<!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>
本文展示了js实现简易版贪吃蛇小游戏的相关代码，更多相关内容请关注喷绘。
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以上就是js实现简易版贪吃蛇小游戏的详细内容。
