js实现无缝轮播图
编程学习 2021-07-04 15:02www.dzhlxh.cn编程入门
这篇文章主要为大家详细介绍了js实现无缝轮播图，文中示例代码介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们可以参考一下
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="img/1.jpg" > <img src="img/2.jpg" > <img src="img/3.jpg" > <img src="img/4.jpg" > <img src="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" id="left" value="<" /> <input type="button" id="right" 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];
}
}
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