用js编写简单的贪吃蛇小游戏
时间：2022-07-23 10:00:36|栏目：JavaScript代码|点击： 次
本文实例为大家分享了js编写简单的贪吃蛇小游戏的具体代码，供大家参考，具体内容如下
代码如下：
HTML 5 部分
<!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>贪恰蛇</title>
<style>
#scence{
width: 800px;
height: 600px;
border: 1px solid #000;
margin: 50px auto;
background-color: aliceblue;
position: relative;
overflow: hidden;
}
.head{
position: absolute;
width: 20px;
height: 20px;
background-color: #000;
}
.tail{
position: absolute;
width: 20px;
height: 20px;
background-color: grey;
}
</style>
</head>
<body>
<div id="scence">
</div>
</body>
</html>
<script src="tools.js"></script>
<script src="../贪吃蛇/snake.js"></script>
<script src="food.js"></script>
<script src="game.js"></script>
js部分
tools.js
function getStyle(ele, styleObj) {
for (const key in styleObj) {
ele.style[key] = styleObj[key];
}
}
function getRandom(a, b) {
return Math.floor(Math.random() * (b - a) + a +1)
}
snake.js
function Snake() {
this.scence = document.querySelector('#scence');
this.body = [
[0, 0, 'grey', null],
[0, 1, 'grey', null],
[0, 2, '#000', null]
];
this.dir = 'right';
this.lastdir = 'right';
this.width = 20;
this.height = 20;
this.scence_w = scence.offsetWidth;
this.scence_h = scence.offsetHeight;
}
Snake.prototype.found = function () {
for (let i = 0; i < this.body.length; i++) {
if (this.body[i][3] == null) {
this.body[i][3] = document.createElement('div');
}
getStyle(this.body[i][3], {
width: this.width + 'px',
height: this.height + 'px',
position: 'absolute',
top: this.height * (this.body[i][0]) + 'px',
left: this.width * (this.body[i][1]) + 'px',
backgroundColor: this.body[i][2]
});
this.scence.appendChild(this.body[i][3]);
}
}
//运动函数
Snake.prototype.move = function () {
var length = this.body.length;
for (let i = 0; i < length - 1; i++) {
this.body[i][0] = this.body[i + 1][0];
this.body[i][1] = this.body[i + 1][1];
}
let snakehead = this.body[length - 1]
switch (this.dir) {
case 'right':
snakehead[1] += 1;
break;
case 'left':
snakehead[1] -= 1
break;
case 'up':
snakehead[0] -= 1
break;
case 'down':
snakehead[0] += 1
break;
}
this.lastdir = this.dir;
snake.found();
}
//计时运动
Snake.prototype.shift = function () {
document.onkeydown = (e) => {
e = e || window.event;
let key = e.keyCode;
switch (key) {
case 39:
if (this.lastdir == 'left') {
this.dir = 'left'
} else {
this.dir = 'right'
};
break;
case 37:
if (this.lastdir == 'right') {
this.dir = 'right'
} else {
this.dir = 'left'
};
break;
case 38:
if (this.lastdir == 'down') {
this.dir = 'down'
} else {
this.dir = 'up'
};
break;
case 40:
if (this.lastdir == 'up') {
this.dir = 'up'
} else {
this.dir = 'down'
};
break;
}
}
}
//游戏结束
Snake.prototype.over = function () {
let top = this.body[this.body.length - 1][0];
let left = this.body[this.body.length - 1][1];
let width = this.scence_w / this.width - 1;
let height = this.scence_w / this.height - 1;
if (top < 0 || left < 0 || top > width || left > height) {
clearInterval(timeid)
alert('game over');
}
for (let i = 0; i < this.body.length - 1; i++) {
if (top == this.body[i][0] && left == this.body[i][1]) {
clearInterval(timeid)
alert('game over');
}
}
}
let snake = new Snake();
snake.found();
snake.shift();
timeid = setInterval(function () {
snake.move();
food.eat();
snake.over()
}, 100)
food.js
function Food() {
this.scence = document.querySelector('#scence');
this.width = 20;
this.height = 20;
this.body = [-1, -1, 'red', null];
this.scence_w = scence.offsetWidth;
this.scence_h = scence.offsetHeight;
}
//食物生成
Food.prototype.crteate = function () {
this.body[1] = getRandom(0, this.scence_w / this.width-1);
this.body[0] = getRandom(0, this.scence_h / this.height-1);
this.body[3] = document.createElement('div');
getStyle(this.body[3], {
width: this.width + 'px',
height: this.height + 'px',
position: 'absolute',
top: this.height * (this.body[0] ) + 'px',
left: this.width * (this.body[1] ) + 'px',
backgroundColor: this.body[2],
borderRadius: ' 50%',
});
this.scence.appendChild(this.body[3]);
}
//蛇吃到食物
Food.prototype.eat=function(){
// const new=[0, 0, 'grey', null]
if(snake.body[snake.body.length-1][0]==this.body[0] && snake.body[snake.body.length-1][1]==this.body[1]){
this.scence.removeChild(this.body[3]);
this.crteate();
snake.body.unshift([-1,-1,"grey",null])
}
}
let food = new Food();
food.crteate();
food.eat();
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