实现图片首尾平滑轮播(JS原生方法—节流)

时间：2021-05-18

首先给出HTML代码，要注意轮播图片表(#list)末尾加上第一个图片1.jpg，在首部加上最后一个图片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> <div id="container"> <div id="list"> <div><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></div> <div><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></div> <div><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></div> <div><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></div> <div><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></div> <div><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></div> <div><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></div> </div> <div class="arrow" id="prev">&lt;</div> <div class="arrow" id="next">&gt;</div> </div> </body> </html>

接下来给出css和js代码，大家可以酌情根据图片的大小、数量、宽度，调整container、list的参数，这也是封装JS所要考虑的参数。

*{ margin: 0; padding: 0;}#container{ height: 400px; width: 500px; margin: 0 auto; position: relative; overflow: hidden; border: 1px solid black;}#list>div { 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，我们可以通过改变speed变量来控制图片切换的速度....这里用的是 element.style.transition来控制的过渡效果.

window.onload=function(){ var container = document.getElementById('container'); var list = document.getElementById('list');//获取图片容器 var prev = document.getElementById('prev');//向前按钮 var next = document.getElementById('next');//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); }; };

下面是一个演示demo，简单来说原理就是在切换到图片表首和表尾的动画开始时，设置一个延迟执行时间与动画过渡时间相同的setTimeout函数来执行瞬间切换，再通过节流来保证最大的切换速度(speed)。

本人也是初学前端，如果有帮助的话，点一下推荐吧

以上这篇实现图片首尾平滑轮播(JS原生方法—节流)就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。

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