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一、z-index透明度轮播
原理：将所有img元素重叠在一起，为想要展示的图片的z-index属性，设置为最大值。
Document
* {
margin: 0;
padding: 0;
}
div {
position: relative;
width: 500px;
height: 300px;
z-index: 10000;
}
div img {
position: absolute;
z-index: 10;
opacity: 0;
transition: all 0.5s ease;
}
div button {
width: 50px;
position: absolute;
z-index: 1000;
top: 150px;
cursor: pointer
}
#btnLeft {
left: 0;
}
#btnRignt {
right: 0;
}
.active {
z-index: 1000;
opacity: 1;
}
ul {
position: absolute;
padding: 0;
list-style: none;
z-index: 1000;
right: 20px;
bottom: 20px;
cursor: pointer;
}
li {
float: left;
width: 8px;
height: 8px;
background-color: rgba(0, 0, 0, 0.4);
border-radius: 100%;
margin-right: 10px;
border: 2px solid black;
}
.liwhite {
background-color: white
}
>
var btnLeft = document.getElementById('btnLeft')
var btnRignt = document.getElementById('btnRignt')
var item = document.getElementsByClassName('item')
var li = document.getElementsByTagName('li')
var div = document.getElementById('div')
var index = 0
//移除所有的active项
function removeClassActive() {
for (var i = 0; i = 4) {
index = -1
} else if (index
*{
margin: 0;
padding: 0;
}
div.content{
position: relative;
overflow: hidden;
width: 700px;
height: 400px;
border:1px solid beige;
background-color: aqua;
}
ul{
position: absolute;
list-style: none;
}
ul.top>li{
float: left;
width: 700px;
height: 400px;
}
img{
width: 100%;
height: 100%;
}
button.perv{
position: absolute;
top: 191px;
left:0;
}
button.next{
position: absolute;
top: 191px;
right:0;
}
ul.bottom{
position: absolute;
top: 336px;
left: 20px;
}
ul.bottom>li{
float: left;
width: 25px;
height: 25px;
margin-left:15px;
border: 1px solid #00FFFF;
text-align: center;
line-height: 25px;
cursor: pointer;
}
.red{
background-color: red;
}
function $(n){
return document.querySelector(n);
}
window.onload=function(){
var liIndex=1;
var liWidth,liLenth,lilen,timer,timer2;
go();
function go(){
//复制前后li
var copy_li1=$(".top>li:first-of-type").cloneNode(true);
$(".top").appendChild(copy_li1);
var copy_lilast=$(".top>li:nth-of-type(5)").cloneNode(true);
$(".top").insertBefore(copy_lilast,$(".top>li:first-of-type"));
//给ul宽度
liWidth=$(".top>li").clientWidth;
lilen=document.querySelectorAll(".top>li").length;
$(".top").style.width=lilen*liWidth+"px";
$(".top").style.left=-liWidth+"px";
//左右点击
$(".perv").onclick=function(){
prev(liIndex);
}
$(".next").onclick=function(){
next(liIndex);
}
//点击子弹
var bullets=document.querySelectorAll(".bottom>li");
for(var i=0;i0?Math.ceil(speed):Math.floor(speed);
$(".top").style.left=new_left+speed+"px";
},10);
console.log(liIndex);
}
}
perv
next
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