HTML5完整飛機大戰代碼是一份用HTML5實現的小游戲代碼，它可以用于展示HTML5的一些基本語法和功能。以下是完整的代碼：
<!DOCTYPE html> <html> <head> <title>HTML5 完整飛機大戰代碼</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <link rel="stylesheet" type="text/css" href="style.css"> </head> <body> <canvas id="canvas" width="480" height="720"></canvas> <script src="main.js"></script> </body> </html>
上面的代碼中，我們定義了一個HTML文檔，并添加了標題、meta標簽和樣式表鏈接。此外，還在body標簽中定義了一個canvas元素和一個JavaScript文件的導入語句。
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
var width = canvas.width;
var height = canvas.height;
var player = {
x: width / 2 - 50,
y: height - 100,
width: 100,
height: 100,
speed: 5,
image: new Image()
};
player.image.src = 'res/player.png';
var enemies = [];
var enemySpeed = 1;
function drawPlayer() {
ctx.drawImage(player.image, player.x, player.y, player.width, player.height);
}
function updatePlayer() {
if (keys.isLeft) {
player.x -= player.speed;
} else if (keys.isRight) {
player.x += player.speed;
}
if (player.x< 0) {
player.x = 0;
} else if (player.x + player.width >width) {
player.x = width - player.width;
}
}
function drawEnemies() {
for (var i = 0; i< enemies.length; i++) {
var enemy = enemies[i];
ctx.drawImage(enemy.image, enemy.x, enemy.y, enemy.width, enemy.height);
}
}
function updateEnemies() {
for (var i = 0; i< enemies.length; i++) {
var enemy = enemies[i];
enemy.y += enemySpeed;
if (enemy.y >height) {
enemies.splice(i, 1);
i--;
}
}
}
function generateEnemies() {
var enemy = {
x: Math.random() * (width - 50),
y: -50,
width: 50,
height: 50,
speed: enemySpeed,
image: new Image()
};
enemy.image.src = 'res/enemy.png';
enemies.push(enemy);
}
setInterval(generateEnemies, 1000);
function clearCanvas() {
ctx.clearRect(0, 0, canvas.width, canvas.height);
}
function draw() {
clearCanvas();
drawPlayer();
drawEnemies();
}
function update() {
updatePlayer();
updateEnemies();
}
function gameLoop() {
draw();
update();
requestAnimationFrame(gameLoop);
}
gameLoop();以上是JavaScript部分的代碼，主要實現了游戲的邏輯和運行。在此代碼中，我們首先獲取了canvas元素和其上下文，然后定義了玩家、敵人和游戲循環函數。在循環函數中，我們不斷地調用繪制和更新函數來實現游戲的運行。同時，我們也添加了敵人產生的定時器，每秒鐘產生一個敵人來增加游戲難度。
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