: -1 }, w: { x: 0, y: -1 }, W: { x: 0, y: -1 },
ArrowDown: { x: 0, y: 1 }, s: { x: 0, y: 1 }, S: { x: 0, y: 1 },
ArrowLeft: { x: -1, y: 0 }, a: { x: -1, y: 0 }, A: { x: -1, y: 0 },
ArrowRight: { x: 1, y: 0 }, d: { x: 1, y: 0 }, D: { x: 1, y: 0 },
};

window.addEventListener('keydown', (e) => {
if (e.key === ' ') {
e.preventDefault();
running ? pause() : start();
return;
}
const d = keyMap[e.key];
if (d) {
e.preventDefault();
nextDir = d;
}
});

let touchStart = null;
canvas.addEventListener('touchstart', (e) => {
touchStart = { x: e.touches[0].clientX, y: e.touches[0].clientY };
});
canvas.addEventListener('touchend', (e) => {
if (!touchStart) return;
const dx = e.changedTouches[0].clientX - touchStart.x;
const dy = e.changedTouches[0].clientY - touchStart.y;
if (Math.abs(dx) > Math.abs(dy)) {
nextDir = dx > 0 ? { x: 1, y: 0 } : { x: -1, y: 0 };
} else {
nextDir = dy > 0 ? { x: 0, y: 1 } : { x: 0, y: -1 };
}
touchStart = null;
});

init();
})();
</script>
</body>
</html>
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