JS实现简易版贪吃蛇小游戏

 !DOCTYPE html PUBLIC -//W3C//DTD XHTML 1.0 Strict//EN http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd  html  head  title 新建网页 /title  meta http-equiv= Content-Type content= text/html; charset=utf-8 /  meta name= description content= /  meta name= keywords content= /  script type= text/javascript  //① 绘制地图 function Map() { //私有成员(不会随便发生变化) var w = 800; var h = 400; //成员方法，绘制地图 this.showmap = function () { //创建p、设置css样式、追加给body var tu = document.createElement( p  tu.style.width = w + px  tu.style.height = h + px  tu.style.backgroundImage = url(./12.jpg)  document.body.appendChild(tu); //② 绘制食物 function Food() { var len = 20; //把食物(权值)坐标声明为公开的，以便在外部访问 this.xFood = 0; this.yFood = 0; this.piece = null; //页面上唯一的食物对象 //绘制 this.showfood = function () { //创建p、设置css样式、追加给body if (this.piece === null) { this.piece = document.createElement( p  this.piece.style.width = this.piece.style.height = len + px  this.piece.style.backgroundColor = green  this.piece.style.position = absolute  document.body.appendChild(this.piece); //食物设置绝对定位(position/left/top) //食物位置“随机”摆放 //移动步进值：20px //食物“权值”坐标： X轴(0-39) Y轴(0-19)  //食物真实坐标：权值坐标 * 步进值 this.xFood = Math.floor(Math.random() * 40); //0-39的随机数 this.yFood = Math.floor(Math.random() * 20); //0-19的随机数 this.piece.style.left = this.xFood * len + px  this.piece.style.top = this.yFood * len + px  //③ 小蛇 function Snake() { var len = 20; this.redirect = right //默认向右边移动 //后期snakebody要变化，因此声明为公开的(每个蛇节：[x坐标，y坐标，颜色，蛇节对象]) this.snakebody = [[0, 1, green , null], [1, 1, green , null], [2, 1, green , null], [3, 1, red , null]]; //a.绘制小蛇 this.showsnake = function () { //遍历小蛇的各个蛇节，并依次创建即可 for (var i = 0; i this.snakebody.length; i++) { //this.snakebody[i]//代表每个蛇节 //创建蛇节p if (this.snakebody[i][3] === null) {//判断没有创建对应的蛇节 this.snakebody[i][3] = document.createElement( p  //设置css样式(宽度、高度、颜色) this.snakebody[i][3].style.width = this.snakebody[i][3].style.height = len + px  this.snakebody[i][3].style.backgroundColor = this.snakebody[i][2]; //绝对定位及位置 this.snakebody[i][3].style.position = absolute  //把蛇节追加给body document.body.appendChild(this.snakebody[i][3]); this.snakebody[i][3].style.left = this.snakebody[i][0] * len + px  this.snakebody[i][3].style.top = this.snakebody[i][1] * len + px  //b.移动小蛇 this.movesnake = function () { //非蛇头蛇节(当前蛇节的新坐标 是 下个蛇节 的旧坐标) for (var i = 0; i this.snakebody.length - 1; i++) { this.snakebody[i][0] = this.snakebody[i + 1][0]; this.snakebody[i][1] = this.snakebody[i + 1][1]; if (this.redirect == right ) { //蛇头x坐标递增 this.snakebody[this.snakebody.length - 1][0] += 1; if (this.redirect == left ) { //蛇头x坐标递减 this.snakebody[this.snakebody.length - 1][0] -= 1; if (this.redirect == up ) { //蛇头y坐标递减 this.snakebody[this.snakebody.length - 1][1] -= 1; if (this.redirect == down ) { //蛇头y坐标递增 this.snakebody[this.snakebody.length - 1][1] += 1; //判断蛇头碰到食物 //蛇头坐标 var xSnake = this.snakebody[this.snakebody.length - 1][0]; var ySnake = this.snakebody[this.snakebody.length - 1][1]; //食物坐标food.xFood/food.yFood; if (xSnake == food.xFood ySnake == food.yFood) { //吃食物增加蛇节 var newjie = [this.snakebody[0][0], this.snakebody[0][1], green , null]; this.snakebody.unshift(newjie);//把newjie放到数组的第一个位置去 //原食物消失，重新生成一个食物 food.showfood(); //控制小蛇在地图范围内移动 if (xSnake 0 || xSnake 39 || ySnake 0 || ySnake 19) { alert( game over  clearInterval(mytime); return false; //吃到自己判断(蛇头坐标与其他蛇节坐标一致) for (var k = 0; k this.snakebody.length - 1; k++) { if (this.snakebody[k][0] == xSnake this.snakebody[k][1] == ySnake) { alert( game over kill you by yourself  clearInterval(mytime); return false; //根据新坐标绘制小蛇 this.showsnake(); window.onload = function () { var map = new Map(); map.showmap(); food = new Food();//声明为全局的以便在该加载事件函数外部访问 food.showfood(); snake = new Snake();//声明为全局的snake对象 snake.showsnake(); //移动小蛇 //setInterval(全局变量，时间) mytime = setInterval( snake.movesnake() , 200); //设置键盘事件，控制器小蛇移动方向 document.onkeydown = function (evt) { var num = evt.keyCode;//通过事件对象获得数值码，进而知道被触发键子 if (num == 38) { snake.redirect = up  if (num == 40) { snake.redirect = down  if (num == 37) { snake.redirect = left  if (num == 39) { snake.redirect = right  /script  style type= text/css  body { margin: 0; /style  /head  body /body  /html 

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