原生JS实现的跳一跳小游戏完整实例

更新时间：2020-08-13 08:30:01 作者：startmvc

本文实例讲述了原生JS实现的跳一跳小游戏。分享给大家供大家参考，具体如下：以下说的

本文实例讲述了原生JS实现的跳一跳小游戏。分享给大家供大家参考，具体如下：

以下说的是闲暇编写的一个小游戏--跳一跳，类似于微信的跳一跳，大体实现功能有：

1.先随机生成地图；

2.按住按钮释放后完成动作并进行判断；

首先po一下代码；

代码如下：


<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 <meta http-equiv="X-UA-Compatible" content="ie=edge">
 <title>跳一跳</title>
 <style>
 *{padding: 0;margin: 0;}
 .game{
 position: relative;
 width: 800px;
 height: 400px;
 border: 1px solid black;
 margin: 0 auto;
 }
 .game .content{
 position: absolute;
 width: 700px;
 height: 400px;
 left: 0;
 top: 0;
 }
 .game #chess{
 position: absolute;
 width: 40px;
 height: 48px;
 overflow: hidden;
 z-index:99;
 transition-property: all;
 }
 .cylinder{
 position: relative;
 width: 70px;
 height: 101px;
 float: left;
 }
 .cylinder .top{
 position: absolute;
 width: 70px;
 height: 35px;
 border-radius: 50%;
 background: yellow;
 z-index: 4;
 } 
 .cylinder .front{
 position: absolute;
 width: 70px;
 height: 70px;
 background: black;
 margin-top: 17px;
 z-index: 3;
 }
 .cylinder .bottom{
 position: absolute;
 width: 70px;
 height: 35px;
 border-radius: 50%;
 background: black;
 margin-top: 65px;
 z-index: 4;
 }
 button{
 position: absolute;
 width: 80px;
 height: 30px;
 font-size: 16px;
 text-align: center;
 line-height: 30px;
 border-radius: 20%;
 bottom: 10px;
 right: 10px;
 }
 .move{
 animation-name: jump;
 }
 /* 跳棋运动动画 */
 @keyframes jump{
 0%{transform: rotate(0deg);}
 10%{transform: rotate(36deg);}
 20%{transform: rotate(72deg);}
 30%{transform: rotate(108deg);}
 40%{transform: rotate(144deg);}
 50%{transform: rotate(180deg);}
 60%{transform: rotate(216deg);}
 70%{transform: rotate(252deg);}
 80%{transform: rotate(288deg);}
 90%{transform: rotate(324deg);}
 100%{transform: rotate(360deg);}
 }
 @-webkit-keyframes jump{
 0%{transform: rotate(0deg);}
 10%{transform: rotate(36deg);}
 20%{transform: rotate(72deg);}
 30%{transform: rotate(108deg);}
 40%{transform: rotate(144deg);}
 50%{transform: rotate(180deg);}
 60%{transform: rotate(216deg);}
 70%{transform: rotate(252deg);}
 80%{transform: rotate(288deg);}
 90%{transform: rotate(324deg);}
 100%{transform: rotate(360deg);}
 }
 @-o-keyframes jump{
 0%{transform: rotate(0deg);}
 10%{transform: rotate(36deg);}
 20%{transform: rotate(72deg);}
 30%{transform: rotate(108deg);}
 40%{transform: rotate(144deg);}
 50%{transform: rotate(180deg);}
 60%{transform: rotate(216deg);}
 70%{transform: rotate(252deg);}
 80%{transform: rotate(288deg);}
 90%{transform: rotate(324deg);}
 100%{transform: rotate(360deg);}
 }
 @-moz-keyframes jump{
 0%{transform: rotate(0deg);}
 10%{transform: rotate(36deg);}
 20%{transform: rotate(72deg);}
 30%{transform: rotate(108deg);}
 40%{transform: rotate(144deg);}
 50%{transform: rotate(180deg);}
 60%{transform: rotate(216deg);}
 70%{transform: rotate(252deg);}
 80%{transform: rotate(288deg);}
 90%{transform: rotate(324deg);}
 100%{transform: rotate(360deg);}
 }
 </style>
</head>
<body>
 <div class="game">
 <div class="content">
 <!-- 圆柱体 -->
 <div class="cylinder">
 <!-- 顶部 -->
 <div class="top"></div>
 <!-- 前面 -->
 <div class="front"></div>
 <!-- 底部 -->
 <div class="bottom"></div>
 </div>
 </div>
 <!-- 跳棋 -->
 <div id="chess">
 <div style="width:20px;height:20px;border-radius:50%;background:red;position:absolute;margin-left:13px;z-index: 100;"></div>
 <div style="width:40px;height:40px;background:blue;overflow: hidden;margin-top: 32px;transform:rotate(67deg) skewX(40deg);">
 </div>
 </div>
 <button id="play">按住它</button>
 </div>
</body>
<script>
 var time = 0,score = 0,prev = 1;
 var cylinders = document.getElementsByClassName('cylinder');
 var chess = document.getElementById('chess');
 var arrLeft = [10,20,30,50];
 var arrTop = [210,290];
 // 初始函数，入口函数
 function init(){
 draw();
 BindEvent();
 };
 // 生成地图
 function draw(){
 var str = '';
 for(var n = 0; n < 7; n++){
 str +="<div class='cylinder'><div class='top'></div><div class='front'></div><div class='bottom'></div></div >"
 }
 document.getElementsByClassName('content')[0].innerHTML = str;
 for(var m = 0; m < 7; m++){
 var Left = arrLeft[Math.floor(Math.random() *arrLeft.length)];
 var Top = arrTop[Math.floor(Math.random() * arrTop.length)];
 cylinders[m].style.marginLeft = Left + 'px';
 cylinders[m].style.marginTop = Top + 'px';
 }
 // 画棋子
 chess.style.marginTop = cylinders[0].offsetTop - 25 + 'px';
 chess.style.marginLeft = cylinders[0].offsetLeft + 13 + 'px';
 }
 // 绑定事件函数
 function BindEvent(){
 document.getElementById('play').onmousedown = function () {
 var timer = setInterval(function () {
 time++;
 }, 100);
 document.getElementById('play').onmouseup = function () {
 clearInterval(timer);
 chess.classList.add('move');
 chess.style.animationDuration = time * 0.1 + 's';
 chess.style.transitionDuration = time * 0.1 + 's';
 if (cylinders[prev - 1].offsetTop > cylinders[prev].offsetTop) {
 var dx = setTran(prev - 1,prev);
 chess.style.marginLeft = chess.offsetLeft + time * 15 + 'px';
 chess.style.marginTop = chess.offsetTop + time * 15 * dx + 'px';
 } else if (cylinders[prev - 1].offsetTop < cylinders[prev].offsetTop) {
 var dy = setTran(prev - 1, prev);
 chess.style.marginLeft = chess.offsetLeft + time * 15 + 'px';
 chess.style.marginTop = chess.offsetTop + time * 15 * dy + 'px';
 }else if(cylinders[prev - 1].offsetTop == cylinders[prev].offsetTop){
 chess.style.marginTop = chess.offsetTop + 'px';
 chess.style.marginLeft = chess.offsetLeft + time * 15 + 'px';
 }
 chess.addEventListener(getTransition(), function () {
 chess.classList.remove('move');
 time = 0;
 judeg();
 chess.removeEventListener(getTransition(), arguments.callee, false);
 }, false);
 };
 };
 };
 // top和left移动的比例
 function setTran(prev,next) {
 var d_Top = cylinders[prev].offsetTop - cylinders[next].offsetTop;
 var d_Left = cylinders[prev].offsetLeft - cylinders[next].offsetLeft;
 return d_Top/d_Left;
 }
 // 判断动画是否结束
 function getTransition() {
 var t;
 var transitions = {
 'transition': 'transitionend',
 'OTransition': 'oTransitionEnd',
 'MozTransition': 'transitionend',
 'WebkitTransition': 'webkitTransitionEnd'
 };
 for (t in transitions) {
 if (chess.style[t] !== undefined) {
 return transitions[t];
 }
 }
 };
 // 判断是否跳出边界
 function judeg() {
 for(; prev < cylinders.length;){
 // 判断条件
 var e_Left = chess.offsetLeft > cylinders[prev].offsetLeft -20 && chess.offsetLeft < cylinders[prev].offsetLeft + 90;
 var e_Top = chess.offsetTop + 48 > cylinders[prev].offsetTop && chess.offsetTop + 48 < cylinders[prev].offsetTop + 35;
 if( e_Left && e_Top ){
 score++;
 if(prev >= cylinders.length){
 prev = 1;
 }else{
 prev++;
 }
 break;
 }else{
 alert('you lost');
 break;
 }
 }
 }
 init();
</script>
</html>

代码主要分为用来绘制圆柱体分布的draw()函数，用来绑定按钮事件的BindEvent()函数，用来监听CSS3动画是否结束的getTransition()函数，用来判断棋子是否出界的函数judeg()函数。而控制棋子运动的距离，主要是通过当你按下按钮时(onmousedown)触发一个定时器函数中的(time的加加)，弹起按钮时(onmouseup)棋子的left和top运动距离=设定像素值*time。

为了让棋子运动不那么生硬我添加了一些css3动画（rotate属性）以及transition属性。

实现效果如下：