标签:style js 小游戏 蛇节 贪吃蛇 var piece snakebody 坐标
贪吃蛇
代码:
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> <meta name="description" content=""/> <meta name="keywords" content=""/>
<style type="text/css"> html { margin:0; padding: 0; } </style>
</head> <body>
</body>
<script type="text/javascript"> //1.背景 function Map() { var w = 800; var h = 400;
//绘制地图 this.showmap = function () { //创建div、设置css样式、追加给body var tu = document.createElement('div');
tu.style.width = w + "px"; tu.style.height = h + "px"; tu.style.background = "#ccc";
document.body.appendChild(tu); } }
//2.绘制食物 function Food() { var l = 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div、设置css样式、追加给body if (this.piece === null) { this.piece = document.createElement('div'); this.piece.style.width = this.piece.style.height = l + "px"; this.piece.style.backgroundColor = "red"; this.piece.style.position = "absolute";
document.body.appendChild(this.piece); } //食物设置绝对定位 //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 * l + "px"; this.piece.style.top = this.yFood * l + "px";
} }
//3.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div if (this.snakebody[i][3] === null) {//判断没有创建对应的蛇节 this.snakebody[i][3] = document.createElement('div'); //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> </html>
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标签:style,js,小游戏,蛇节,贪吃蛇,var,piece,snakebody,坐标
来源: https://www.cnblogs.com/li923/p/11413548.html
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