原生js实现贪吃蛇游戏

原生JavaScript实现贪吃蛇游戏的具体代码，供大家参考，具体内容如下

代码：

<script> var timer = null; var oMain = document.getElementById('main'); function Map(atom,xnum,ynum){//地图,设置单位大小，及根据单位大小创建地图 this.atom = atom; this.xnum = xnum; this.ynum = ynum; this.create = function(){ this.canvas = document.createElement('div'); this.canvas.style.cssText = 'position: relative;top: 40px;border: 1px solid red;background: #F1F1F1;' this.canvas.style.width = this.atom * this.xnum + 'px';//画布宽 this.canvas.style.height = this.atom * this.ynum + 'px';//画布高 main.appendChild(this.canvas); } } function Food(map){//食物 this.width = map.atom; this.height = map.atom; //实现随机背景色 this.bgColor = 'rgb('+Math.floor(Math.random()*200)+','+Math.floor(Math.random()*200)+','+Math.floor(Math.random()*200)+')'; this.x = Math.floor(Math.random()*map.xnum); this.y = Math.floor(Math.random()*map.ynum); this.flag = document.createElement(’div’); this.flag.style.width = this.width + ’px’; this.flag.style.height = this.height + ’px’; this.flag.style.backgroundColor = this.bgColor; this.flag.style.borderRadius = ’50%’; this.flag.style.position = 'absolute'; this.flag.style.left = this.x * this.width + ’px’; this.flag.style.top = this.y * this.height + ’px’; map.canvas.appendChild(this.flag); } //重新开始 function restart(map,snake){ for(var i=0; i<snake.body.length; i++){ map.canvas.removeChild(snake.body[i].flag); } snake.body = [ {x : 2,y : 0},//蛇头 {x : 1,y : 0},//蛇身 {x : 0,y : 0}//蛇尾 ] snake.direction = 'right'; snake.display(); map.canvas.removeChild(food.flag); food = new Food(map); } function Snake(map){ this.width = map.atom; this.height = map.atom; this.direction = 'right'; this.body = [ {x : 2,y : 0}, {x : 1,y : 0}, {x : 0,y : 0} ] this.display = function(){ for(var i=0; i<this.body.length; i++){ if(this.body[i].x != null){ var s = document.createElement(’div’); //将节点保存 this.body[i].flag = s; //设置样式 s.style.width = this.width + ’px’; s.style.height = this.height + ’px’; s.style.backgroundColor = 'rgb('+Math.floor(Math.random()*200)+','+Math.floor(Math.random()*200)+','+Math.floor(Math.random()*200)+')'; s.style.borderRadius = ’50%’; //设置位置 s.style.position = 'absolute'; s.style.left = this.body[i].x * this.width + ’px’; s.style.top = this.body[i].y * this.height + ’px’; //添加到地图 map.canvas.appendChild(s); } } } this.run = function(){ 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.direction){ case 'left':this.body[0].x -= 1;break; case 'right':this.body[0].x += 1;break; case 'up':this.body[0].y -= 1;break; case 'down':this.body[0].y += 1;break; } //吃食物 if(this.body[0].x == food.x && this.body[0].y == food.y){ this.body.push({x : null,y : null,flag : null}); map.canvas.removeChild(food.flag); food = new Food(map); } //判断游戏结束 if(this.body[0].x<0 || this.body[0].x>map.xnum-1 || this.body[0].y<0 || this.body[0].y>map.ynum-1){ clearInterval(timer); alert('GAME OVER!'); restart(map,this); return false; } for(var i=4; i<this.body.length; i++){ if(this.body[0].x == this.body[i].x && this.body[0].y == this.body[i].y){ clearInterval(timer); alert('GAME OVER!'); restart(map,this); return false; } } //删除原来 for(var i=0; i<this.body.length; i++){ if(this.body[i].flag != null){ map.canvas.removeChild(this.body[i].flag); } } this.display(); } } //创建地图对象 var map = new Map(20,40,20); map.create(); //创建食物对象 var food = new Food(map); //创建蛇对象 var snake = new Snake(map); snake.display(); //加上键盘事件(改变蛇头方向) window.onkeydown = function(e){ event = e || window.event; switch(event.keyCode){ case 38: if(snake.direction != 'down')//禁止掉头 snake.direction = 'up'; break; case 40: if(snake.direction != 'up') snake.direction = 'down'; break; case 37: if(snake.direction != 'right') snake.direction = 'left'; break; case 39: if(snake.direction != 'left') snake.direction = 'right'; break; } } var speed = 100; function start(){ clearInterval(timer); timer = setInterval(function(){ snake.run(); document.getElementById('score').innerHTML = snake.body.length-3; start(); },speed) } //难度 document.getElementById('1').onclick = function(){ speed = 100; } document.getElementById('2').onclick = function(){ speed = 50; } document.getElementById('3').onclick = function(){ speed = 20; } document.getElementById('begin').onclick = function(){ start(); } document.getElementById('pause').onclick = function(){ clearInterval(timer); }</script>

代码仅有js部分，完整代码可以上我的github免费下载

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