JS实现一个简单贪吃蛇小游戏

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>eatSnake</title> <head> <style type="text/css"> *{ margin:0; padding:0; border: 0px; } body{ background: #444; } table{ border-collapse:collapse; overflow: hidden; border:1px solid #ddd; margin:10px auto 10px auto; } td{ display: table-cell; width:20px; height:20px; background: #fff; border:1px #eeeeee solid; } .snake{ background: #3388ee; } .notsnake{ background: #fff; } .food{ background: #33aa33; } .snake_head{ background: #dd4444; } .notice{ width:450px; text-align: center; margin:50px auto; color:#fff; font-size: 14px; } </style> </head> <body> <p class="notice">提示：空格键控制开始/ 暂停，方向键控制蛇的移动方向，F5刷新</p> <script type="text/javascript" src="snake.js"></script> </body> </html>

/* * @Author: CSU_XZY * @Date: 2020-10-17 12:38:26 * @LastEditors: CSU_XZY * @LastEditTime: 2020-10-18 22:40:24 * @FilePath: \第二天\snake\snake.js * @Description: just to play */ window.onload = function(){ var snake = function(width,height,snakeId,speed){ this.width = width || 10; this.height = height || 10; this.snakeId = snakeId || "snake"; this.goX = 0; this.goY = 0; this.speed = this.oldSpeed = speed || 10; this.Grid = []; //存放td的二维数组 this.snakeGrid = []; //存放蛇的数组 this.foodGrid = []; this.snakeTimer = null; this.derectkey = 39; this.stop = true; this.init(); document.getElementById("myAudio").play(); box.style.animationPlayState = 'running' } snake.prototype = { //创建二维数组 multiArray : function(m , n) { var array = new Array(m); //长 for(let i = 0; i < m; i++) { array[i] = new Array(n); //宽 } return array; }, //函数修正this bind : function(fn,context) { return function(){ return fn.apply(context,arguments); } }, //移动的主函数 move:function(){ var _this = this; if(_this.snakeTimer){clearInterval(_this.snakeTimer);} _this.snakeTimer = setInterval(_this.bind(_this.main,_this),Math.floor(3000/this.speed)); }, //重来 reset() { this.goX = 0; this.goY = 0; this.speed = this.oldSpeed; this.derectkey = 39; this.stop = true; this.init(); }, //确定键盘事件 keyDown : function(e) { var e = e || window.event; var keycode = e?e.keyCode:0; if(keycode == 116 ) window.location.reload(); if(keycode == 32) { if(this.stop) { this.move(); this.stop = false; } else{ if(this.snakeTimer) clearInterval(this.snakeTimer); this.stop = true; } } if(keycode>=37 && keycode <= 40) { if(!this.stop) this.derectkey = keycode; } return false; }, //创建地图 creatMap : function() { var table = document.createElement("table"); var tbody = document.createElement("tbody"); for(let i = 0; i < this.width; i++) { var tr = document.createElement("tr"); for(let j = 0; j < this.height; j++) { var td = document.createElement("td"); this.Grid[i][j] = tr.appendChild(td); } tbody.appendChild(tr); } table.appendChild(tbody); table.id = this.snakeId; document.body.appendChild(table); }, //产生随机点 randomPoint : function(initX,initY,endX,endY) { var p = []; //用来存放产生的随机点的数组 var initX = initX || 0; var initY = initY || 0; var endX = endX || this.width; var endY = endY || this.height; p[0] = Math.floor(Math.random()*(endX - initX)) + Math.floor(initX); p[1] = Math.floor(Math.random()*(endY - initY)) + Math.floor(initY) return p; }, //初始化食物的位置 initFood : function() { this.foodGrid = this.randomPoint(); if(this.isInSnake(this.foodGrid)) { this.initFood(); return false; } this.Grid[this.foodGrid[0]][this.foodGrid[1]].className = "food"; }, //判断点是否在蛇身上 isInSnake : function(point,pos) { var snakeGrid = this.snakeGrid; if(point instanceof Array) { let n = snakeGrid.length; for(let i = pos || 0; i < n; i++) { if(point[0] == snakeGrid[i][0] && point[1] == snakeGrid[i][1]) return true; } } return false; }, //给蛇涂颜色 paintSnake : function(){ var snakeGrid = this.snakeGrid; for(let i = 0; i < snakeGrid.length; i++) { this.Grid[snakeGrid[i][0]][snakeGrid[i][1]].className = "snake_body"; } }, //初始化蛇的位置 initSnake : function() { this.snakeGrid = []; this.snakeGrid.push([1,3]); this.snakeGrid.push([1,2]); this.snakeGrid.push([1,1]); this.paintSnake(); this.Grid[this.snakeGrid[0][0]][this.snakeGrid[0][1]].className = "snake_head"; this.Grid[this.snakeGrid[this.snakeGrid.length-1][0]][this.snakeGrid[this.snakeGrid.length-1][1]].className = "snake_tail"; }, //判断蛇是否撞墙 isInWall : function(point){ if(point instanceof Array){ if(point[0] < 0 || point[0] > this.width2 - 1 || point[1] < 0 || point[1] > this.height - 1) return true; } return false; }, //初始化条件 //控制函数运行的主函数 main : function(){ var snakeGrid = this.snakeGrid; var temp = snakeGrid[snakeGrid.length-1], isEnd = false; headX = snakeGrid[0][0]; headY = snakeGrid[0][1]; msg = ""; switch(this.derectkey) { case 37: if(this.goY!=1){this.goY=-1;this.goX=0} //防止控制蛇往相反反方向走 break; case 38: if(this.goX!=1){this.goX=-1;this.goY=0} break; case 39: if(this.goY!=-1){this.goY=1;this.goX=0} break; case 40: if(this.goX!=-1){this.goX=1;this.goY=0} } headX += this.goX; headY += this.goY; if(headX == this.foodGrid[0] && headY == this.foodGrid[1]) { this.snakeGrid.unshift(this.foodGrid); this.initFood(); if(this.snakeGrid.length>4){ //控制蛇加速 if(this.snakeGrid.length==5){ this.speed += 5; } else if(this.snakeGrid.length==10){ this.speed += 3; } else if(this.snakeGrid.length==20){ this.speed += 3; } else if(this.snakeGrid.length==30){ this.speed += 3; } this.move(); } } else { for(var i=this.snakeGrid.length-1;i>0;i--){ this.snakeGrid[i] = this.snakeGrid[i-1] ; } this.snakeGrid[0] = [headX,headY]; if(this.isInSnake(this.snakeGrid[0],1)){ isEnd=true; msg = "哈皮，吃到自己啦！！"; } //判断是否撞墙 else if(this.isInWall(this.snakeGrid[0])){ isEnd =true; msg = "撒比伟哥，撞墙了！！"; } if(isEnd) { if(this.snakeTimer) clearInterval(this.snakeTimer); var score; let len = this.snakeGrid.length; if(len <= 5) score = len-3; else if(len>5 && len<=10) { score = 2 + 2*(len-5) } else if(len>10 && len <= 20) score = 12 + 3*(len-10); else score = 27 + 5*(len - 15); if(confirm(msg+"你的分数是："+score+"！是否重新开始？")){ this.reset(); } return false; } this.Grid[temp[0]][temp[1]].className = "notSnake"; } this.paintSnake(); this.Grid[headX][headY].className = "snake_head"; this.Grid[this.snakeGrid[this.snakeGrid.length-1][0]][this.snakeGrid[this.snakeGrid.length-1][1]].className = "snake_tail"; }, init : function(){ var _this = this; snake_id = document.getElementById(_this.snakeId)||0 ; if(snake_id){ document.body.removeChild(snake_id); } _this.Grid = _this.multiArray(_this.width,_this.height); _this.creatMap(); _this.initSnake(); _this.initFood(); document.onkeydown = _this.bind(_this.keyDown,_this); } } new snake(20,20,"snake",10); }

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