貪吃蛇的例子：

在此例子中，利用snake數組的第0個元素和direction對象中的x值和y值做加法，算出蛇的下一個位置。利用間隔函數，不停的修改類名來進行渲染操作，感覺是一個很靈活的例子。

style.css

*{ margin: 0; padding: 0; box-sizing: border-box;}.page{ width: 100vw; height: 100vh; position: absolute; left: 0; top: 0;}body{ font-size: 0.16rem;}.startGame{ /* display: none; */ background: purple; display: flex; justify-content: center; align-items: center;}.startBtn,.reStartBtn{ width:2rem; height: 0.5rem; text-align: center; line-height: 0.5rem; background: deepskyblue; color: #fff;}.endGame{ display: none; /* display:flex; */ flex-direction: column; justify-content: center; align-items: center; background: lightsalmon;}.endGame h1{ margin: 1rem 0; color: #fff;}.gaming{ display: none; background: black; color: #fff; }.gaming .score{ display: flex; justify-content: space-between; height: 0.5rem; align-items: center; width: 100vw; padding: 0 0.25rem;}.gaming .score .pauseBtn{ width: 0.8rem; height: 0.3rem; line-height: 0.3rem; background: #999; text-align: center; }.gaming .mainGame{ /* 15*20 */ width: 3.45rem; height:4.6rem ; background: #555; margin: 0.3rem auto; display: flex; flex-wrap: wrap; border-top: 1px solid #ccc; border-left: 1px solid #ccc; box-sizing: content-box;}.gaming .mainGame .gezi{ width: 0.23rem; height: 0.23rem; border-right: 1px solid #ccc; border-bottom: 1px solid #ccc;}.gaming .mainGame .gezi.snake{ width: 0.23rem; height: 0.23rem; border-right: 1px solid #ccc; border-bottom: 1px solid #ccc; background-color: #fff;}.gaming .mainGame .gezi.food{ width: 0.23rem; height: 0.23rem; border-right: 1px solid #ccc; border-bottom: 1px solid #ccc; /* background-color: orangered; */}.gaming .mainGame .gezi.food:before{ width: 100%; height: 100%; content: ''; display: block; background:yellow; animation: food 1s alternate infinite ; box-shadow: 0 0 10px #ffffcc;}.gaming .mainGame .gezi.food[data-food=redStar]:before{ background:deeppink;}@keyframes food{ from{ transform: scale(1) rotate(0deg); } to{ transform: scale(0.5) rotate(360deg); }}.gaming .mainGame .gezi.snake:before{ content:'' ; display: block; width: 100%; height: 100%; background: #ccc; animation: snake 0.4s; box-sizing: border-box;}@keyframes snake{ from{ background: #fff; box-shadow:0 0 15px rgba(255,255,255,1); } to{ background: #ccc; box-shadow:0 0 15px rgba(255,255,255,0.5); }}

index.js主要實現了所有的貪吃蛇的頁面的各種操作

var startBtn = document.querySelector('.startBtn')var startPage = document.querySelector('.page.startGame')var gamingPage = document.querySelector('.gaming')var endGamePage = document.querySelector('.endGame')var mainGame = document.querySelector('.mainGame')var numDom = document.querySelector('.score .left .num')var endGameScore = document.querySelector('.endGame .num')var reStartBtn = document.querySelector(’.reStartBtn’);var pauseBtn=document.querySelector('.pauseBtn');var snake = [{x:0,y:1},{x:1,y:1},{x:2,y:1}];var snakeFood = { x:10,y:10}//初始化得分var score = 0;var interId;var ispaused=false;//定義蛇運動的方向//從右向左{x:-1,y:0}//從左向右{x:1,y:0}//從上到下{x:0,y:1}//從下到上{x:0,y:-1}var direction = {x:-1,y:0}startBtn.onclick = function(){ startPage.style.display = 'none' gamingPage.style.display = 'block' gameIng()}function renderGezi(){ for(var i=0;i<20;i++){ for(var j=0;j<15;j++){ var gezi = document.createElement('div'); gezi.className = 'gezi'; gezi.id = ’x’+j+’y’+i; mainGame.appendChild(gezi) } }}renderGezi()//隨機創建蛇，function createSnake(){ var randomX = parseInt(Math.random()*13) var randomY = parseInt(Math.random()*20) snake = []; for(var i= 0;i<3;i++){ snake.push({x:randomX+i,y:randomY}) } }function renderSnake(){ snake.forEach(function(item,i){ var snakeBody = document.querySelector('#x'+item.x+'y'+item.y); snakeBody.className = 'gezi snake'; })}//渲染食物function renderFood(){ var randomX = parseInt(Math.random()*15) var randomY = parseInt(Math.random()*20) var foodDiv = document.querySelector('#x'+randomX+'y'+randomY) if(foodDiv.className == 'gezi snake'){ renderFood() }else{ foodDiv.className = 'gezi food' } }createSnake()renderFood()renderSnake()function gameIng(){ interId = setInterval(function(){ var headerX = snake[0].x + direction.x; var headerY = snake[0].y + direction.y; if(headerX<0){ headerX = 14; } if(headerX>14){ headerX = 0; } if(headerY<0){ headerY = 19; } if(headerY>19){ headerY = 0; } var snakeHeader = {x:headerX,y:headerY}; isSnake(snakeHeader) if(!isFood(snakeHeader)) { //將刪除的蛇，找到相對應的dom，將其class類名修改成正常的gezi var snakeFooter = snake.pop()//返回刪除的對象 var snakeFooterDiv = document.querySelector('#x'+snakeFooter.x+'y'+snakeFooter.y); snakeFooterDiv.className = 'gezi'; } snake.unshift(snakeHeader)//在數組最前面加入 renderSnake() },100)}function isSnake(snakeHeader){ var newHeader = document.querySelector('#x'+snakeHeader.x+'y'+snakeHeader.y) if(newHeader.className == 'gezi snake'){ clearInterval(interId); gamingPage.style.display = 'none' endGamePage.style.display = 'flex' endGameScore.innerHTML = score; return true; }else{ return false; }}function isFood(snakeHeader){ var newHeader = document.querySelector('#x'+snakeHeader.x+'y'+snakeHeader.y) if(newHeader.className == 'gezi food'){ score ++; numDom.innerHTML = score; renderFood() return true; }else{ return false; }}var body = document.bodybody.addEventListener('keydown',function(e){ console.log(e) //方向不能直接顛倒向上時原來不能是向下的。 if(e.key == 'ArrowUp'&&direction.y!=1){ direction = {x:0,y:-1} } if(e.key=='ArrowRight'&&direction.x!=-1){ direction = {x:1,y:0} } if(e.key == 'ArrowDown'&&direction.y!=-1){ direction = {x:0,y:1} } if(e.key=='ArrowLeft'&&direction.x!=1){ direction = {x:-1,y:0} }})ylEvent.init(body);body.addEvent('swiperLeft',function(){ if(direction.x!=1){ direction = {x:-1,y:0} }})body.addEvent('swiperRight',function(){ if(direction.x!=-1){ direction = {x:1,y:0} }})body.addEvent('swiperTop',function(){ if(direction.y!=1){ direction = {x:0,y:-1} }})body.addEvent('swiperBottom',function(){ if(direction.y!=-1){ direction = {x:0,y:1} }})reStartBtn.onclick = function(){ location.reload();}pauseBtn.onclick=function(){ if(ispaused){ ispaused=false; gameIng(); }else{ ispaused=true; clearInterval(interId); }}

js輔助式響應.js

(function(){function xys(){ var userAgent=navigator.userAgent var html=document.querySelector('html'); //userAgent.indexOf('iPhone')通過此方法可以獲取iPhone在字符串中的索引值(開頭位置) //沒有找到返回-1 html.className=''; if((userAgent.indexOf('iPhone'))!=-1){ html.classList.add('iphone'); }else if((userAgent.indexOf('Android'))!=-1) { html.classList.add('android'); }else if((userAgent.indexOf('iPad'))!=-1){ html.classList.add('ipad'); }else{ html.classList.add('pc'); } if(window.innerWidth<640){ html.classList.add(’lt640’); html.classList.add(’lt960’); html.classList.add(’lt1200’); }else if(window.innerWidth<960){ html.classList.add(’lt960’); html.classList.add(’lt1200’); html.classList.add(’gt640’); }else if(window.innerWidth<1200){ html.classList.add(’lt1200’); html.classList.add(’gt640’); html.classList.add(’gt960’); }else{ html.classList.add(’gt640’); html.classList.add(’gt960’); html.classList.add(’gt1200’); } var screenWidth = window.innerWidth; var danwei = screenWidth/3.75;//屏幕的寬度/設計稿占滿全屏的寬度為多少rem var html = document.querySelector('html') html.style.fontSize = danwei + ’px’; } xys(); window.onresize=function(){ xys(); }})()

swiperEvent.js

var ylEvent = { eventAll:{ //'自定義的事件名稱':[’事件要觸發執行的函數1’,’事件要觸發執行的函數2’,’事件要觸發執行的函數3’] }, init:function(dom){ dom.eventAll = {}, dom.addEvent = this.addEvent; dom.emit = this.emit; dom.removeEvent = this.removeEvent dom.touchData = {}; //body.emit(’swiperLeft’,'msg') dom.addEventListener('touchstart',function(e){ //console.log(e) this.touchData.startX = e.touches[0].pageX; this.touchData.startY = e.touches[0].pageY }) dom.addEventListener(’touchmove’,function(e){ this.touchData.endX = e.touches[0].pageX; this.touchData.endY = e.touches[0].pageY; }) dom.addEventListener('touchend',function(e){ //console.log(e) var x = this.touchData.endX - this.touchData.startX; var y = this.touchData.endY - this.touchData.startY if( (Math.abs(x) > Math.abs(y)) && Math.abs(x)>100){ if(x>0){ //console.log(’向右滑動’) e.swiperDir = ’swiperRight’ body.emit(’swiperRight’,e) }else{ //console.log(’向左滑動’) e.swiperDir = ’swiperLeft’ body.emit(’swiperLeft’,e) } }else if((Math.abs(x) < Math.abs(y)) && Math.abs(y)>100){ if(y>0){ //console.log(’向下滑動’) e.swiperDir = ’swiperBottom’ body.emit(’swiperBottom’,e) }else{ //console.log(’向上滑動’) e.swiperDir = ’swiperTop’ body.emit(’swiperTop’,e) } } }) }, addEvent:function(eventName,callBackFn){ if(this.eventAll[eventName]==undefined){ this.eventAll[eventName] = [] } this.eventAll[eventName].push(callBackFn) }, emit:function(eventName,eventMsg){ if(this.eventAll[eventName]!=undefined){ this.eventAll[eventName].forEach(function(item,i){ item(eventMsg) }) } }, removeEvent:function(eventName,callBackFn){ var that = this this.eventAll[eventName].forEach(function(item,i){ if(item==callBackFn){ that.eventAll[eventName].splice(i,1) } }) }, }

index.html

<!DOCTYPE html><html> <head> <meta charset='utf-8' /> <title></title> <meta name='viewport' content='width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no' /> <script src='http://www.hdgsjgj.cn/bcjs/js/js輔助式響應.js' type='text/javascript' charset='utf-8'></script> <link rel='stylesheet' type='text/css' href='http://www.hdgsjgj.cn/bcjs/css/style.css' /> </head> <body> <!-- 1、貪吃蛇頁面結構和樣式 2、能夠繪制蛇 3、能夠繪制食物 4、讓蛇運動起來 5、蛇能夠吃食物 6、蛇碰到自己就會失敗 --> <div class='page startGame'> <div class='startBtn'>開始游戲</div> </div> <div class='page gaming'> <div class='score'> <div class='left'> score:<span class='num'>0</span> </div> <div class='pauseBtn'> 暫停 </div> </div> <div class='mainGame'> </div> </div> <div class='page endGame'> <h1>您最終獲取分數是<span class='num'>0</span>分</h1> <div class='reStartBtn'>重新開始</div> </div> <script src='http://www.hdgsjgj.cn/bcjs/js/swiperEvent.js' type='text/javascript' charset='utf-8'></script> <script src='http://www.hdgsjgj.cn/bcjs/js/index.js' type='text/javascript' charset='utf-8'></script> </body></html>

結果：

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好吧啦網。