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js代码如何基于javascript实现贪吃蛇游戏
发布时间: 2021年1月13日 | 浏览:
| 分类:js开发
这篇文章主要介绍了如何基于javascript实现贪吃蛇游戏,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下html代码：
css代码：
* {
margin: 0;
padding: 0;
}
body {
background-color: #565F65;
width: 100%;
height: 10vh;
overflow: hidden;
}
.content {
width: 500px;
height: 500px;
position: absolute;
top: 50%;
left: 50%;
margin-top: -250px;
margin-left: -250px;
background-color: #565F65;
border: 10px solid #E7E7E7;
box-shadow: inset 0px 0px 5px 2px #000;
}
.btn {
width: 100%;
height: 100%;
position: absolute;
top: 0;
left: 0;
background-color: rgba(0, 0, 0, .3);
/*游戏未开始时和暂停时的遮罩*/
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: 170px;
height: 80px;
background-image: url(img/startbtn.png);
margin-top: -40px;
margin-left: -85px;
}
.stopBtn {
display: none;
}
.stopBtn button{
width: 70px;
height: 70px;
background-image: url(img/stopbtn.png);
margin-top: -35px;
margin-left: -35px;
}
#snakeWrap {
width: 500px;
height: 500px;
position: relative;
}
.snakeHead { /*蛇头样式*/
background-color: aqua;
border-radius: 50%;
}
.snakeBody { /*蛇身样式*/
background-color: navajowhite;
border-radius: 50%;
}
.food {
/*食物样式*/
background-image: url(img/food.png);
background-size: cover;
}
* {
margin: 0;
padding: 0;
}
body {
background-color: #565F65;
width: 100%;
height: 10vh;
overflow: hidden;
}
.content {
width: 500px;
height: 500px;
position: absolute;
top: 50%;
left: 50%;
margin-top: -250px;
margin-left: -250px;
background-color: #565F65;
border: 10px solid #E7E7E7;
box-shadow: inset 0px 0px 5px 2px #000;
}
.btn {
width: 100%;
height: 100%;
position: absolute;
top: 0;
left: 0;
background-color: rgba(0, 0, 0, .3);
/*游戏未开始时和暂停时的遮罩*/
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: 170px;
height: 80px;
background-image: url(img/startbtn.png);
margin-top: -40px;
margin-left: -85px;
}
.stopBtn {
display: none;
}
.stopBtn button{
width: 70px;
height: 70px;
background-image: url(img/stopbtn.png);
margin-top: -35px;
margin-left: -35px;
}
#snakeWrap {
width: 500px;
height: 500px;
position: relative;
}
.snakeHead { /*蛇头样式*/
background-color: aqua;
border-radius: 50%;
}
.snakeBody { /*蛇身样式*/
background-color: navajowhite;
border-radius: 50%;
}
.food {
/*食物样式*/
background-image: url(img/food.png);
background-size: cover;
}javascript 代码：
var sw = 20,
//一个方块的宽
sh = 20,
//一个方块的高
tr = 25,
//行数
td = 25;
//列数
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 = x * sw;
//方块实际的位置
this.y = y * sh;
//方块实际的位置
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
}
Square.prototype.create = function() {
//创建方块 DOM,并添加到页面里
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;
//存一下蛇头的信息
this.tail = null;
//存一下蛇尾的信息
this.pos = [];
//存储蛇身上的每一个方块的位置,二维数组
this.directionNum = {
//存储蛇走的方向,用一个对象来表示
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
}
}
}
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
var snakeBody1 = new Square(1, 0, 'snakeBody');
snakeBody1.create();
this.pos.push([1, 0]);
//把蛇身1的位置存起来
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的位置存起来
//让蛇头蛇身形成链表关系
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,用来表示蛇走的方向
this.direction = this.directionNum.right; //默认让蛇往右走
}
//这个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
];
//下一个点是自己,代表撞到了自己,游戏结束
var selfCollind = false;
//是否撞到自己
this.pos.forEach(function(value) {
if(value[0] == nextPos[0] && value[1] == nextPos[1]) {
//如果数组中的两个数据都相等,就说明下一个点在蛇身上里面能找到,代表撞到自己了
selfCollind = true;
}
});
if(selfCollind) {
console.log('撞到自己了!');
this.strategies.die.call(this);
return;
}
//下一个点是墙,游戏结束
if(nextPos[0] < 0 || nextPos[1] < 0 || nextPos[0] > td - 1 || nextPos[1] > tr - 1) {
console.log('撞墙了!');
this.strategies.die.call(this);
return;
}
//下一个点是食物,吃
if(food && food.pos[0] == nextPos[0] && food.pos[1] == nextPos[1]) {
//如果这个条件成立说明现在蛇头要走的下一个点是食物的那个点
console.log('撞到食物了了!');
this.strategies.eat.call(this);
return;
}
//下一个点什么都不是,走
this.strategies.move.call(this);
};
//处理碰撞后要做的事
Snake.prototype.strategies = {
move : function(format) {
//这个参数用于决定要不要删除最后一个方块(蛇尾), 当传了这个参数后就表示要做的事情是吃
//创建新身体(在蛇头位置)
var newBody = new Square(this.head.x/sw, this.head.y/sh, 'snakeBody');
//更新链表关系
newBody.next = this.head.next;
newBody.next.last = newBody;
newBody.last = null;
this.head.remove();
//旧舌头从原来的位置删除
newBody.create();
//创建一个新蛇头(蛇头下一个要走到的点)
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) {
//如何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() {
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表示食物的坐标在蛇身上(需要继续循环),false表示食物坐标不在蛇身上(不循环了)
while(include) {
x = Math.round(Math.random() * (td - 1)); //0-29
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,在蛇身上并没有找到
include = false;
}
});
}
//生成食物
food = new Square(x, y, 'food');
food.pos = [x,y]; //存储一下生成食物的坐标,用于跟蛇头要走的下一个点作对比
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;
this.speed = 200;
}
Game.prototype.init = function() {
snake.init();
snake.getNextPos();
createFood();
document.onkeydown = function(ev) {
//用户按下方向键触发事件
if(ev.which == 37 && snake.direction != snake.directionNum.right) {
//用户按下左键是,蛇不能是往右走
snake.direction = snake.directionNum.left;
}else if(ev.which == 38 && snake.direction != snake.directionNum.dowm) {
snake.direction = snake.directionNum.up;
}else if(ev.which == 39 && snake.direction != snake.directionNum.left) {
snake.direction = snake.directionNum.right;
}else if(ev.which == 40 && snake.direction != snake.directionNum.up) {
snake.direction = snake.directionNum.down;
}
}
this.start();
}
Game.prototype.start = function() { //开始游戏
this.timer = setInterval(function() {
snake.getNextPos();
}, this.speed);
}
Game.prototype.pause = function() {
clearInterval(this.timer);
}
Game.prototype.over = function() { //开始游戏
clearInterval(this.timer);
alert('你的得分为' + this.score);
//游戏回到最初的状态
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');
startBtn.onclick = function() {
startBtn.parentNode.style.display = 'none';
game.init();
};
//暂停
var snakeWrap = document.getElementById('snakeWrap');
var puseBtn = document.querySelector('.stopBtn button')
snakeWrap.onclick = function() {
game.pause();
puseBtn.parentNode.style.display = 'block';
}
puseBtn.onclick =function() {
game.start();
puseBtn.parentNode.style.display = 'none';
}
var sw = 20,
//一个方块的宽
sh = 20,
//一个方块的高
tr = 25,
//行数
td = 25;
//列数
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 = x * sw;
//方块实际的位置
this.y = y * sh;
//方块实际的位置
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
}
Square.prototype.create = function() {
//创建方块 DOM,并添加到页面里
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;
//存一下蛇头的信息
this.tail = null;
//存一下蛇尾的信息
this.pos = [];
//存储蛇身上的每一个方块的位置,二维数组
this.directionNum = {
//存储蛇走的方向,用一个对象来表示
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
}
}
}
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
var snakeBody1 = new Square(1, 0, 'snakeBody');
snakeBody1.create();
this.pos.push([1, 0]);
//把蛇身1的位置存起来
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的位置存起来
//让蛇头蛇身形成链表关系
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,用来表示蛇走的方向
this.direction = this.directionNum.right; //默认让蛇往右走
}
//这个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
];
//下一个点是自己,代表撞到了自己,游戏结束
var selfCollind = false;
//是否撞到自己
this.pos.forEach(function(value) {
if(value[0] == nextPos[0] && value[1] == nextPos[1]) {
//如果数组中的两个数据都相等,就说明下一个点在蛇身上里面能找到,代表撞到自己了
selfCollind = true;
}
});
if(selfCollind) {
console.log('撞到自己了!');
this.strategies.die.call(this);
return;
}
//下一个点是墙,游戏结束
if(nextPos[0] < 0 || nextPos[1] < 0 || nextPos[0] > td - 1 || nextPos[1] > tr - 1) {
console.log('撞墙了!');
this.strategies.die.call(this);
return;
}
//下一个点是食物,吃
if(food && food.pos[0] == nextPos[0] && food.pos[1] == nextPos[1]) {
//如果这个条件成立说明现在蛇头要走的下一个点是食物的那个点
console.log('撞到食物了了!');
this.strategies.eat.call(this);
return;
}
//下一个点什么都不是,走
this.strategies.move.call(this);
};
//处理碰撞后要做的事
Snake.prototype.strategies = {
move : function(format) {
//这个参数用于决定要不要删除最后一个方块(蛇尾), 当传了这个参数后就表示要做的事情是吃
//创建新身体(在蛇头位置)
var newBody = new Square(this.head.x/sw, this.head.y/sh, 'snakeBody');
//更新链表关系
newBody.next = this.head.next;
newBody.next.last = newBody;
newBody.last = null;
this.head.remove();
//旧舌头从原来的位置删除
newBody.create();
//创建一个新蛇头(蛇头下一个要走到的点)
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) {
//如何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() {
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表示食物的坐标在蛇身上(需要继续循环),false表示食物坐标不在蛇身上(不循环了)
while(include) {
x = Math.round(Math.random() * (td - 1)); //0-29
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,在蛇身上并没有找到
include = false;
}
});
}
//生成食物
food = new Square(x, y, 'food');
food.pos = [x,y]; //存储一下生成食物的坐标,用于跟蛇头要走的下一个点作对比
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;
this.speed = 200;
}
Game.prototype.init = function() {
snake.init();
snake.getNextPos();
createFood();
document.onkeydown = function(ev) {
//用户按下方向键触发事件
if(ev.which == 37 && snake.direction != snake.directionNum.right) {
//用户按下左键是,蛇不能是往右走
snake.direction = snake.directionNum.left;
}else if(ev.which == 38 && snake.direction != snake.directionNum.dowm) {
snake.direction = snake.directionNum.up;
}else if(ev.which == 39 && snake.direction != snake.directionNum.left) {
snake.direction = snake.directionNum.right;
}else if(ev.which == 40 && snake.direction != snake.directionNum.up) {
snake.direction = snake.directionNum.down;
}
}
this.start();
}
Game.prototype.start = function() { //开始游戏
this.timer = setInterval(function() {
snake.getNextPos();
}, this.speed);
}
Game.prototype.pause = function() {
clearInterval(this.timer);
}
Game.prototype.over = function() { //开始游戏
clearInterval(this.timer);
alert('你的得分为' + this.score);
//游戏回到最初的状态
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');
startBtn.onclick = function() {
startBtn.parentNode.style.display = 'none';
game.init();
};
//暂停
var snakeWrap = document.getElementById('snakeWrap');
var puseBtn = document.querySelector('.stopBtn button')
snakeWrap.onclick = function() {
game.pause();
puseBtn.parentNode.style.display = 'block';
}
puseBtn.onclick =function() {
game.start();
puseBtn.parentNode.style.display = 'none';
}以上就是本文的全部内容，希望对大家的学习有所帮助。
* {
margin: 0;
padding: 0;
}
body {
background-color: #565F65;
width: 100%;
height: 10vh;
overflow: hidden;
}
.content {
width: 500px;
height: 500px;
position: absolute;
top: 50%;
left: 50%;
margin-top: -250px;
margin-left: -250px;
background-color: #565F65;
border: 10px solid #E7E7E7;
box-shadow: inset 0px 0px 5px 2px #000;
}
.btn {
width: 100%;
height: 100%;
position: absolute;
top: 0;
left: 0;
background-color: rgba(0, 0, 0, .3);
/*游戏未开始时和暂停时的遮罩*/
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: 170px;
height: 80px;
background-image: url(img/startbtn.png);
margin-top: -40px;
margin-left: -85px;
}
.stopBtn {
display: none;
}
.stopBtn button{
width: 70px;
height: 70px;
background-image: url(img/stopbtn.png);
margin-top: -35px;
margin-left: -35px;
}
#snakeWrap {
width: 500px;
height: 500px;
position: relative;
}
.snakeHead { /*蛇头样式*/
background-color: aqua;
border-radius: 50%;
}
.snakeBody { /*蛇身样式*/
background-color: navajowhite;
border-radius: 50%;
}
.food {
/*食物样式*/
background-image: url(img/food.png);
background-size: cover;
}
* {
margin: 0;
padding: 0;
}
body {
background-color: #565F65;
width: 100%;
height: 10vh;
overflow: hidden;
}
.content {
width: 500px;
height: 500px;
position: absolute;
top: 50%;
left: 50%;
margin-top: -250px;
margin-left: -250px;
background-color: #565F65;
border: 10px solid #E7E7E7;
box-shadow: inset 0px 0px 5px 2px #000;
}
.btn {
width: 100%;
height: 100%;
position: absolute;
top: 0;
left: 0;
background-color: rgba(0, 0, 0, .3);
/*游戏未开始时和暂停时的遮罩*/
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: 170px;
height: 80px;
background-image: url(img/startbtn.png);
margin-top: -40px;
margin-left: -85px;
}
.stopBtn {
display: none;
}
.stopBtn button{
width: 70px;
height: 70px;
background-image: url(img/stopbtn.png);
margin-top: -35px;
margin-left: -35px;
}
#snakeWrap {
width: 500px;
height: 500px;
position: relative;
}
.snakeHead { /*蛇头样式*/
background-color: aqua;
border-radius: 50%;
}
.snakeBody { /*蛇身样式*/
background-color: navajowhite;
border-radius: 50%;
}
.food {
/*食物样式*/
background-image: url(img/food.png);
background-size: cover;
}javascript 代码：
var sw = 20,
//一个方块的宽
sh = 20,
//一个方块的高
tr = 25,
//行数
td = 25;
//列数
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 = x * sw;
//方块实际的位置
this.y = y * sh;
//方块实际的位置
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
}
Square.prototype.create = function() {
//创建方块 DOM,并添加到页面里
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;
//存一下蛇头的信息
this.tail = null;
//存一下蛇尾的信息
this.pos = [];
//存储蛇身上的每一个方块的位置,二维数组
this.directionNum = {
//存储蛇走的方向,用一个对象来表示
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
}
}
}
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
var snakeBody1 = new Square(1, 0, 'snakeBody');
snakeBody1.create();
this.pos.push([1, 0]);
//把蛇身1的位置存起来
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的位置存起来
//让蛇头蛇身形成链表关系
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,用来表示蛇走的方向
this.direction = this.directionNum.right; //默认让蛇往右走
}
//这个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
];
//下一个点是自己,代表撞到了自己,游戏结束
var selfCollind = false;
//是否撞到自己
this.pos.forEach(function(value) {
if(value[0] == nextPos[0] && value[1] == nextPos[1]) {
//如果数组中的两个数据都相等,就说明下一个点在蛇身上里面能找到,代表撞到自己了
selfCollind = true;
}
});
if(selfCollind) {
console.log('撞到自己了!');
this.strategies.die.call(this);
return;
}
//下一个点是墙,游戏结束
if(nextPos[0] < 0 || nextPos[1] < 0 || nextPos[0] > td - 1 || nextPos[1] > tr - 1) {
console.log('撞墙了!');
this.strategies.die.call(this);
return;
}
//下一个点是食物,吃
if(food && food.pos[0] == nextPos[0] && food.pos[1] == nextPos[1]) {
//如果这个条件成立说明现在蛇头要走的下一个点是食物的那个点
console.log('撞到食物了了!');
this.strategies.eat.call(this);
return;
}
//下一个点什么都不是,走
this.strategies.move.call(this);
};
//处理碰撞后要做的事
Snake.prototype.strategies = {
move : function(format) {
//这个参数用于决定要不要删除最后一个方块(蛇尾), 当传了这个参数后就表示要做的事情是吃
//创建新身体(在蛇头位置)
var newBody = new Square(this.head.x/sw, this.head.y/sh, 'snakeBody');
//更新链表关系
newBody.next = this.head.next;
newBody.next.last = newBody;
newBody.last = null;
this.head.remove();
//旧舌头从原来的位置删除
newBody.create();
//创建一个新蛇头(蛇头下一个要走到的点)
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) {
//如何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() {
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表示食物的坐标在蛇身上(需要继续循环),false表示食物坐标不在蛇身上(不循环了)
while(include) {
x = Math.round(Math.random() * (td - 1)); //0-29
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,在蛇身上并没有找到
include = false;
}
});
}
//生成食物
food = new Square(x, y, 'food');
food.pos = [x,y]; //存储一下生成食物的坐标,用于跟蛇头要走的下一个点作对比
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;
this.speed = 200;
}
Game.prototype.init = function() {
snake.init();
snake.getNextPos();
createFood();
document.onkeydown = function(ev) {
//用户按下方向键触发事件
if(ev.which == 37 && snake.direction != snake.directionNum.right) {
//用户按下左键是,蛇不能是往右走
snake.direction = snake.directionNum.left;
}else if(ev.which == 38 && snake.direction != snake.directionNum.dowm) {
snake.direction = snake.directionNum.up;
}else if(ev.which == 39 && snake.direction != snake.directionNum.left) {
snake.direction = snake.directionNum.right;
}else if(ev.which == 40 && snake.direction != snake.directionNum.up) {
snake.direction = snake.directionNum.down;
}
}
this.start();
}
Game.prototype.start = function() { //开始游戏
this.timer = setInterval(function() {
snake.getNextPos();
}, this.speed);
}
Game.prototype.pause = function() {
clearInterval(this.timer);
}
Game.prototype.over = function() { //开始游戏
clearInterval(this.timer);
alert('你的得分为' + this.score);
//游戏回到最初的状态
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');
startBtn.onclick = function() {
startBtn.parentNode.style.display = 'none';
game.init();
};
//暂停
var snakeWrap = document.getElementById('snakeWrap');
var puseBtn = document.querySelector('.stopBtn button')
snakeWrap.onclick = function() {
game.pause();
puseBtn.parentNode.style.display = 'block';
}
puseBtn.onclick =function() {
game.start();
puseBtn.parentNode.style.display = 'none';
}
var sw = 20,
//一个方块的宽
sh = 20,
//一个方块的高
tr = 25,
//行数
td = 25;
//列数
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 = x * sw;
//方块实际的位置
this.y = y * sh;
//方块实际的位置
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
}
Square.prototype.create = function() {
//创建方块 DOM,并添加到页面里
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;
//存一下蛇头的信息
this.tail = null;
//存一下蛇尾的信息
this.pos = [];
//存储蛇身上的每一个方块的位置,二维数组
this.directionNum = {
//存储蛇走的方向,用一个对象来表示
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
}
}
}
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
var snakeBody1 = new Square(1, 0, 'snakeBody');
snakeBody1.create();
this.pos.push([1, 0]);
//把蛇身1的位置存起来
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的位置存起来
//让蛇头蛇身形成链表关系
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,用来表示蛇走的方向
this.direction = this.directionNum.right; //默认让蛇往右走
}
//这个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
];
//下一个点是自己,代表撞到了自己,游戏结束
var selfCollind = false;
//是否撞到自己
this.pos.forEach(function(value) {
if(value[0] == nextPos[0] && value[1] == nextPos[1]) {
//如果数组中的两个数据都相等,就说明下一个点在蛇身上里面能找到,代表撞到自己了
selfCollind = true;
}
});
if(selfCollind) {
console.log('撞到自己了!');
this.strategies.die.call(this);
return;
}
//下一个点是墙,游戏结束
if(nextPos[0] < 0 || nextPos[1] < 0 || nextPos[0] > td - 1 || nextPos[1] > tr - 1) {
console.log('撞墙了!');
this.strategies.die.call(this);
return;
}
//下一个点是食物,吃
if(food && food.pos[0] == nextPos[0] && food.pos[1] == nextPos[1]) {
//如果这个条件成立说明现在蛇头要走的下一个点是食物的那个点
console.log('撞到食物了了!');
this.strategies.eat.call(this);
return;
}
//下一个点什么都不是,走
this.strategies.move.call(this);
};
//处理碰撞后要做的事
Snake.prototype.strategies = {
move : function(format) {
//这个参数用于决定要不要删除最后一个方块(蛇尾), 当传了这个参数后就表示要做的事情是吃
//创建新身体(在蛇头位置)
var newBody = new Square(this.head.x/sw, this.head.y/sh, 'snakeBody');
//更新链表关系
newBody.next = this.head.next;
newBody.next.last = newBody;
newBody.last = null;
this.head.remove();
//旧舌头从原来的位置删除
newBody.create();
//创建一个新蛇头(蛇头下一个要走到的点)
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) {
//如何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() {
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表示食物的坐标在蛇身上(需要继续循环),false表示食物坐标不在蛇身上(不循环了)
while(include) {
x = Math.round(Math.random() * (td - 1)); //0-29
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,在蛇身上并没有找到
include = false;
}
});
}
//生成食物
food = new Square(x, y, 'food');
food.pos = [x,y]; //存储一下生成食物的坐标,用于跟蛇头要走的下一个点作对比
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;
this.speed = 200;
}
Game.prototype.init = function() {
snake.init();
snake.getNextPos();
createFood();
document.onkeydown = function(ev) {
//用户按下方向键触发事件
if(ev.which == 37 && snake.direction != snake.directionNum.right) {
//用户按下左键是,蛇不能是往右走
snake.direction = snake.directionNum.left;
}else if(ev.which == 38 && snake.direction != snake.directionNum.dowm) {
snake.direction = snake.directionNum.up;
}else if(ev.which == 39 && snake.direction != snake.directionNum.left) {
snake.direction = snake.directionNum.right;
}else if(ev.which == 40 && snake.direction != snake.directionNum.up) {
snake.direction = snake.directionNum.down;
}
}
this.start();
}
Game.prototype.start = function() { //开始游戏
this.timer = setInterval(function() {
snake.getNextPos();
}, this.speed);
}
Game.prototype.pause = function() {
clearInterval(this.timer);
}
Game.prototype.over = function() { //开始游戏
clearInterval(this.timer);
alert('你的得分为' + this.score);
//游戏回到最初的状态
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');
startBtn.onclick = function() {
startBtn.parentNode.style.display = 'none';
game.init();
};
//暂停
var snakeWrap = document.getElementById('snakeWrap');
var puseBtn = document.querySelector('.stopBtn button')
snakeWrap.onclick = function() {
game.pause();
puseBtn.parentNode.style.display = 'block';
}
puseBtn.onclick =function() {
game.start();
puseBtn.parentNode.style.display = 'none';
}以上就是本文的全部内容，希望对大家的学习有所帮助。
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