JavaScript 贪吃蛇游戏
Posted 乱舞春秋__
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通过javascript，我们可以实现贪吃蛇游戏，具体功能如下：
（1）通过按上下左右键来改变蛇的移动方向
（2）若蛇撞到自己，则游戏结束
（3）蛇移动出地图边缘时，会从地图的另一边进来
（4）长按方向键，蛇加速移动
（5）蛇吃到食物后，重新生成食物
完整代码如下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script>
//地图对象
var Map;
Map = {
width: 990,
height: 600,
backgroundColor: 'rgba(36, 30, 225, 0.25)',
map: null,
createMap: function () {
if (this.map == null) {
this.map = document.createElement("div");
}
},
adornMap: function () {
this.map.style.position = "relative";
this.map.style.width = this.width + "px";
this.map.style.height = this.height + "px";
this.map.style.backgroundColor = this.backgroundColor;
},
initialize: function () {
this.createMap();
this.adornMap();
document.body.appendChild(this.map);
}
};
//蛇对象
var Snake;
Snake = {
snakeWidth: 30,
snakeHeight: 30,
snake: [[3, 1, null, 'red'], [2, 1, null, 'black'], [1, 1, null, 'black']],
maP: null,
direct: "right",
timer: null,
createSnake: function () {
for (var i = 0; i < this.snake.length; i++) {
if (this.snake[i][2] == null) {
this.snake[i][2] = document.createElement("div");
}
this.snake[i][2].style.width = this.snakeWidth + "px";
this.snake[i][2].style.height = this.snakeHeight + "px";
this.snake[i][2].style.backgroundColor = this.snake[i][3];
this.snake[i][2].style.position = "absolute";
this.snake[i][2].style.left = this.snake[i][0] * this.snakeWidth + "px";
this.snake[i][2].style.top = this.snake[i][1] * this.snakeHeight + "px";
this.maP.appendChild(this.snake[i][2]);
}
},
move: function () {
//蛇身移动
for (var i = this.snake.length - 1; i > 0; i--) {
this.snake[i][0] = this.snake[i - 1][0];
this.snake[i][1] = this.snake[i - 1][1];
}
//蛇头移动
switch (this.direct) {
case "left":
this.snake[0][0] -= 1;
break;
case "right":
this.snake[0][0] += 1;
break;
case "up":
this.snake[0][1] -= 1;
break;
case "down":
this.snake[0][1] += 1;
break;
}
//防止蛇移动至地图外
if (this.snake[0][0] > 32) {
this.snake[0][0] = 0;
}
if (this.snake[0][0] < 0) {
this.snake[0][0] = 32;
}
if (this.snake[0][1] < 0) {
this.snake[0][1] = 19;
}
if (this.snake[0][1] > 19) {
this.snake[0][1] = 0;
}
//若蛇撞到自己，则游戏结束
for (var i = 1; i < this.snake.length; i++) {
if (this.snake[0][0] == this.snake[i][0] && this.snake[0][1] == this.snake[i][1]) {
clearInterval(this.timer);
alert("游戏结束！");
return;
}
}
//蛇吃到食物时，重新生成食物位置，蛇身变长一节
if (this.snake[0][0] == Food.left && this.snake[0][1] == Food.top) {
Food.createFood();
this.snake.push(
[
this.snake[this.snake.length - 1][0],
this.snake[this.snake.length - 1][1],
null,
"black"
]
)
}
this.createSnake();
},
initialize: function () {
var that = this;
that.createSnake();
that.timer = setInterval(function () {
that.move();
}, 500)
}
};
//食物对象
var Food;
Food = {
foodWidth: 30,
foodHeight: 30,
backgroundColor: "orange",
left: null,
top: null,
maP: null,
snakE: null,
food: null,
//创建食物
createFood: function () {
this.randomPosition();
if (this.food == null) {
this.food = document.createElement('div');
this.food.style.width = this.foodWidth + "px";
this.food.style.height = this.foodHeight + "px";
this.food.style.backgroundColor = this.backgroundColor;
this.food.style.position = "absolute";
this.maP.appendChild(this.food);
}
this.food.style.left = this.left * this.foodWidth + "px";
this.food.style.top = this.top * this.foodHeight + "px";
},
//随机生成食物位置
randomPosition: function () {
var repeat;
do {
repeat = false;
this.left = Math.floor(Math.random() * 33);
this.top = Math.floor(Math.random() * 20);
for (var i = 0; i < this.snakE.length; i++) {
if (this.left == this.snakE[i][0] && this.top == this.snakE[i][1]) {
repeat = true;
}
}
} while (repeat)
}
};
window.addEventListener('load', function () {
Map.initialize();
Snake.maP = Map.map;
Snake.initialize();
Food.maP = Map.map;
Food.snakE = Snake.snake;
Food.createFood();
//按上下左右键，蛇改变移动方向
window.addEventListener('keyup', function (e) {
var direct = e.keyCode;
switch (direct) {
case 37:
if (Snake.direct == "right") {
return;
}
Snake.direct = "left";
break;
case 38:
if (Snake.direct == "down") {
return;
}
Snake.direct = "up";
break;
case 39:
if (Snake.direct == "left") {
return;
}
Snake.direct = "right";
break;
case 40:
if (Snake.direct == "up") {
return;
}
Snake.direct = "down";
break;
}
})
//长按方向键加速移动
var lastKey = -1;
window.addEventListener('keydown', function (e) {
if (e.keyCode == lastKey) {
switch (e.keyCode) {
case 37:
if (Snake.direct == "right") {
return;
}
Snake.direct = "left";
break;
case 38:
if (Snake.direct == "down") {
return;
}
Snake.direct = "up";
break;
case 39:
if (Snake.direct == "left") {
return;
}
Snake.direct = "right";
break;
case 40:
if (Snake.direct == "up") {
return;
}
Snake.direct = "down";
break;
}
Snake.move();
}
lastKey = e.keyCode;
})
})
</script>
</body>
</html>效果图：
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