js实现经典贪吃蛇小游戏

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

<script> class Map{ constructor(){ this.w = 800; this.h = 400; this.c = '#ccc'; this.createEle(); } createEle(){ this.mapEle = document.createElement('div'); this.mapEle.style.cssText = `width:${this.w}px;height:${this.h}px;background:${this.c};margin:0 auto;position:relative;border:solid 10px black;`; document.body.appendChild(this.mapEle); } } class Food{ constructor(){ this.w = 20; this.h = 20; this.c = 'red'; this.x = 0; this.y = 0; this.createEle(); } createEle(){ this.foodEle = document.createElement('div'); this.foodEle.style.cssText = `width:${this.w}px;height:${this.h}px;background:${this.c};position:absolute;left:${this.x * this.w}px;top:${this.y * this.h}px;`; 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{ 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'; 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:${this.body[i].y * this.h}px;`; } this.body[0].ele.innerHTML = '0'; setTimeout(()=>{this.move(); },300); } move(){ for(var i=this.body.length-1; i>0; i--){this.body[i].x = this.body[i-1].x;this.body[i].y = this.body[i-1].y; } switch(this.d){case 'left': this.body[0].x -= 1; break;case 'right': this.body[0].x += 1; break;case 'top': this.body[0].y -= 1; break;case 'bottom': this.body[0].y += 1; break; } if(this.body[0].x < 0 || this.body[0].y < 0 || this.body[0].x > ((m.w-this.w) / this.w) || this.body[0].y > ((m.h-this.h) / this.h)){alert('撞墙了');return; } if(this.body[0].x === f.x && this.body[0].y === f.y){this.body.push({ ele:null, x:this.body[this.body.length-1].x, y:this.body[this.body.length-1].y, c:randomColor()})f.randomPos(); } for(var i=1;i<this.body.length;i++){if(this.body[0].x == this.body[i].x && this.body[0].y == this.body[i].y){ alert('撞到自己了'); return;} } this.createEle(); } direct(type){ switch(type){case 37: if(this.d === 'right') break; this.d = 'left'; break;case 38: if(this.d === 'bottom') break; this.d = 'top'; break;case 39: if(this.d === 'left') break; this.d = 'right'; break;case 40: if(this.d === 'top') break; this.d = 'bottom'; break; } } } function random(a,b){ return Math.round(Math.random()*(a-b)+b) } function randomColor(){ return `rgb(${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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