JS版的贪吃蛇
Html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<link rel="stylesheet" type="text/css" href="./CSS/index.css"/>
</head>
<body>
<div class="content" id="">
<div class="btn pause" id="">
<button type="button"></button>
</div>
<div class="btn start" id="">
<button type="button"></button>
</div>
<div id="score">
分数:<input type="text" name="" id="" value="" />
</div>
<div class="snakeWrap" id="snakeWrap">
</div>
<div class="button" id="">
<button type="button" style="background-color: gray;">简单</button>
<button type="button">难</button>
<button type="button">较难</button>
<button type="button">特别难</button>
</div>
</div>
<script src="./JS/index.js" type="text/javascript" charset="utf-8"></script>
</body>
</html>
CSS
.content{
width: 640px;
height: 640px;
margin: 40px auto;
position: relative;
}
.btn{
width: 100%;
height: 100%;
position: absolute;
left: 0;
top: 0;
z-index: 2;
}
.btn button{
background: none;
border: none;
background-size: 100% 100%;
cursor: pointer;
outline: none;
position: absolute;
left: 50%;
top: 50%;
}
.start button{
width: 200px;
height: 80px;
background-image: url(../images/startGame.png);
margin-top: -40px;
margin-left: -100px;
}
.pause{
display: none;
}
.pause button{
width: 70px;
height: 70px;
background-image: url(../images/pause.png);
margin-top: -35px;
margin-left: -35px;
}
.snakeHead{
background-image:url(../images/snake.png) ;
background-size: cover;//背景大小和图片大小一样
}
.snakeWrap{
width: 600px;
height: 600px;
background-color:gainsboro;
border: 20px solid gray;
position: relative;
}
.snakeBody{
background-color: #9ddbb1;
border-radius: 50%;
}
.food{
background-image: url(../images/food.png);
background-size: cover;//背景大小和图片大小一样
}
#score{
z-index: 3;
position: absolute;
display: none;
margin-top: 30px;
margin-left: 30px;
color: red;
font-size: 15px;
}
#score input{
margin-left: 0;
border: none;
background-color: transparent;
width: 30px;
height: 30px;
color: #FF0000;
text-align: center;
font-size: 15px;
}
JS
var sw = 20, //一个方块的宽
sh = 20, //一个方块的高
tr = 30, //行数
td = 30; //列数
var snake = null, //蛇实例
food = null, //食物实例
game = null; //游戏实例
var v = 200;
//方块构造函数 (链表节点Node)
function Square(x, y, classname) {
this.next = null; //下一个节点
this.pre = null; //上一个节点
// x,y指的是小方块的位置,className是小方块的class
this.x = x * sw;
this.y = y * sh;
this.name = classname; //该元素的class
this.viewContent = document.createElement('div'); //方块对应的dom元素
this.viewContent.className = this.name;
//snakeWrap
this.parent = document.getElementById('snakeWrap');
}
//在dom中创建一个方块
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';
//添加到snakeWrap中
this.parent.appendChild(this.viewContent);
}
//在dom中删除方块
Square.prototype.remove = function() {
this.parent.removeChild(this.viewContent);
}
//蛇(链表)
function Snake() {
this.head = null; //存蛇头信息
this.tail = null; //蛇尾
this.pos = []; //每一个方块位置
this.directionNum = { //存蛇走的方向
left: {
x: -1,
y: 0,
rotate: 90
},
up: {
x: 0,
y: -1,
rotate: 0
},
down: {
x: 0,
y: 1,
rotate: -90
},
right: {
x: 1,
y: 0,
rotate: 180
}
}
this.direction = this.directionNum.right;
}
//初始化蛇
Snake.prototype.init = function() {
//初始化蛇头
var snakeHead = new Square(2, 0, 'snakeHead');
snakeHead.create();
this.head = snakeHead;
this.pos.push([2, 0]);
//初始化蛇身体
var snakebody1 = new Square(1, 0, 'snakeBody');
snakebody1.create();
this.pos.push([1, 0]);
var snakebody2 = new Square(0, 0, 'snakeBody');
this.tail = snakebody2;
snakebody2.create();
this.pos.push([0, 0]);
//链表
snakeHead.next = snakebody1;
snakebody1.pre = snakeHead;
snakebody1.next = snakebody2;
snakebody2.pre = snakebody1;
}
//获取下一个点
Snake.prototype.getNextPos = function() {
var nextPos = [
this.head.x / sw + this.direction.x,
this.head.y / sh + this.direction.y
]
//撞到自己游戏结束(下一个点的坐标在pos中可以找到)
var selfCollied = false;
this.pos.forEach(function(value) {
if (value[0] == nextPos[0] && value[1] == nextPos[1]) {
selfCollied = true;
}
})
if (selfCollied) {
this.strategies.over.call(this);
return;
}
//撞到围墙游戏结束
if (nextPos[0] < 0 || nextPos[1] < 0 || nextPos[0] > tr - 1 || nextPos[1] > td - 1) {
this.strategies.over.call(this);
return;
}
//撞到食物，吃
if (food && food.pos[0] == nextPos[0] && food.pos[1] == nextPos[1]) {
this.strategies.eat.call(this);
return;
}
//什么都不是，走
this.strategies.move.call(this);
}
//处理碰撞后要做的事
Snake.prototype.strategies = {
over: function() {
game.over();
// 要在这个函数里面操作snake就得使用call
},
eat: function() {
//直接调用move
this.strategies.move.call(this, true);
createFood();
game.addScore();
},
move: function(format) {
//创建一个新身体(在旧蛇头的位置)
var newBody = new Square(this.head.x / sw, this.head.y / sh, 'snakeBody');
newBody.create();
//节点插入链表中
newBody.next = this.head.next;
newBody.next.pre = newBody;
//创建一个新蛇头
var newHead = new Square(this.head.x / sw + this.direction.x, this.head.y / sh + this.direction.y,
'snakeHead');
newHead.viewContent.style.transform = 'rotate(' + this.direction.rotate + ')';
newHead.create();
//节点插入链表
newBody.pre = newHead;
newHead.next = newBody;
//将新蛇头加入pos头
this.pos.unshift([this.head.x / sw + this.direction.x, this.head.y / sh + this.direction.y]);
if (!format) { // 如果format为fasle时,需要删除,不是吃时
//移除尾
this.tail.remove();
//将就旧蛇尾从pos(尾)中删掉
this.pos.pop([this.tail.x / sw, this.tail.y / sh]);
//新蛇头替换就蛇头
this.tail = this.tail.pre;
this.tail.next = null;
}
//移除旧头
this.head.next = null
this.head.remove();
this.head = newHead;
}
}
// 创造食物函数
function createFood() {
var x = null;
var y = null;
var include = true;
while (include) {
//随机数 math.round四折五入 math.random()*x 随机产生的数在0--x
x = Math.round(Math.random() * (td - 1));
y = Math.round(Math.random() * (td - 1));
snake.pos.forEach(function(value) {
if (x != value[0] && y != value[1]) {
include = false;
}
});
}
food = new Square(x, y, 'food');
food.pos = [x, y];
console.log(food);
//判断是否还有食物(一直是一个foodDom)
var foodDom = document.getElementsByClassName('food')[0];
if (foodDom) {
foodDom.style.left = x * sw + 'px';
foodDom.style.top = y * sh + 'px';
} else {
food.create();
}
}
//游戏构造函数
function Game() {
this.timer = null;
this.socre = 0;
}
//增加分数
Game.prototype.addScore = function() {
game.socre++;
var score1 = document.querySelector('#score input');
score1.value = this.socre;
}
//游戏初始化
Game.prototype.init = function() {
snake.init();
createFood();
var score2 = document.getElementById('score');
score2.style.display = 'block';
document.querySelector('#score input').value = this.socre;
document.onkeydown = function(e) {
// e.which 37-40 左 上 右 下
if (e.which == 37 && snake.direction != snake.directionNum.right) { // 按下左键并且这个蛇不往右走
snake.direction = snake.directionNum.left;
} else if (e.which == 38 && snake.direction != snake.directionNum.down) { //按下上键
snake.direction = snake.directionNum.up;
} else if (e.which == 39 && snake.direction != snake.directionNum.left) { //按下右键
snake.direction = snake.directionNum.right;
} else if (e.which == 40 && snake.direction != snake.directionNum.up) { //按下下键
snake.direction = snake.directionNum.down;
}
}
var snakeWrop = document.getElementById('snakeWrap');
snakeWrop.onclick = function() {
var pauseBtn = document.querySelector('.pause')
pauseBtn.style.display = 'block';
game.pause();
}
this.start();
}
//开始游戏
Game.prototype.start = function() {
this.timer = setInterval(function() {
snake.getNextPos();
}, v);
}
//暂停游戏
Game.prototype.pause = function() {
clearInterval(this.timer);
//暂停游戏
var pauseBtn = document.querySelector('.pause')
pauseBtn.onclick = function() {
game.start();
pauseBtn.style.display = 'none';
}
}
//结束游戏
Game.prototype.over = function() {
clearInterval(this.timer);
alert('得分' + this.socre);
//清屏
var snakeWrop = document.getElementById('snakeWrap');
snakeWrop.innerHTML = '';
document.getElementById('score').style.display = 'none';
//显示出开始游戏
var startBtn = document.querySelector('.start');
startBtn.style.display = 'block';
// 清分
//game为空
snake = new Snake();
game = new Game;
}
game = new Game();
//重置游戏
function reset(){
clearInterval(game.timer);
var snakeWrop = document.getElementById('snakeWrap');
snakeWrop.innerHTML = '';
document.getElementById('score').style.display = 'none';
//显示出开始游戏
var startBtn = document.querySelector('.start');
startBtn.style.display = 'block';
}
//游戏初始化
function init(){
snake = new Snake();
game = new Game();
startBtn.parentNode.style.display = 'none';
game.init();
}
//开启游戏
var startBtn = document.querySelector('.start button');
startBtn.onclick = function() {
console.log(v);
init();
}
var button = document.getElementsByClassName('button')[0].children;
button[0].onclick = function(){
for(var i=0;i<button.length;i++){
button[i].style = 'none';
}
this.style.backgroundColor ='gray';
v = 200;
reset();
}
button[1].onclick = function(){
document.getElementById('score').style.display = 'none';
for(var i=0;i<button.length;i++){
button[i].style = 'none';
}
this.style.backgroundColor ='gray';
v=150;
reset();
}
button[2].onclick = function(){
for(var i=0;i<button.length;i++){
button[i].style = 'none';
}
this.style.backgroundColor ='gray';
v=75;
reset();
}
button[3].onclick = function(){
for(var i=0;i<button.length;i++){
button[i].style = 'none';
}
this.style.backgroundColor ='gray';
v=30;
reset();
}