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<head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>游戏初始化界面</title><style>body {margin: 0;padding: 0;}#main {margin: 100px;}.btn {width: 100px;height: 40px;}.gtitle {font-size: 25px;font-weight: bold;}#gnum {color: red;}
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</head><body><div id="main"><!-- 按钮 --><h1>贪吃蛇游戏</h1><input class="btn" type="button" value="开始游戏" id="begin"><input class="btn" type="button" value="暂停游戏" id="pause"><span class="gtitle">第<span id="gnum">1</span>关</span></div><!-- 贪吃蛇游戏设计 --><script>var main = document.getElementById('main');/* 画布格子是否开启 */var showcanvas = false;/* atom 原子大小 xnum横向原子数量 ynum纵向原子数量 */function Map(atom, xnum, ynum) {this.atom = atom;this.xnum = xnum;this.ynum = ynum;//声明画布this.canvas = null;//第二部分 创建画布方法this.create = function() {this.canvas = document.createElement('div');this.canvas.style.cssText = 'position:relative;top:40px;border:1px solid red;background:#FAFAFA';this.canvas.style.width = this.atom * this.xnum + 'px'; //画布的宽this.canvas.style.height = this.atom * this.ynum + 'px'; //画布的宽main.appendChild(this.canvas);if (showcanvas) {for (var x = 0; x < xnum; x++) {for (var y = 0; y < ynum; y++) {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 = 'green';this.canvas.appendChild(a);a.style.position = 'absolute';a.style.left = x * this.atom + 'px';a.style.top = y * this.atom + 'px';}}}}}/*第四部分 创建蛇 */function Snake(map) {//设置宽度高度this.width = map.atom;this.height = map.atom;/* 蛇的方向 */this.direction = 'right';this.body = [{x: 2,y: 0}, //第一点{x: 1,y: 0}, //第二点{x: 0,y: 0} //第三点];//显示蛇this.display = function() {for (var i = 0; i < this.body.length; i++) {//当吃到食物时候 x==null 不能新建 不然会在00处新建一个if (this.body[i].x != null) {var s = document.createElement('div');//将蛇的节点保存到状态变量中 方便删除使用this.body[i].flag = s;/* console.log(1); *///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.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);}}}/* 让蛇动起来{x: 2,y: 0}, //第一点{x: 1,y: 0}, //第二点{x: 0,y: 0} //第四点 让蛇改变方向*/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;}//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 蛇头坐标和食物坐标重合 第六部分if (this.body[0].x == food.x && this.body[0].y == food.y) {//蛇会加一个this.body.push({x: null,y: null,flag: null});//判断一下几倍if (this.body.length > l.slength) {l.set();}map.canvas.removeChild(food.flag);food = new Food(map);}//判断是否出界/* 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);alert("真笨啊,活活的撞墙了");restart(map, this);return false;}*///判断是否和自己重合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);alert("真笨啊,活活的吃到自己了");restart(map, this);return false;}}/* console.log(111); *//* this.body[0].x += 1; */for (var i = 0; i < this.body.length; i++) {//不等于空 就删除 当吃到食物的时候 flag等于空if (this.body[i].flag != null) {map.canvas.removeChild(this.body[i].flag);}}this.display();//给body加键盘事件 第五步 给蛇改变方向window.onkeydown = function(e) {var event = e || window.event;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;}}/**/}}//重新开始游戏 第六部分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}, //第一点{x: 1,y: 0}, //第二点{x: 0,y: 0} //第三点];snake.direction = 'right';snake.display();map.canvas.removeChild(food.flag);food = new Food(map);}//创建级别function Level() {this.num = 1; //第几级别this.speek = 300; //速度加快this.slength = 8; //每个关的长度判断this.set = function() {this.num++;if (this.speek <= 50) {this.speek = 50;} else {this.speek -= 50;}//可以自己定义this.slength += 3;this.display();start();}this.display = function() {document.getElementById('gnum').innerHTML = this.num;}}var l = new Level();l.display();var map = new Map(20, 40, 20);//创建画布map.create();//构造食物var food = new Food(map);//构建蛇var snake = new Snake(map);snake.display();/* 第三部分 创建食物 map地图对象 */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);//画出食物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);}var timer; //变量可以提升/* 第一部分 */function start() {clearInterval(timer);timer = setInterval(function() {snake.run();}, l.speek)}/* 第一部分开始 */document.getElementById('begin').onclick = function() {start();}/*第一部分 暂停 */document.getElementById('pause').onclick = function() {clearInterval(timer);timer = setInterval(function() {}, 300)}
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-----理解java的三大特性之继承)
