原生JS实现贪吃蛇小游戏
编程学习 2021-07-04 15:02www.dzhlxh.cn编程入门
这篇文章主要为大家详细介绍了原生JS贪吃蛇小游戏，文中示例代码介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们可以参考一下
本文实例为大家分享了JS实现贪吃蛇小游戏的具体代码，供大家参考，具体内容如下
思路：在页面上添加一个地图，以提供边界，在地图中随机出现食物，给蛇身设置一个初始长度，用键盘方向键控制蛇的走向，当蛇触碰到食物时（既坐标重复时），增加蛇身长度，碰到墙壁或自身时，程序停止，游戏结束。
HTML结构：
<body> <div id="map"></div> </body>
CSS样式：
<style>
#map{
width: 600px;
height: 300px;
background: #ccc;
border: 5px solid blacks;
margin: 0 auto;
position: relative;}
</style>
js实现功能：
<script>
class Map{ //地图
constructor(){
this.mapEle = document.getElementById("map");
this.w = this.mapEle.offsetWidth;
this.h = this.mapEle.offsetHeight;
}
}
class Food{ //食物
constructor(){
this.w = 20;
this.h = 20;
this.x = 0;
this.y = 0;
this.c = "orange";
this.createEle();
}
createEle(){
this.foodEle = document.createElement("div");
this.foodEle.style.cssText = `width:${this.w}px;height:${this.h}px;background:${this.c};position:absolute;left:${this.x * this.w}px;top:${this.y * this.h}px;border-radius: 40%;`;
m.mapEle.appendChild(this.foodEle);
}
randomPos(){
this.x = random(0,(m.w-this.w) / this.w);
this.y = random(0,(m.h-this.h) / this.h);
this.foodEle.style.left = this.x * this.w + "px";
this.foodEle.style.top = this.y * this.h + "px";
}
}
class Snake{ //身体
constructor(){
this.w = 20;
this.h = 20;
this.body = [{
ele:null,x:4,y:3,c:randomColor()
},{
ele:null,x:3,y:3,c:randomColor()
},{
ele:null,x:2,y:3,c:randomColor()
}];
this.d = "right"; //设置默认行走方向
this.createEle();
}
createEle(){
for(var i=0;i<this.body.length;i++){
if(!this.body[i].ele){
this.body[i].ele = document.createElement("div");
m.mapEle.appendChild(this.body[i].ele);
}
this.body[i].ele.style.cssText = `width:${this.w}px;height:${this.h}px;background:${this.body[i].c};position:absolute;left:${this.body[i].x * this.w}px;top:${this.body[i].y * this.h}px;color:#fff;border-radius: 40%;`;
}
this.body[0].ele.innerHTML = "00"
setTimeout(()=>{this.move()},300);
}
move(){
for(var i=this.body.length-1;i>0;i--){
this.body[i].x = this.body[i-1].x;
this.body[i].y = this.body[i-1].y;
}
switch(this.d){
case "left":this.body[0].x -= 1;break;
case "right":this.body[0].x += 1;break;
case "top":this.body[0].y -= 1;break;
case "bottom":this.body[0].y += 1;break;
}
if(this.body[0].x < 0 || this.body[0].y < 0 || this.body[0].x > ((m.w-this.w) / this.w) || this.body[0].y > ((m.h-this.h) / this.h)){
alert("撞墙了");
return;
}
if(this.body[0].x === f.x && this.body[0].y === f.y){
this.body.push({ele:null,x:this.body[this.body.length-1].x,y:this.body[this.body.length-1].y,c:randomColor()});
f.randomPos();
}
for(var i=1;i<this.body.length;i++){
if(this.body[0].x == this.body[i].x && this.body[0].y == this.body[i].y){
alert("撞到自己了");
return;
}
}
this.createEle();
}
direct(type){
switch(type){
case 37:
if(this.d === "right") break;
this.d = "left";break;
case 38:
if(this.d === "bottom") break;
this.d = "top";break;
case 39:
if(this.d === "left") break;
this.d = "right";break;
case 40:
if(this.d === "top") break;
this.d = "bottom";break;
}
}
}
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)})`;
}
var m = new Map();
var f = new Food();
f.randomPos();
var s = new Snake();
document.onkeydown = function(eve){
var e = eve || window.event;
var code = e.keyCode || e.which;
s.direct(code);
}
</script>
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