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原生JS實(shí)現(xiàn)幻燈片

更新時(shí)間：2017年02月22日 09:40:35 作者：漫步未來

本文主要介紹了原生JS實(shí)現(xiàn)幻燈片的示例代碼，具有很好的參考價(jià)值，下面跟著小編一起來看下吧

效果如下：

代碼如下：

<!DOCTYPE html>
<html lang="en">
 <head>
 <meta charset="utf-8">
 <style type = "text/css">
 *{ padding: 0; margin: 0; }
 li { list-style: none; }
 .box {
 width: 800px;
 height: 450px;
 margin: 50px auto;
 position: relative;
  overflow:hidden;
 }
 .box span {
 width: 40px;
 height: 60px; 
 display: block;
 position: absolute;
 top: 225px;
 margin-top: -20px;
 cursor: pointer;
 z-index: 1;
 }
 .box #left {
 width: 76px;
 height: 112px;
 background: url('http://www.w2bc.com/upload/201609/20/jiaoben4524/images/buttons.png') no-repeat left 0;
 left: 0;
  margin-top: -66px;
 display: none;
 }
 .box #right {
 width: 76px;
 height: 112px;
 background: url('http://www.w2bc.com/upload/201609/20/jiaoben4524/images/buttons.png') no-repeat right 0;
 right: 0;
  margin-top: -66px;
 display: none;
 }
 .box #txt {
 width: 100%;
 height: 30px;
 background-color: #000;
 opacity: 0.4;
 position: absolute;
 bottom: 0;
 color: #fff;
 line-height: 30px;
 text-align: center;
 }
 #ad {
 width: 4000px;
 height: 450px;
 position: absolute;
 left: -1600px;
 }
 #ad li {
 float: left;
 }
  .box #left:hover {
 background: url('http://www.w2bc.com/upload/201609/20/jiaoben4524/images/buttons.png') no-repeat left -112px;
 }
 .box #right:hover {
 background: url('http://www.w2bc.com/upload/201609/20/jiaoben4524/images/buttons.png') no-repeat right -112px;
 }
 </style>
 <script type = "text/javascript">
 window.onload = function(){
 function $(id){ return document.getElementById(id);}
 var aLi = $("ad").children;
 function animate(obj,target,arrt){
  //關(guān)閉上一個(gè)定時(shí)器
  clearInterval(obj.timer);
  $("txt").innerHTML = obj.children[0].children[0].alt;

  //管理定時(shí)器
  obj.timer = setInterval(function(){
 //移動(dòng)步長(zhǎng)
  var step = (target - obj.offsetLeft) / 10;
  //步長(zhǎng)取整
  step = step > 0? Math.ceil(step):Math.floor(step);
  //移動(dòng)盒子 ： 盒子位置 + 步長(zhǎng)
  obj.style.left = obj.offsetLeft + step+ "px";
  //關(guān)閉定時(shí)器
  if(obj.offsetLeft%800 ==0){
  clearInterval(obj.timer);
  //判斷點(diǎn)擊的方向
  if(arrt === "left"){
  var oLi = $("ad").children[aLi.length - 1].cloneNode(true);
  //添加到最前面
  obj.insertBefore(oLi,obj.children[0]);
  //刪除最后一個(gè)盒子
  obj.removeChild(obj.children[aLi.length - 1]);
  //讓ul恢復(fù)初始值
  obj.style.left = "-1600px";
 }else{
  //克隆第一個(gè)盒子
  var oLi = obj.children[0].cloneNode(true);
  //添加到最后面
  obj.appendChild(oLi);
  //刪除第一個(gè)盒子
  obj.removeChild(obj.children[0]);
  //讓ul恢復(fù)初始值
  obj.style.left = "-1600px";
 }
 }
  },20);
 }
 var timer = setInterval(autoplay,2000);
 function autoplay(){
  animate($("ad"),-2400,"right");
 }
 $("ad").parentNode.onmouseover = function(){
 clearInterval(timer);
 $("left").style.display = "block";
  $("right").style.display = "block";
 }
 $("ad").parentNode.onmouseout = function(){
  $("left").style.display = "none";
  $("right").style.display = "none";
  timer = setInterval(autoplay,2000);
 }
 $("left").onclick = function(){
  clearInterval(timer);
  animate($("ad"),-800,"left");
 }
 $("right").onclick = function(){
  clearInterval(timer);
  animate($("ad"),-2400,"right");
 }
 }
 </script>
 </head>
 <body>
 <div class="box"> 
 <ul id="ad">
 <li><img src="http://www.w2bc.com/upload/201609/20/jiaoben4524/images/4.jpg" alt="閑靜似嬌花照水，行動(dòng)如弱柳扶風(fēng)。"></li>
 <li><img src="http://www.w2bc.com/upload/201609/20/jiaoben4524/images/5.jpg" alt="心較比干多一竅，病如西子勝三分。"></li>
 <li><img src="http://www.w2bc.com/upload/201609/20/jiaoben4524/images/1.jpg" alt="兩彎似蹙非蹙籠煙眉，一雙似喜非喜含情目。"></li>
 <li><img src="http://www.w2bc.com/upload/201609/20/jiaoben4524/images/2.jpg" alt="態(tài)生兩靨之愁，嬌襲一身之病。"></li>
 <li><img src="http://www.w2bc.com/upload/201609/20/jiaoben4524/images/3.jpg" alt="淚光點(diǎn)點(diǎn)，嬌喘微微。"></li>
 </ul>
 <p id="txt">淚光點(diǎn)點(diǎn)，嬌喘微微</p>
 <span id="left"></span>
 <span id="right"></span>
 </div>
 </body>
</html>

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