js中开关变量使用实例

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我是靠谱客的博主动人硬币，最近开发中收集的这篇文章主要介绍js中开关变量使用实例，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

效果图：

代码如下：

<!DOCTYPE html>
<html>
 <head>
 <meta charset="UTF-8">
 <title></title>
 <style>
 *{
 margin: 0;
 padding: 0;
 font-family: "微软雅黑";
 }
 #wrap{
 width: 400px;
 height: 500px;
 border: 1px solid #ccc;
 margin: 20px auto;
 position: relative;
 overflow: hidden;
 background: #f1f1f1;
 }
 #wrap a{
 width: 40px;
 height: 50px;
 background:rgba(0,0,0,.4);
 /*border: 1px solid #fff;*/
 position: absolute;
 top: 50%;
 margin-top: -25px;
 text-align: center;
 text-decoration: none;
 line-height: 50px;
 color: white;
 font-size: 30px;
 }
 #wrap a:hover{
 background:rgba(0,0,0,.9);
 }
 #prev{
 left: 10px;
 }
 #next{
 right: 10px;
 }
 #note,#span1{
 position: absolute;
 left: 0;
 width: 400px;
 height: 30px;
 line-height: 30px;
 text-align: center;
 color: white;
 background: rgba(0,0,0,.6);
 }
 #note{
 bottom: 0;
 }
 #span1{
 top: 0;
 }
 #img1{
 width: 400px;
 height: 500px;
 }
 section{
 width: 400px;
 height: 50px;
 margin: 30px auto 0;
 line-height: 50px;
 text-align: center;
 }
 section input{
 padding: 5px 15px;
 margin-right: 10px;
 }
 .pink{
 background: pink;
 color: white;
 }
 </style>
 </head>
 <script>
 window.onload=function(){
 var oPrev=document.getElementById('prev');
 var oNext=document.getElementById('next');
 var oNote=document.getElementById('note');
 var oSpan=document.getElementById('span1');
 var oImg=document.getElementById('img1');
 var arrURL=['https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1488463139&di=af377bee44237b092b20f1f7c86f2eb6&imgtype=jpg&er=1&src=http%3A%2F%2Fwww.wed114.cn%2Fjiehun%2Fuploads%2Fallimg%2F160304%2F52_160304170213_3.jpg','https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1488463080&di=a0ba47cd212e8f5755a2f42738511a2e&imgtype=jpg&er=1&src=http%3A%2F%2Fwww.6a8a.com%2Fuploadfile%2F2017%2F0809%2F2016071617592321137.jpg','https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1488463040&di=f9290db609a0994bdbd7221e644904ba&imgtype=jpg&er=1&src=http%3A%2F%2Fwww.wed114.cn%2Fjiehun%2Fuploads%2Fallimg%2F160405%2F52_160405165047_3.jpg','https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1488462814&di=e1dacd05467c01a13d9eb4d800853f20&imgtype=jpg&er=1&src=http%3A%2F%2Fwww.wed114.cn%2Fjiehun%2Fuploads%2Fallimg%2F160304%2F52_160304160734_5.jpg','https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1487868087852&di=3011f4a2b23b63559c32f8f154ad0a3a&imgtype=0&src=http%3A%2F%2Fwww.wed114.cn%2Fjiehun%2Fuploads%2Fallimg%2F160411%2F52_160411172520_1.jpg'];
 var arrNote=['多肉植物佛珠怎么养 翡翠珠的养殖方法','多肉植物紫弦月的养殖方法','多肉植物球松怎么养 球松的养殖方法','是一种小巧又可爱的 多肉植物','多肉植物蓝松怎么繁殖'];
 var num=0;
 var oBtn=document.getElementsByTagName('input');
 var onOff=true;
 oBtn[0].onclick=function(){
 onOff=true;
 this.className='pink';
 this.nextSibling.className='';
 }
 oBtn[1].onclick=function(){
 onOff=false;
 this.className='pink';
 this.previousSibling.className='';
 }
 function fnTab(){
 oSpan.innerHTML=num+1+'/'+arrURL.length;
 oImg.src=arrURL[num];
 oNote.innerHTML=arrNote[num];
 }
 fnTab();
 oPrev.onclick=function(){
 num--;
 if(num==-1){
  if(onOff){
  num=arrNote.length-1;
  }else{
  alert('已经是第一张图片了，亲！');
  num=0;
  }
 }
 fnTab();
 }
 oNext.onclick=function(){
 num++;
 if(num==arrNote.length){
  if(onOff)
  {
  num=0;
  }else{
  alert('已经是第一张图片了，亲！');
  num=arrNote.length-1;
  }
 }
 fnTab();
 }
 }
 </script>
 <body>
 <section>
 <input type="button" value="循环播放" class="pink"/><input type="button" value="顺序播放" />
 </section>
 <div id="wrap">
 <a href="javascript：;" rel="external nofollow" rel="external nofollow" id="prev"><</a>
 <a href="javascript：;" rel="external nofollow" rel="external nofollow" id="next">></a>
 <p id="note">图片文字加载中......</p>
 <span id="span1">数量正在计算中......</span>
 <img id="img1" />
 </div>
 </body>
</html>

以上就是本文的全部内容，希望本文的内容对大家的学习或者工作能带来一定的帮助，同时也希望多多支持脚本之家！