在网页上创建一个简单的贪吃蛇游戏,需要使用HTML、CSS和JavaScript。以下是一个简化的示例代码,展示了如何在20行代码中实现一个基本的贪吃蛇游戏:,,``html,,,,,,贪吃蛇游戏,, canvas {, border: 1px solid black;, },,,,,, const canvas = document.getElementById('gameCanvas');, const ctx = canvas.getContext('2d');,, let snake = [{x: 50, y: 50}];, let food = {x: Math.floor(Math.random() * 40) * 10, y: Math.floor(Math.random() * 40) * 10};, let direction = 'right';,, function drawSnake() {, ctx.fillStyle = 'green';, snake.forEach(segment => {, ctx.fillRect(segment.x, segment.y, 10, 10);, });, },, function drawFood() {, ctx.fillStyle = 'red';, ctx.fillRect(food.x, food.y, 10, 10);, },, function updateGame() {, const head = {x: snake[0].x, y: snake[0].y};,, switch (direction) {, case 'up':, head.y -= 10;, break;, case 'down':, head.y += 10;, break;, case 'left':, head.x -= 10;, break;, case 'right':, head.x += 10;, break;, },, snake.unshift(head);,, if (head.x === food.x && head.y === food.y) {, food = {x: Math.floor(Math.random() * 40) * 10, y: Math.floor(Math.random() * 40) * 10};, } else {, snake.pop();, },, drawFood();, drawSnake();,, // Game over conditions, if (head.x< 0 || head.x >= canvas.width || head.y< 0 || head.y >= canvas.height || snake.some(segment => segment.x === head.x && segment.y === head.y)) {, clearInterval(gameLoop);, alert('Game Over!');, }, },, function startGame() {, gameLoop = setInterval(updateGame, 100);, },, startGame();, document.addEventListener('keydown', e => {, switch (e.key) {, case 'ArrowUp':, if (direction !== 'down') direction = 'up';, break;, case 'ArrowDown':, if (direction !== 'up') direction = 'down';, break;, case 'ArrowLeft':, if (direction !== 'right') direction = 'left';, break;, case 'ArrowRight':, if (direction !== 'left') direction = 'right';, break;, }, });,,,,
``,,这个代码片段定义了一个简单的贪吃蛇游戏,包括一个画布、一个移动的蛇和一个食物。用户可以通过键盘控制蛇的方向,并且当蛇吃到食物时,会增长一节。如果蛇撞到边界或自身,游戏结束。
程序员web前端-java-网页 *** -20行代码怎样编辑贪吃蛇小游戏?<!doctype html>
<html>
<body>
<canvas id="can" width="400" height="400" style="background: Black"></canvas>
<script>
var sn = [ 42, 41 ], dz = 43, fx = 1, n, ctx = document.getElementById("can").getContext("2d");
function draw(t, c) {
ctx.fillStyle = c;
ctx.fillRect(t % 20 * 20 + 1, ~~(t / 20) * 20 + 1, 18, 18);
}
document.onkeydown = function(e) {
fx = sn[1] - sn[0] == (n = [ -1, -20, 1, 20 ][(e || event).keyCode - 37] || fx) ? fx : n
};
!function() {
sn.unshift(n = sn[0] + fx);
if (sn.indexOf(n, 1) > 0 || n<0||n>399 || fx == 1 && n % 20 == 0 || fx == -1 && n % 20 == 19)
return alert("GAME OVER");
draw(n, "Lime");
if (n == dz) {
while (sn.indexOf(dz = ~~(Math.random() * 400)) >= 0);
draw(dz, "Yellow");
} else
draw(sn.pop(), "Black");
setTimeout(arguments.callee, 130);
}();
</script>
</body>
</html>