js实现无缝轮播图

本文实例为大家分享了js实现轮播图的具体代码，供大家参考，具体内容如下

CSS样式：

<style type='text/css'> #box{width: 1000px;height: 375px;border: 3px solid black; margin: 30px auto;position: relative;overflow: hidden;} #box .img{position: absolute;left: 0;top: 0;} #box .img img{width: 1000px;height: 375px;float: left;} #box .btn input{border-radius: 50%;border: 0;width: 40px; height: 40px;font-size: 25px;z-index: 5;top: 165px;position: absolute;} #left{left: 0;} #right{right: 0;}</style>

HTML结构：

<div id='box'> <div class='img'> <img src='https://www.haobala.com/bcjs/img/1.jpg' > <img src='https://www.haobala.com/bcjs/img/2.jpg' > <img src='https://www.haobala.com/bcjs/img/3.jpg' > <img src='https://www.haobala.com/bcjs/img/4.jpg' > <img src='https://www.haobala.com/bcjs/img/1.jpg' > //利用第一张图，达到无缝轮播的视觉效果 </div> <div class='btn'> <input type='button' value='<' /> <input type='button' value='>' /> </div></div>

JavaScript：

<script> class LunBO{ constructor() { this.img = document.querySelector('.img'); this.child = this.img.children; this.left = document.getElementById('left'); this.right = document.getElementById('right'); this.index = 0; } init(){ this.img.style.width = this.child.length * this.child[0].offsetWidth + 'px'; //有多少图片设置多少宽度 } addEvent(){ var that = this; this.left.onclick = function(){ that.changeIndex(1); //点击左按钮，设置索引 } this.right.onclick = function(){ that.changeIndex(2); //点击右按钮，设置索引 } } changeIndex(i){ if(i==1){ if(this.index == 0){ this.index = this.child.length - 2; this.img.style.left = -(this.child.length-1) * this.child[0].offsetWidth + 'px'; }else{ this.index--; } }else{ if(this.index == this.child.length-1){ this.index = 1; this.img.style.left = 0; }else{ this.index++; } } this.setSplace(); } setSplace(){ move(this.img,'left',-this.index * this.child[0].offsetWidth); //调用动画 } } var lb = new LunBO(); lb.init(); lb.addEvent();</script>

设置动画：

function move(ele,attr,target){ clearInterval(ele.t); ele.t=setInterval(()=>{ let iNow; if(attr=='opacity'){ iNow=getStyle(ele,attr)*100; }else{ iNow=parseInt(getStyle(ele,attr)); } let speed=(target-iNow)/8; speed=speed<0?Math.floor(speed):Math.ceil(speed); if(iNow==target){ clearInterval(ele.t); }else{ if(attr=='opacity'){ ele.style.opacity=(iNow+speed)/100; }else{ ele.style[attr]=iNow+speed+'px'; } } },30)}function getStyle(ele,attr){ if(ele.currentStyle){ return ele.currentStyle[attr]; }else{ return getComputedStyle(ele,false)[attr]; }}

精彩专题分享：jQuery图片轮播 JavaScript图片轮播 Bootstrap图片轮播

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