金颢轩贪吃蛇 - 科学教育

<!DOCTYPE html>
<html>
<head>
<title>贪吃蛇</title>
<style>
#gameCanvas {
border: 1px solid black;
}
</style>
</head>
<body>
<canvas id="gameCanvas" width="400" height="400"></canvas>
<script>
const canvas = document.getElementById('gameCanvas');
const ctx = canvas.getContext('2d');
const snakeSize = 10;
let snake = [{ x: 200, y: 200 }];
let dx = 0;
let dy = -snakeSize;
function drawSnake() {
snake.forEach(segment => {
ctx.fillStyle = 'green';
ctx.fillRect(segment.x, segment.y, snakeSize, snakeSize);
});
}
function moveSnake() {
const head = { x: snake[0].x + dx, y: snake[0].y + dy };
snake.unshift(head);
snake.pop();
}
function clearCanvas() {
ctx.clearRect(0, 0, canvas.width, canvas.height);
}
function gameLoop() {
clearCanvas();
moveSnake();
drawSnake();
setTimeout(gameLoop, 100);
}
document.addEventListener('keydown', event => {
const key = event.key;
switch (key) {
case 'ArrowUp':
dx = 0;
dy = -snakeSize;
break;
case 'ArrowDown':
dx = 0;
dy = snakeSize;
break;
case 'ArrowLeft':
dx = -snakeSize;
dy = 0;
break;
case 'ArrowRight':
dx = snakeSize;
dy = 0;
break;
}
});
gameLoop();
</script>
</body>
</html>

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ctx.fillStyle = 'lime';

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<style>
body {
color: green;
}
</style>

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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>简易飞机大作战</title>
<style>
body {
margin: 0;
background: #000;
overflow: hidden;
color: white;
font-family: Arial, sans-serif;
text-align: center;
}
canvas {
background: #111;
display: block;
margin: 20px auto;
border: 2px solid #0f0;
}
</style>
</head>
<body>
<h1>简易飞机大作战</h1>
<canvas id="gameCanvas" width="400" height="600"></canvas>
<p>左右方向键控制飞机，空格射击</p>
<script>
const canvas = document.getElementById('gameCanvas');
const ctx = canvas.getContext('2d');
// 飞机属性
const planeWidth = 40;
const planeHeight = 40;
let planeX = (canvas.width - planeWidth) / 2;
const planeY = canvas.height - planeHeight - 10;
const planeSpeed = 5;
// 子弹数组
const bullets = [];
const bulletWidth = 5;
const bulletHeight = 10;
const bulletSpeed = 7;
// 敌机数组
const enemies = [];
const enemyWidth = 40;
const enemyHeight = 40;
const enemySpeed = 2;
// 控制状态
let isLeftPressed = false;
let isRightPressed = false;
let isSpacePressed = false;
// 分数
let score = 0;
// 创建敌机
function createEnemy() {
const x = Math.random() * (canvas.width - enemyWidth);
enemies.push({x, y: -enemyHeight});
}
// 监听键盘按下
window.addEventListener('keydown', function(e) {
if (e.code === 'ArrowLeft') isLeftPressed = true;
else if (e.code === 'ArrowRight') isRightPressed = true;
else if (e.code === 'Space') isSpacePressed = true;
});
// 监听键盘松开
window.addEventListener('keyup', function(e) {
if (e.code === 'ArrowLeft') isLeftPressed = false;
else if (e.code === 'ArrowRight') isRightPressed = false;
else if (e.code === 'Space') isSpacePressed = false;
});
// 画飞机
function drawPlane(){
ctx.fillStyle = '#0f0';
// 简单画个三角形当飞机
ctx.beginPath();
ctx.moveTo(planeX + planeWidth/2, planeY);
ctx.lineTo(planeX, planeY + planeHeight);
ctx.lineTo(planeX + planeWidth, planeY + planeHeight);
ctx.closePath();
ctx.fill();
}
// 画子弹
function drawBullets(){
ctx.fillStyle = '#ff0';
bullets.forEach(bullet => {
ctx.fillRect(bullet.x, bullet.y, bulletWidth, bulletHeight);
});
}
// 画敌机
function drawEnemies(){
ctx.fillStyle = '#f00';
enemies.forEach(enemy => {
ctx.fillRect(enemy.x, enemy.y, enemyWidth, enemyHeight);
});
}
// 更新位置
function update(){
// 移动飞机
if(isLeftPressed){
planeX -= planeSpeed;
if(planeX < 0) planeX = 0;
}
if(isRightPressed){
planeX += planeSpeed;
if(planeX > canvas.width - planeWidth) planeX = canvas.width - planeWidth;
}
// 发射子弹
if(isSpacePressed && (bullets.length === 0 || Date.now() - bullets[bullets.length-1].time > 300)){
bullets.push({x: planeX + planeWidth/2 - bulletWidth/2, y: planeY, time: Date.now()});
}
// 子弹飞行
for(let i=bullets.length-1; i>=0; i--){
bullets[i].y -= bulletSpeed;
if(bullets[i].y + bulletHeight < 0){
bullets.splice(i,1);
}
}
// 敌机飞行
for(let i=enemies.length-1; i>=0; i--){
enemies[i].y += enemySpeed;
if(enemies[i].y > canvas.height){
enemies.splice(i,1); // 敌机飞出屏幕消失
}
}
// 子弹和敌机碰撞检测
for(let i=enemies.length-1; i>=0; i--){
let enemy = enemies[i];
for(let j=bullets.length-1; j>=0; j--){
let bullet = bullets[j];
if(bullet.x < enemy.x + enemyWidth &&
bullet.x + bulletWidth > enemy.x &&
bullet.y < enemy.y + enemyHeight &&
bullet.y + bulletHeight > enemy.y){
// 碰撞了
enemies.splice(i, 1);
bullets.splice(j, 1);
score += 10;
break;
}
}
}
// 敌机撞飞机检测 - 游戏结束判定
for(let i=0; i<enemies.length; i++){
let enemy = enemies[i];
if(planeX < enemy.x + enemyWidth &&
planeX + planeWidth > enemy.x &&
planeY < enemy.y + enemyHeight &&
planeY + planeHeight > enemy.y){
alert('游戏结束！你的得分是：' + score);
document.location.reload();
}
}
}
// 画分数
function drawScore(){
ctx.fillStyle='white';
ctx.font = '20px Arial';
ctx.fillText('得分: ' + score, 10, 30);
}
// 主循环
function gameLoop(){
ctx.clearRect(0,0,canvas.width,canvas.height);
update();
drawPlane();
drawBullets();
drawEnemies();
drawScore();
requestAnimationFrame(gameLoop);
}
// 每秒生成一个敌机
setInterval(createEnemy, 1000);
gameLoop();
</script>
</body>
</html>

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document.addEventListener('click', function() {
alert('你点击了页面！');
});

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