用原生js写了个贪吃蛇
立个flag 看看A*寻路 以后再改改
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
// 样式
li{list-style: none;}
div span.grade{width: 80px;height: 40px;font: 20px/40px "";float: left;;background: deepskyblue;border: none;border-radius: 5px;color: #fff;text-align: center;margin-bottom: 10px;}
div .start{width: 80px;height: 40px;font: 20px/40px "";float: left;margin-right: 30px;background: deepskyblue;border: none;border-radius: 5px;color: #fff;outline: none;}
div i{float: left;height: 40px;width:100px;font:26px/40px "";text-align: center;}
div span.level2{width: 80px;height: 40px;font: 20px/40px "";float: left;background: deepskyblue;border: none;border-radius: 5px;color: #fff;text-align: center;margin-bottom: 10px;margin-right: 10px;}
div li:nth-of-type(3) input{width: 30px;height: 40px;font: 20px/40px "";outline: none;background: deepskyblue;border: none;border-radius: 5px;color: #fff;text-align: center;margin: 0 8px;}
div li:nth-of-type(3) i{
width: 30px;height: 30px;font: 20px /30px "";text-align: center;border: 0;float: left;
}
</style>
</head>
<body>
<div>
<ul>
<li><span class="grade">分数</span><i></i></li>
<li><input type="button" value="开始" class="start"></li>
<li><span class="level2">难度</span><input type="button" value="-" class="sub"><i class="level">1</i><input type="button" value="+" class="add"></li>
</ul>
</div>
</body>
<script>
class Game{
constructor(co) {
//背景图默认样式
this.desktop = {
h:400,
w:800,
c:'#999'
};
//食物默认样式
this.food = {
h:20,
w:20,
c:'green'
};
//贪吃蛇初始样式
this.snake = {
w:20,
h:20,
c:'red',
direct:'right'
// speed:300,
}
//蛇身建立数组
this.pos=[{x:5,y:3,c:'red'},{x:4,y:3,c:randomColor()},{x:3,y:3,c:randomColor()}];
this.grade = 0;
if(co){
this.init();
}
}
init(){
this.desktopInit();
this.foodInit();
this.snakeInit();
}
// 背景初始
desktopInit(){
this.desktop.ele = document.createElement('div');
this.desktop.ele.style.cssText = `width:${this.desktop.w}px;height:${this.desktop.h}px;background:${this.desktop.c};margin:10px auto;position: relative;`;
document.body.appendChild(this.desktop.ele);
}
// 食物初始
foodInit(){
this.food.ele = document.createElement('div');
this.food.ele.style.cssText = `width:${this.food.w}px;height:${this.food.h}px;background:${this.food.c};position: absolute;`;
this.desktop.ele.appendChild(this.food.ele);
this.foodVal();
}
// 食物随机定位坐标
foodVal(){
this.food.x = random(0,(this.desktop.w/this.food.w-1));
this.food.y = random(0,(this.desktop.h/this.food.h-1));
this.foodPlace();
}
// 食物定位 以及不生成在蛇身
foodPlace(){
for(var i = 0;i<this.pos.length;i++){
if(this.food.x == this.pos[i].x && this.food.y == this.pos[i].y){
this.foodVal();
return;
}
}
this.food.l = this.food.x*this.food.w;
this.food.t = this.food.y*this.food.h;
this.food.ele.style.left = this.food.l + "px";
this.food.ele.style.top = this.food.t + "px";
}
// 蛇身初始
snakeInit(){
for(var i = 0;i<this.pos.length;i++){
if(!this.pos[i].ele){
this.pos[i].ele = document.createElement('div');
this.pos[i].ele.style.cssText = `width:${this.snake.w}px;height:${this.snake.h}px;background:${this.pos[i].c};position: absolute;`;
this.desktop.ele.appendChild(this.pos[i].ele);
}
this.pos[i].ele.style.left = this.pos[i].x * this.snake.w + "px";
this.pos[i].ele.style.top = this.pos[i].y * this.snake.h + "px";
}
clearTimeout(this.snake.t);
// 移动一次 渲染页面一次
this.snake.t = setTimeout(() => {
this.snakeMove();
},speed);
}
// 蛇身移动
snakeMove(){
for(var i = this.pos.length-1;i>0;i--){
this.pos[i].x = this.pos[i-1].x;
this.pos[i].y = this.pos[i-1].y;
}
this.snakeHead();
this.snakeInit();
this.addEvent();
this.eatFood();
this.deadWay();
}
// 添加键盘事件
addEvent(){
var that = this;
document.onkeydown = function (eve) {
var e = eve || window.event;
var keyCode = e.keyCode || e.which;
that.direction(keyCode);
}
}
// 蛇身运动方向 且不许反方向按键
direction(eve){
if(this.snake.direct== 'left' && eve == 39){
eve = 37;
}else if(this.snake.direct== 'top' && eve == 40){
eve = 38;
}else if(this.snake.direct== 'right' && eve == 37){
eve = 39;
}else if(this.snake.direct== 'bottom' && eve == 38){
eve = 40;
}
switch(eve){
case 37: this.snake.direct = 'left';break;
case 38: this.snake.direct = 'top';break;
case 39: this.snake.direct = 'right';break;
case 40: this.snake.direct = 'bottom';break;
}
}
// 蛇头转向
snakeHead(){
switch(this.snake.direct){
case 'left' :this.pos[0].x -= 1;break;
case 'top' :this.pos[0].y -= 1;break;
case 'right' :this.pos[0].x += 1;break;
case 'bottom' :this.pos[0].y += 1;break;
}
}
// 吃到食物，身体长度++，刷新食物位置
eatFood(){
if(this.pos[0].x == this.food.x && this.pos[0].y == this.food.y){
this.grade ++;
grade.innerHTML = this.grade;
this.pos.push({
x:this.pos[this.pos.length-1].x,
y:this.pos[this.pos.length-1].y,
c:randomColor()
});
this.foodVal();
}
}
// 寻死方式
deadWay(){
this.wall();
this.eatSelf();
}
wall(){
if(this.pos[0].x<0||this.pos[0].x>this.desktop.w/this.snake.w-1||this.pos[0].y<0||this.pos[0].y>this.desktop.h/this.snake.h-1){
clearTimeout(this.snake.t);
alert('撞墙了');
this.gameOver();
}
}
eatSelf(){
for(var i = 1;i<this.pos.length;i++){
if(this.pos[0].x == this.pos[i].x && this.pos[0].y == this.pos[i].y){
clearTimeout(this.time);
alert('撞到自己了');
this.gameOver();
}
}
}
// Gameover
gameOver(){
clearTimeout(this.snake.t);
this.desktop.ele.innerHTML = '';
this.desktop.ele.remove();
type = 0;
}
}
var start = document.querySelector('.start');
var grade = document.querySelector('div i');
var sub = document.querySelector('.sub');
var add = document.querySelector('.add');
var level = document.querySelector('.level');
var type = 0;
var speed = 300;
var a = new Game();
start.onclick = function () {
if(type == 0){
a = new Game(1);
grade.innerHTML = '0';
type = 1;
}
}
if(type == 0){
sub.onclick = function () {
if(speed >= 300){
speed = 300;
level.innerHTML = '1';
}else{
speed +=50;
level.innerHTML --;
}
}
add.onclick = function () {
if(speed<=50){
speed =50;
level.innerHTML = '6';
}else{
speed -=50;
level.innerHTML ++ ;
}
}
}
function random(a,b) {
return Math.round(Math.random()*(a-b)+b);
}
function randomColor() {
return `rgb(${random(0,255)},${random(0,255)},${random(0,255)})`;
}
</script>
</html>
