前端学习（1683）：前端系列实战课程之让蛇吃食物变长
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前端学习（1683）：前端系列实战课程之让蛇吃食物变长
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<html lang="en"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>游戲初始化界面</title><style>body {margin: 0;padding: 0;}#main {margin: 100px;}.btn {width: 100px;height: 40px;}</style>
</head><body><div id="main"><!-- 按鈕 --><input class="btn" type="button" value="開始游戲" id="begin"><input class="btn" type="button" value="暫停游戲" id="pause"></div><!-- 貪吃蛇游戲設計 --><script>var main = document.getElementById('main');/* 畫布格子是否開啟 */var showcanvas = true;/* atom 原子大小 xnum橫向原子數量 ynum縱向原子數量 */function Map(atom, xnum, ynum) {this.atom = atom;this.xnum = xnum;this.ynum = ynum;//聲明畫布this.canvas = null;//第二部分 創建畫布方法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'; //畫布的寬this.canvas.style.height = this.atom * this.ynum + 'px'; //畫布的寬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 創建蛇 */function Snake(map) {//設置寬度高度this.width = map.atom;this.height = map.atom;/* 蛇的方向 */this.direction = 'right';this.body = [{x: 2,y: 0}, //第一點{x: 1,y: 0}, //第二點{x: 0,y: 0} //第三點];//顯示蛇this.display = function() {for (var i = 0; i < this.body.length; i++) {//當吃到食物時候 x==null 不能新建 不然會在00處新建一個if (this.body[i].x != null) {var s = document.createElement('div');//將蛇的節點保存到狀態變量中 方便刪除使用this.body[i].flag = s;/* console.log(1); *///設置蛇的樣式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';//添加到地圖中map.canvas.appendChild(s);}}}/* 讓蛇動起來 {x: 2,y: 0}, //第一點{x: 1,y: 0}, //第二點{x: 0,y: 0} //第四點 讓蛇改變方向*/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;}//根據方向處理蛇頭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;}//判斷蛇頭吃到食物 蛇頭坐標和食物坐標重合 第六部分if (this.body[0].x == food.x && this.body[0].y == food.y) {//蛇會加一個this.body.push({x: null,y: null,flag: null});map.canvas.removeChild(food.flag);food = new Food(map);}/* console.log(111); *//* this.body[0].x += 1; */for (var i = 0; i < this.body.length; i++) {//不等于空 就刪除 當吃到食物的時候 flag等于空if (this.body[i].flag != null) {map.canvas.removeChild(this.body[i].flag);}}this.display();//給body加鍵盤事件 第五步 給蛇改變方向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;}}/* */}}var map = new Map(20, 40, 20);//創建畫布map.create();//構造食物var food = new Food(map);//構建蛇var snake = new Snake(map);snake.display();/* 第三部分 創建食物 map地圖對象 */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);//畫出食物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; //變量可以提升/* 第一部分 *//* 第一部分開始 */document.getElementById('begin').onclick = function() {console.log(222);clearInterval(timer);timer = setInterval(function() {snake.run();}, 300)}/*第一部分 暫停 */document.getElementById('pause').onclick = function() {clearInterval(timer);timer = setInterval(function() {}, 300)}</script>
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