源码：
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>贪吃蛇小游戏</title> <style> body { margin:0px; padding:0px; } #main { margin:100px; } .btn { width:100px; height:40px; } .gtitle { font-size:25px; font-weight: bold; } #gnum { color:red; } </style> </head> <body> <div> <h1>贪吃蛇</h1> <input type="button" value="开始游戏" /> <input type="button" value="暂停游戏" /> <span>第 <span>1</span> 关</span> <script> var main = document.getElementById('main'); var showcanvas = true; //是否开启画布格子 /** * 地图对象的构造方法 * @param atom 原子大小宽和高是一样的 10 * @param xnum 横向原子的数量 * @param ynum 纵向原子的数量 * @constructor */ function Map(atom, xnum, ynum){ this.atom = atom; // 20x20 this.xnum = xnum; // this.ynum = ynum; this.canvas = null; //创建画布的方法 this.create = function(){ this.canvas = document.createElement('div'); this.canvas.style.cssText="position:relative;top:40px;border:1px solid darkred; background:#FAFAFA"; this.canvas.style.width = this.atom * this.xnum + 'px'; //画布的宽 this.canvas.style.height = this.atom * this.ynum + 'px'; //画布的高 main.appendChild(this.canvas); if(showcanvas) { for(var y=0; y<ynum; y++) { for (var x = 0; x < xnum; x++) { var a = document.createElement('div'); a.style.cssText = "border:1px solid yellow"; a.style.width = this.atom + 'px'; a.style.height = this.atom + 'px'; a.style.backgroundColor = "LightSkyBlue"; this.canvas.appendChild(a); a.style.position = 'absolute'; a.style.left = x * this.atom + 'px'; a.style.top = y*this.atom+'px'; } } } } } /** * 创建食物的构造方法 * @param map 地图对象 * @constructor */ function Food(map){ this.width = map.atom; this.height = map.atom; 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); } function Snake(map) { //设置宽，高 this.width=map.atom; this.height = map.atom; //默认走的方向 this.direction = 'right'; this.body = [ {x:2, y:0}, //蛇头， 第一点 0 {x:1, y:0}, //蛇脖子, 第二点 1 {x:0, y:0} //蛇尾， 第三点 2 //{x:null, y:null, flag:null} 3 ]; //显示蛇 this.display = function(){ for(var i=0; i<this.body.length; i++){ if(this.body[i].x !=null) { //当吃到食物时， x==null, 不能新建， 不然会在0,0处理新建一个 var s = document.createElement('div'); // 将节点保存到一个状态变量中， 以便以后删除使用 this.body[i].flag = s; //设置蛇的样式 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'; //添加到地图中 map.canvas.appendChild(s); } } } //让蛇运动起来 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; } //默认是right left up down // 根据方向处理蛇头 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; } //判断蛇头吃到食物， xy和食物的XY重合 if(this.body[0].x ==food.x && this.body[0].y == food.y ){ //蛇加一节， 根据最后节点定 this.body.push({x:null, y:null, flag:null}); //判读一下设置级别 if(this.body.length > l.slength) { l.set(); } map.canvas.removeChild(food.flag); food = new Food(map); } //判断是否出界， 蛇头 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); //清除定时器 alert("怎么这么不小心撞墙了呢，摸摸头"); //重新开始游戏 restart(map, this) return false; } //判读是否和自己重合 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); //清除定时器 alert("呀，怎么喜欢咬自己的肉肉"); //重新开始游戏 restart(map, this) return false; } } for(var i=0; i<this.body.length; i++){ if(this.body[i].flag != null) { //当吃到食物， flag是等null, 且不能删除 map.canvas.removeChild(this.body[i].flag) } } this.display(); } } //重新开始游戏 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， 第一点 0 {x:1, y:0}, //蛇脖子, 第二点 1 {x:0, y:0} //蛇尾， 第三点 2 ]; snake.direction = 'right'; snake.display(); map.canvas.removeChild(food.flag); food = new Food(map); } //设置级别对象 function Level() { this.num = 1; //第几级别 this.speed= 300; //毫秒， 每升一关， 数量减少20， 速度就加快了 this.slength = 8; //每个关的长度判断 this.set = function() { this.num++; if(this.speed <= 50) { this.speed = 50; }else{ this.speed -=50; } this.slength += 10; //这个可以自己定义 this.display(); start(); //重新开始， 速度加快 } this.display = function() { document.getElementById('gnum').innerHTML = this.num; } } var l = new Level(); l.display(); //创建地图对象 var map = new Map(20, 40, 20); map.create(); //显示画布 //构造食物对象 var food = new Food(map); //构造蛇对象 var snake = new Snake(map); snake.display(); // 组body加键盘事件， 上下左右 window.onkeydown = function(e){ var event = e || window.event; // console.log(event.keyCode); switch(event.keyCode) { case 38: if(snake.direction != "down") { 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 timer; //变量可以提升 function start() { clearInterval(timer); timer = setInterval(function(){ snake.run(); },l.speed); } document.getElementById('begin').onclick=function(){ start(); } document.getElementById('pause').onclick=function() { clearInterval(timer); } </script> </div> </body> </html>
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