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這篇文章主要介紹了如何基于javascript實現貪吃蛇游戲,文中通過示例代碼介紹的非常詳細,對大家的學習或者工作具有一定的參考學習價值,需要的朋友可以參考下
html代碼:
<div class="content"> <div class="btn startBtn"> <!-- 開始按鈕 --> <button type="button"></button> </div> <div class="btn stopBtn"> <!-- 暫停按鈕 --> <button type="button"></button> </div> <div id="snakeWrap"></div> <!-- 主題內容 --> </div>
css代碼:
* { margin: 0; padding: 0; } body { background-color: #565F65; width: 100%; height: 10vh; overflow: hidden; } .content { width: 500px; height: 500px; position: absolute; top: 50%; left: 50%; margin-top: -250px; margin-left: -250px; background-color: #565F65; border: 10px solid #E7E7E7; box-shadow: inset 0px 0px 5px 2px #000; } .btn { width: 100%; height: 100%; position: absolute; top: 0; left: 0; background-color: rgba(0, 0, 0, .3); /*游戲未開始時和暫停時的遮罩*/ z-index: 2; } .btn button { background: none; border: none; background-size: 100% 100%; cursor: pointer; outline: none; position: absolute; left: 50%; top: 50%; } .startBtn button{ width: 170px; height: 80px; background-image: url(img/startbtn.png); margin-top: -40px; margin-left: -85px; } .stopBtn { display: none; } .stopBtn button{ width: 70px; height: 70px; background-image: url(img/stopbtn.png); margin-top: -35px; margin-left: -35px; } #snakeWrap { width: 500px; height: 500px; position: relative; } .snakeHead { /*蛇頭樣式*/ background-color: aqua; border-radius: 50%; } .snakeBody { /*蛇身樣式*/ background-color: navajowhite; border-radius: 50%; } .food { /*食物樣式*/ background-image: url(img/food.png); background-size: cover; }
javascript 代碼:
var sw = 20, //一個方塊的寬 sh = 20, //一個方塊的高 tr = 25, //行數 td = 25; //列數 var snake = null, //蛇的實例 food = null, //食物的實例 game = null; //游戲的實例 function Square(x, y, classname) { this.x = x * sw; //方塊實際的位置 this.y = y * sh; //方塊實際的位置 this.class = classname; this.viewContent = document.createElement('div'); //方塊對應的DOM元素 this.viewContent.className = this.class; this.parent = document.getElementById('snakeWrap'); //方塊的父級 } Square.prototype.create = function() { //創建方塊 DOM,并添加到頁面里 this.viewContent.style.position = 'absolute'; this.viewContent.style.width = sw + 'px'; this.viewContent.style.height = sh + 'px'; this.viewContent.style.left = this.x + 'px'; this.viewContent.style.top = this.y + 'px'; this.parent.appendChild(this.viewContent); }; Square.prototype.remove = function() { this.parent.removeChild(this.viewContent); } //蛇 function Snake() { this.head = null; //存一下蛇頭的信息 this.tail = null; //存一下蛇尾的信息 this.pos = []; //存儲蛇身上的每一個方塊的位置,二維數組 this.directionNum = { //存儲蛇走的方向,用一個對象來表示 left : { x : -1, y : 0, rotate : 180 }, right : { x : 1, y : 0, rotate : 0 }, up : { x : 0, y : -1, rotate : -90 }, down : { x : 0, y : 1, rotate : 90 } } } Snake.prototype.init = function() { //創建蛇頭 var snakeHead = new Square(2, 0, 'snakeHead'); snakeHead.create(); this.head = snakeHead; // 存儲蛇頭信息 this.pos.push([2, 0]); //把蛇頭的位置存起來 //創建蛇身體 var snakeBody1 = new Square(1, 0, 'snakeBody'); snakeBody1.create(); this.pos.push([1, 0]); //把蛇身1的位置存起來 var snakeBody2 = new Square(0, 0, 'snakeBody'); snakeBody2.create(); this.tail = snakeBody2; //把蛇尾的信息存起來 this.pos.push([0, 0]); //把蛇身1的位置存起來 //讓蛇頭蛇身形成鏈表關系 snakeHead.last = null; snakeHead.next = snakeBody1; snakeBody1.last = snakeHead; snakeBody1.next = snakeBody2; snakeBody2.last = snakeBody1; snakeBody2.next = null; //給蛇添加一條屬性,用來表示蛇走的方向 this.direction = this.directionNum.right; //默認讓蛇往右走 } //這個方法用來獲取蛇頭的下一個位置對應的元素, 要根據元素做不同的事情 Snake.prototype.getNextPos = function() { var nextPos = [ //蛇頭要走的下一個點的坐標 this.head.x/sw + this.direction.x, this.head.y/sh + this.direction.y ]; //下一個點是自己,代表撞到了自己,游戲結束 var selfCollind = false; //是否撞到自己 this.pos.forEach(function(value) { if(value[0] == nextPos[0] && value[1] == nextPos[1]) { //如果數組中的兩個數據都相等,就說明下一個點在蛇身上里面能找到,代表撞到自己了 selfCollind = true; } }); if(selfCollind) { console.log('撞到自己了!'); this.strategies.die.call(this); return; } //下一個點是墻,游戲結束 if(nextPos[0] < 0 || nextPos[1] < 0 || nextPos[0] > td - 1 || nextPos[1] > tr - 1) { console.log('撞墻了!'); this.strategies.die.call(this); return; } //下一個點是食物,吃 if(food && food.pos[0] == nextPos[0] && food.pos[1] == nextPos[1]) { //如果這個條件成立說明現在蛇頭要走的下一個點是食物的那個點 console.log('撞到食物了了!'); this.strategies.eat.call(this); return; } //下一個點什么都不是,走 this.strategies.move.call(this); }; //處理碰撞后要做的事 Snake.prototype.strategies = { move : function(format) { //這個參數用于決定要不要刪除最后一個方塊(蛇尾), 當傳了這個參數后就表示要做的事情是吃 //創建新身體(在蛇頭位置) var newBody = new Square(this.head.x/sw, this.head.y/sh, 'snakeBody'); //更新鏈表關系 newBody.next = this.head.next; newBody.next.last = newBody; newBody.last = null; this.head.remove(); //舊舌頭從原來的位置刪除 newBody.create(); //創建一個新蛇頭(蛇頭下一個要走到的點) var newHead = new Square(this.head.x/sw + this.direction.x, this.head.y/sh + this.direction.y, 'snakeHead') //更新鏈表關系 newHead.next = newBody; newHead.last = null; newBody.last = newHead; newHead.viewContent.style.transform = 'rotate('+this.direction.rotate+'deg)'; newHead.create(); //蛇身上每一個方塊的坐標也要更新 this.pos.splice(0,0, [this.head.x/sw + this.direction.x, this.head.y/sh + this.direction.y]); this.head = newHead; //還要把this.head的信息更新一下 if(!format) { //如何format 的值為 false, 表示需要刪除(除了吃之外的操作) this.tail.remove(); this.tail = this.tail.last; this.pos.pop(); } }, eat : function() { this.strategies.move.call(this, true); createFood(); game.score ++; }, die : function() { game.over(); } } snake = new Snake(); //創建食物 function createFood() { //食物小方塊的隨機坐標 var x = null; var y = null; var include = true; //循環跳出的條件, true表示食物的坐標在蛇身上(需要繼續循環),false表示食物坐標不在蛇身上(不循環了) while(include) { x = Math.round(Math.random() * (td - 1)); //0-29 y = Math.round(Math.random() * (tr - 1)); snake.pos.forEach(function(value) { if(x != value[0] && y != value[1]) { //這個條件成立說明現在隨機出來的這個坐標,在蛇身上并沒有找到 include = false; } }); } //生成食物 food = new Square(x, y, 'food'); food.pos = [x,y]; //存儲一下生成食物的坐標,用于跟蛇頭要走的下一個點作對比 var foodDom = document.querySelector('.food'); if(foodDom) { foodDom.style.left = x*sw + 'px'; foodDom.style.top = y*sh + 'px'; }else { food.create(); } } //創建游戲邏輯 function Game() { this.timer = null; this.score = 0; this.speed = 200; } Game.prototype.init = function() { snake.init(); snake.getNextPos(); createFood(); document.onkeydown = function(ev) { //用戶按下方向鍵觸發事件 if(ev.which == 37 && snake.direction != snake.directionNum.right) { //用戶按下左鍵是,蛇不能是往右走 snake.direction = snake.directionNum.left; }else if(ev.which == 38 && snake.direction != snake.directionNum.dowm) { snake.direction = snake.directionNum.up; }else if(ev.which == 39 && snake.direction != snake.directionNum.left) { snake.direction = snake.directionNum.right; }else if(ev.which == 40 && snake.direction != snake.directionNum.up) { snake.direction = snake.directionNum.down; } } this.start(); } Game.prototype.start = function() { //開始游戲 this.timer = setInterval(function() { snake.getNextPos(); }, this.speed); } Game.prototype.pause = function() { clearInterval(this.timer); } Game.prototype.over = function() { //開始游戲 clearInterval(this.timer); alert('你的得分為' + this.score); //游戲回到最初的狀態 var snakeWrap = document.getElementById('snakeWrap'); snakeWrap.innerHTML = ''; snake = new Snake(); game = new Game(); var startBtnWrap = document.querySelector('.startBtn'); startBtnWrap.style.display = 'block'; } //開啟游戲 game = new Game(); var startBtn = document.querySelector('.startBtn button'); startBtn.onclick = function() { startBtn.parentNode.style.display = 'none'; game.init(); }; //暫停 var snakeWrap = document.getElementById('snakeWrap'); var puseBtn = document.querySelector('.stopBtn button') snakeWrap.onclick = function() { game.pause(); puseBtn.parentNode.style.display = 'block'; } puseBtn.onclick =function() { game.start(); puseBtn.parentNode.style.display = 'none'; }
以上就是本文的全部內容,希望對大家的學習有所幫助,也希望大家多多支持億速云。
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