本文小编为大家详细介绍“怎么用JS实现贪吃蛇游戏”，内容详细，步骤清晰，细节处理妥当，希望这篇“怎么用JS实现贪吃蛇游戏”文章能帮助大家解决疑惑，下面跟着小编的思路慢慢深入，一起来学习新知识吧。
效果图：
完整代码如下：
html：
<!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> <link rel="stylesheet" href="index.css" > <script src="index.js"></script> </head> <body> <div class="content"> <div class="btn startBtn"><button></button></div> <div class="btn pauseBtn"><button></button></div> <div id="snakeWrap"> <!-- <div class="snakeHead"></div> <div class="snakeBody"></div> <div class="food"></div> --> </div> </div> </body> </html>
css：
.content {
position: relative;
width: 640px;
height: 640px;
margin: 100px auto;
}
.btn {
width: 100%;
height: 100%;
position: absolute;
top: 0;
left: 0;
background-color: black;
opacity: .1;
z-index: 2;
}
.btn button {
background: none;
border: none;
background-size: 100% 100%;
cursor: pointer;
outline: none;
position: absolute;
left: 50%;
top: 50%;
}
.startBtn button {
width: 200px;
height: 80px;
background-image: url(../贪吃蛇/img/btn.gif);
margin-left: -100px;
margin-top: -40px;
}
.pauseBtn {
display: none;
}
.pauseBtn button {
width: 70px;
height: 70px;
background-image: url(../贪吃蛇/img/btn4.png);
margin-left: -35px;
margin-top: -35px;
}
#snakeWrap {
width: 600px;
height: 600px;
background-color: pink;
border: 20px solid purple;
position: relative;
}
/* #snakeWrap div {
width: 20px;
height: 20px;
} */
.snakeHead {
background-image: url(../贪吃蛇/img/snake.png);
background-size: cover;
}
.snakeBody {
background-color: rgb(85, 146, 126);
border-radius: 50%;
}
.food {
background-image: url(../贪吃蛇/img/草莓.png);
background-size: cover;
}js：
window.addEventListener('load', function() {
// 声明方块的宽高，行数和列数
var sw = 20,
sh = 20,
tr = 30,
td = 30;
var snake = null, //蛇的实例
food = null, //食物的实例
game = null; //游戏的实例
function Square(x, y, classname) {
this.x = sw * x;
this.y = sh * y;
this.class = classname;
this.viewContent = document.createElement('div'); //方块对应的DOM元素
this.viewContent.className = this.class;
this.parent = document.getElementById('snakeWrap'); //方块的父级
}
//创建方块DOM，并添加到页面里
Square.prototype.create = function() {
this.viewContent.style.position = 'absolute';
this.viewContent.style.width = sw + 'px';
this.viewContent.style.height = sh + 'px';
this.viewContent.style.left = this.x + 'px';
this.viewContent.style.top = this.y + 'px';
this.parent.appendChild(this.viewContent);
};
Square.prototype.remove = function() {
this.parent.removeChild(this.viewContent);
};
//蛇
function Snake() {
this.head = null //存蛇头的信息
this.tail = null //存蛇尾的信息
this.pos = []; //存蛇身上每个方块的位置
//存储蛇走的方向，用一个对象来表示
this.directionNum = {
left: {
x: -1,
y: 0,
rotate: 180
},
right: {
x: 1,
y: 0,
rotate: 0
},
up: {
x: 0,
y: -1,
rotate: -90
},
down: {
x: 0,
y: 1,
rotate: 90
}
};
}
//初始化
Snake.prototype.init = function() {
//创建蛇头
var snakeHead = new Square(2, 0, 'snakeHead');
snakeHead.create();
this.head = snakeHead; //存储蛇头信息
this.pos.push([2, 0]); //把蛇头的位置存起来
//创建蛇身体1
var snakeBody1 = new Square(1, 0, 'snakeBody');
snakeBody1.create();
this.pos.push([1, 0]); //把蛇身1的坐标存起来
//创建蛇身体2
var snakeBody2 = new Square(0, 0, 'snakeBody');
snakeBody2.create();
this.tail = snakeBody2; //把蛇尾的信息存起来
this.pos.push([0, 0]); //把蛇身1的坐标存起来
//形成链表关系
snakeHead.last = null;
snakeHead.next = snakeBody1;
snakeBody1.last = snakeHead;
snakeBody1.next = snakeBody2;
snakeBody2.last = snakeBody1;
snakeBody2.next = null;
//给蛇添加一条属性，用来表示蛇的走向
this.direction = this.directionNum.right; //默认让蛇往右走
};
//该方法用来获取蛇头的下一个位置对应的元素，要根据元素做不同的事情
Snake.prototype.getNextPos = function() {
var nextPos = [ //蛇头要走的下一个点的坐标
this.head.x / sw + this.direction.x,
this.head.y / sh + this.direction.y
];
// console.log(nextPos[0]);
//下个点是自己，游戏结束
var selfCollied = false; //是否撞到自己，默认是否
//value表示数组中的某一项
this.pos.forEach(function(value) {
// console.log(nextPos[0], value[0]);
if (value[0] == nextPos[0] && value[1] == nextPos[1]) {
selfCollied = true;
// console.log(2);
}
});
if (selfCollied) {
console.log('撞到自己了!');
this.strategies.die.call(this);
return;
}
// 下个点是墙，游戏结束
if (nextPos[0] < 0 || nextPos[1] < 0 || nextPos[0] > td - 1 || nextPos[1] > tr - 1) {
console.log('撞墙!');
this.strategies.die.call(this);
return;
}
// 下个点是食物，吃
if (food && food.pos[0] == nextPos[0] && food.pos[1] == nextPos[1]) {
//如这条件成立，说明蛇头走的下一点是食物的点
console.log('撞到食物了');
this.strategies.eat.call(this);
return;
}
// 下个点什么都不是，继续走
this.strategies.move.call(this);
};
// 处理碰撞后要做的事
Snake.prototype.strategies = {
move: function(format) { //format这个参数用于决定要不要删除最后一个方块（蛇尾）,当传了这个参数就表示要做的事情是吃
//创建新身体（在旧蛇头的位置）
var newBody = new Square(this.head.x / sw, this.head.y / sh, 'snakeBody');
//更新链表的关系
newBody.next = this.head.next;
newBody.next.last = newBody;
newBody.last = null;
//把旧蛇头从原来的位置删除
this.head.remove();
newBody.create();
//创建新的蛇头（蛇头下一个要走到的点nextPos）
var newHead = new Square(this.head.x / sw + this.direction.x, this.head.y / sh + this.direction.y, 'snakeHead');
//更新链表关系
newHead.next = newBody;
newHead.last = null;
newBody.last = newHead;
newHead.viewContent.style.transform = 'rotate(' + this.direction.rotate + 'deg)';
newHead.create();
//蛇身上的每一个方块的坐标也要更新
this.pos.splice(0, 0, [this.head.x / sw + this.direction.x, this.head.y / sh + this.direction.y])
this.head = newHead; //还要把this.head的信息更新一下
if (!format) { //如果format的值为false，表示需要删除（除了吃之外的操作）
this.tail.remove();
this.tail = this.tail.last;
this.pos.pop();
}
},
eat: function() {
this.strategies.move.call(this, true);
createFood();
game.score++;
},
die: function() {
// console.log('die');
game.over();
}
}
snake = new Snake();
//创建食物
function createFood() {
//食物小方块的随机坐标
var x = null;
var y = null;
var include = true; //循环跳出的条件，true表示食物坐标在蛇身上。（需要继续循环）false表示食物的坐标不再蛇身上（不用继续循环）
while (include) {
x = Math.round(Math.random() * (td - 1));
y = Math.round(Math.random() * (tr - 1));
snake.pos.forEach(function(value) {
if (x != value[0] && y != value[1]) {
//这个条件成立说明现在随机出来的这个坐标，在蛇身上没有找到。
include = false;
}
});
}
//生成食物
food = new Square(x, y, 'food');
//存储生成食物的坐标，用于跟蛇头要走的下一坐标对比
food.pos = [x, y];
var foodDom = document.querySelector('.food');
if (foodDom) {
foodDom.style.left = x * sw + 'px';
foodDom.style.top = y * sh + 'px';
} else {
food.create();
}
}
//创建游戏逻辑
function Game() {
this.timer = null;
this.score = 0;
}
Game.prototype.init = function() {
snake.init();
// snake.getNextPos();
createFood();
var flag = true;
document.onkeydown = function(ev) {
//当蛇在往右走，不能按左键
if (ev.which == 37 && snake.direction != snake.directionNum.right) {
if (flag) {
flag = false;
setTimeout(function() {
snake.direction = snake.directionNum.left;
flag = true;
}, 150)
}
} else if (ev.which == 38 && snake.direction != snake.directionNum.down) {
if (flag) {
flag = false;
setTimeout(function() {
snake.direction = snake.directionNum.up;
flag = true;
}, 150)
}
} else if (ev.which == 39 && snake.direction != snake.directionNum.left) {
if (flag) {
flag = false;
setTimeout(function() {
snake.direction = snake.directionNum.right;
flag = true;
}, 150)
}
} else if (ev.which == 40 && snake.direction != snake.directionNum.up) {
if (flag) {
flag = false;
setTimeout(function() {
snake.direction = snake.directionNum.down;
flag = true;
}, 150)
}
}
}
this.start();
};
//开始游戏
Game.prototype.start = function() {
this.timer = setInterval(function() {
snake.getNextPos();
}, 150);
};
//暂停游戏
Game.prototype.pause = function() {
clearInterval(this.timer);
};
//游戏结束
Game.prototype.over = function() {
clearInterval(this.timer);
alert('你的得分为' + this.score);
//游戏回到初始状态
var snakeWrap = document.getElementById('snakeWrap');
snakeWrap.innerHTML = '';
snake = new Snake();
game = new Game();
var startBtnWrap = document.querySelector('.startBtn');
startBtnWrap.style.display = 'block';
};
//开启游戏
game = new Game();
var startBtn = document.querySelector('.startBtn button');
console.log(startBtn);
startBtn.onclick = function() {
startBtn.parentNode.style.display = 'none';
game.init();
};
//暂停游戏
var snakeWrap = document.getElementById('snakeWrap');
console.log(snakeWrap);
var pauseBtn = document.querySelector('.pauseBtn button');
console.log(pauseBtn);
snakeWrap.onclick = function() {
game.pause();
pauseBtn.parentNode.style.display = 'block';
console.log(123);
};
pauseBtn.onclick = function() {
game.start();
pauseBtn.parentNode.style.display = 'none';
}
})读到这里，这篇“怎么用JS实现贪吃蛇游戏”文章已经介绍完毕，想要掌握这篇文章的知识点还需要大家自己动手实践使用过才能领会，如果想了解更多相关内容的文章，欢迎关注亿速云行业资讯频道。
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