原生js编写贪吃蛇小游戏
本文实例为大家分享了js编写贪吃蛇小游戏的具体代码，供大家参考，具体内容如下
刚学完js模仿着教程，把自己写的js原生小程序。
HTML部分
<!DOCTYPE html><html lang='en'><head> <meta charset='UTF-8'> <meta http-equiv='X-UA-Compatible' content='IE=edge'> <meta name='viewport' content='width=device-width, initial-scale=1.0'> <title>Document</title> <link rel='stylesheet' href='https://www.haobala.com/bcjs/css/index.css' ></head><body> <div class='content'> <!-- 游戏开启按钮 --><div class='btn startBtn'><button></button></div><!-- 蛇身 --><div id='snakeWrap'></div> </div> <!-- 引入外部js文件 --> <script src='https://www.haobala.com/bcjs/js/index.js'></script></body></html>
css部分
/* 整体样式 */.content{ width: 640px; height: 640px; margin: 100px auto; position: relative;} .btn{ width: 100%; height: 100%; position: absolute; left: 0; top: 0; background-color: rgba(0, 0, 0, 0.3); 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: 200px; height: 80px; background: url(../images/Snipaste_2021-05-08_08-52-45.png) no-repeat; background-size: contain; margin-left: -100px; margin-top: 222px;}#snakeWrap{ width: 600px; height: 600px; background: #73aad4; border: 20px solid #13649c; position: relative;}.snakeHead{ background-color: yellowgreen; border-radius: 50%;}.snakeBody{ background-color: black; border-radius: 50%;}.food{ background-color: red; border-radius: 50%;}
js部分
var sw = 20,//一个方块的宽 sh = 20,//一个方块的宽 tr = 30,//行数 td = 30;//列数var snake = null, //生成蛇的实例 food = null; //生成食物的实例 game = null; //创建游戏实例 //把整体看成是一个一个小方块 移动的的时候创建和删除方块(后续所有方块的生成都会调用)// 方块构造函数function Square(x,y,classname){ //对应css中三种蛇的样式（蛇头 蛇身 蛇尾） this.x = x * sw; this.y = y * sh; this.class = classname; this.viewContent = document.createElement(’div’); this.viewContent.className = this.class; //将创建出来的div添加对应css样式 this.parent = document.getElementById(’snakeWrap’); }//在方块构造函数的 原型链 上创建create方法 确定新div的具体信息//this指向SquareSquare.prototype.create = function(){ 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); //把新创建的div添加到页面}//在方块构造函数的 原型链 上创建remove方法 用于移动时删除方块Square.prototype.remove = function(){ this.parent.removeChild(this.viewContent);}// 蛇function Snake(){ this.head = null; //存储蛇头信息 this.tail = null; //存储蛇尾信息 this.pos = []; //存储蛇身上的每一个方块的位置 this.directionNum = { //存储蛇走的方向left : { x : -1, y : 0},right : { x : 1, y : 0},up : { x : 0, y : -1},down : { x : 0, y : 1} }}//this 指向 SnakeSnake.prototype.init = function(){ //初始化 // 创建蛇头 var snakeHead = new Square(2,0,’snakeHead’); snakeHead.create(); this.head = snakeHead; this.pos.push([2,0]); //储存蛇头信息 // 创建蛇身1 var snakeBody1 = new Square(1,0,’snakeBody’); snakeBody1.create(); this.pos.push([1,0]); //储存蛇身信息 // 创建蛇尾 var snakeBody2 = new Square(0,0,’snakeBody’); snakeBody2.create(); this.tail = snakeBody2; this.pos.push([0,0]); /储存蛇尾信心 //形成链表关系 //蛇头 蛇身 蛇尾的前后关系 snakeHead.last = null; snakeHead.next = snakeBody1; snakeBody1.last = snakeHead; snakeBody1.next = snakeBody2; snakeBody2.last = snakeBody1; snakeBody2.next = null; //给蛇 添加一个默认方向 向右 this.direction = this.directionNum.right;}// 获取蛇头的下一个位置对应的元素（this指向Snake）// 获取下一个点的坐标并储存到nextPos数组Snake.prototype.getNextPos = function(){ var nextPos = [this.head.x/sw + this.direction.x, //this.direction.x、y 下面会将方向与键盘事件绑定 来确定下一个点生成的位置this.head.y/sh + this.direction.y ]// 下个点是自己，撞到了自己 游戏结束 var selfCollied = false; this.pos.forEach(function(value){ //forEach遍历数组 两数组比较看是否有重复坐标if (value[0] == nextPos[0] && value[1] == nextPos[1]){ selfCollied = true;} }) //撞到了自己 游戏结束 if(selfCollied){this.、.die.call(this);return; } // 下个点是围墙 游戏结束if(nextPos[0] > 29 || nextPos[0] < 0 || nextPos[1] > 29 || nextPos[1] < 0){this.strategies.die.call(this);return; } // 下个点是食物 吃 if(food && food.pos[0] == nextPos[0] && food.pos[1] == nextPos[1]){this.strategies.eat.call(this);return; } // 下个点什么都不是 走 this.strategies.move.call(this);}// 碰撞后要做的事Snake.prototype.strategies = { move : function(format){ //参数用于判断是否删除蛇尾// 创建一个newbody,删掉蛇头var newBody = new Square(this.head.x/sw,this.head.y/sh,’snakeBody’)newBody.next = this.head.next;newBody.next.last = newBody;newBody.last = null;this.head.remove();newBody.create();// 创建一个新蛇头var newx = this.head.x/sw + this.direction.x;var newy = this.head.y/sh + this.direction.y;var newHead = new Square(newx,newy,’snakeHead’)newHead.next = newBody;newBody.last = newHead;newHead.last = null;newHead.create();// 更新蛇身的坐标this.pos.splice(0,0,[newx,newy]);this.head = newHead;//如果为false 则吃if(!format){ this.tail.remove(); this.tail = this.tail.last; this.pos.pop();} }, eat : function(){this.strategies.move.call(this,true);game.score ++;createFood(); }, die : function(){game.over(); }}snake = new Snake();// 创建食物function createFood(){ // 食物小方块坐标 var x = null; var y = null; var include = true; while(include){x = Math.round(Math.random()*(td - 1));y = Math.round(Math.random()*(tr - 1));snake.pos.forEach(function(value){ if(x != value[0] && y != value[1]){include = false; }}); } // 生成食物 food = new Square(x,y,’food’); food.pos = [x,y]; var foodDom = document.querySelector(’.food’); if(foodDom){foodDom.style.left = x * sw + ’px’;foodDom.style.top = y * sh + ’px’; }else{food.create(); }}// 创建游戏逻辑function Game(){ this.timer = null; this.score = 0;}Game.prototype.init = function(){ snake.init(); createFood(); //这里曾经的e.keycode e.which 都已禁用 使用e.key window.addEventListener(’keydown’,function(e){if(e.key == ’ArrowLeft’ && snake.direction != snake.directionNum.right){ snake.direction = snake.directionNum.left;}else if(e.key == ’ArrowUp’ && snake.direction != snake.directionNum.down){ snake.direction = snake.directionNum.up;}else if(e.key == ’ArrowRight’ && snake.direction != snake.directionNum.left){ snake.direction = snake.directionNum.right;}else if(e.key == ’ArrowDown’ && snake.direction != snake.directionNum.up){ snake.direction = snake.directionNum.down;} }); this.start();}Game.prototype.start = function(){ this.timer = setInterval(function(){snake.getNextPos(); },0.0000000000000001)}Game.prototype.over = function(){ clearInterval(this.timer); alert(’你的得分为’ + this.score); // 游戏回到最初始状态 var snakeWrap = document.getElementById(’snakeWrap’); snakeWrap.innerHTML = ’’; snake = new Snake(); game = new Game(); var startBtnWrap = document.querySelector(’.startBtn’); startBtnWrap.style.display = ’block’;}// 开启游戏game = new Game();var startBtn = document.querySelector(’.startBtn button’);startBtn.onclick = function(){ startBtn.parentNode.style.display = ’none’; game.init();}
简单的一个小游戏，如有问题请大佬指正。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持好吧啦网。
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