首頁  >  文章  >  web前端  >  js實作圖片首尾平滑輪播

js實作圖片首尾平滑輪播

小云云
小云云原創
2018-01-15 14:16:451443瀏覽

本文主要為大家帶來一篇實作圖片首尾平滑輪播(JS原生方法—節流)。小編覺得蠻不錯的,現在就分享給大家,也給大家做個參考。一起跟著小編過來看看吧,希望能幫助大家。

先給HTML程式碼,要注意輪播圖片表(#list)結尾加上第一個圖片1.jpg,在首部加上最後一張圖片5.jpg。


<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>首尾轮播</title>
 <link rel="stylesheet" href="首尾轮播.css" rel="external nofollow" >
<script src="首尾轮播.js"></script>
</head>
<body>
 <p id="container">
  <p id="list">
   <p><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="../imgs/5.jpg" alt=""></a></p>
   <p><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="../imgs/1.jpg" alt=""></a></p>
   <p><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="../imgs/2.jpg" alt=""></a></p>
   <p><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="../imgs/3.jpg" alt=""></a></p>
   <p><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="../imgs/4.jpg" alt=""></a></p>
   <p><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="../imgs/5.jpg" alt=""></a></p>
   <p><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="../imgs/1.jpg" alt=""></a></p>
  </p>

  <p class="arrow" id="prev"><</p>
  <p class="arrow" id="next">></p>


 </p>  

</body> 

</html>

接下來給出css和js程式碼,大家可以酌情根據圖片的大小、數量、寬度,調整container、list的參數,這也是封裝JS所要考慮的參數。


*{
 margin: 0;
 padding: 0;
}

#container{
 height: 400px;
 width: 500px;
 margin: 0 auto;
 position: relative;
 overflow: hidden;
 border: 1px solid black;
}

#list>p {
 float: left;
}
#list{
 position: absolute; 
 height: 400px;
 width: 3600px;
 
}

#list img{
 height: 400px;
 width: 500px;
}
.arrow {
 user-select:none;
 position: absolute;
 top:150px;
 z-index: 2;
 background-color: #aaa;
 height: 100px;
 width: 80px;
 cursor: pointer;
 opacity: 0.5;
 display: none;
 line-height: 100px;
 text-align: center;
 color: #222;
 font-size: 3em;

}
#container:hover .arrow{
 display: block;
}
 #prev{
 left:20px;
}

 #next{
 right: 20px;
}

在JS中,我們可以透過改變speed變數來控制圖片切換的速度....這裡用的是element.style.transition來控制的過渡效果.


window.onload=function(){
 var container = document.getElementById(&#39;container&#39;);
 var list = document.getElementById(&#39;list&#39;);//获取图片容器
 var prev = document.getElementById(&#39;prev&#39;);//向前按钮
 var next = document.getElementById(&#39;next&#39;);//向后按钮
 var nowP = 1; //显示位置
 var judge = null; //执行权
 var speed = 0.1; // 切换速度 秒
 prev.onclick=function(){
  if(!judge){
    judge = setTimeout(function(){
     if(nowP==1){setTimeout(function(){
      list.style.transition="left 0s";
     list.style.left = "-2500px"; 
     nowP = 5;},speed*1000);} //当到达图片表左边缘时与动画同步切换 
     list.style.transition = "left "+speed+"s";
    move(500);
    nowP--;
    judge = null;
   },speed*1000);
  }
 };
 next.onclick=function(){
  if(!judge){    
    judge = setTimeout(function(){
     if(nowP==5){setTimeout(function(){
      list.style.transition="left 0s";
     list.style.left = "-500px"; 
     nowP = 1;},speed*1000);} //当到达图片表右边缘时与动画同步切换 
    list.style.transition = "left "+speed+"s";
    move(-500);
    nowP++;
    judge = null;
   },speed*1000);
  }

 };

 function move(num){
  var term = parseInt(list.style.left) + num ; 
  list.style.left = term+"px";
 }

 var roll= setInterval(function(){
  next.onclick();
 },2000);

 container.onmouseenter=function(){
  clearInterval(roll);
 };

 container.onmouseleave=function()
  {
  roll=setInterval(function(){
  next.onclick();
  },2000);
 };

 
};

下面是一個示範demo,簡單來說原理就是在切換到圖片表首和表尾的動畫開始時,設定一個延遲執行時間與動畫過渡時間相同的setTimeout函數來執行瞬間切換,再透過節流來確保最大的切換速度(speed)。

本身也是初學前端,如果有幫助的話,點一下推薦吧

#相關推薦:

Bootstrap圖片輪播效果實作方法

使用JS實作圖片輪播的實例

#jQuery簡單實用的輪播器實作方法

以上是js實作圖片首尾平滑輪播的詳細內容。更多資訊請關注PHP中文網其他相關文章!

陳述:
本文內容由網友自願投稿,版權歸原作者所有。本站不承擔相應的法律責任。如發現涉嫌抄襲或侵權的內容,請聯絡admin@php.cn