<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="../js/缓动(回调).js"></script>
<style>
* {
margin: 0;
padding: 0;
list-style: none;
}
.all {
width: 400px;
height: 225px;
/* border: 1px solid red; */
position: relative;
top: 150px;
left: 400px;
overflow: hidden;
}
ul {
width: 400%;
height: 200px;
background-color: antiquewhite;
position: absolute;
top: 0px;
left: 0px;
z-index: 1;
}
img {
width: 400px;
float: left;
}
button {
height: 100px;
width: 80px;
z-index: 2;
position: relative;
opacity: .3;
}
.b-left {
top: 63px;
display: none;
}
.b-right {
top: -30px;
left: 320px;
display: none;
}
.yuan {
height: 50px;
/* background-color: aqua; */
width: 300px;
position: absolute;
top: 190px;
left: 50px;
text-align: center;
line-height: 50px;
z-index: 2;
display: flex;
justify-content: center;
flex-direction: row;
align-items: center;
}
.yuan div {
height: 10px;
width: 10px;
border-radius: 50%;
background-color: rgba(273, 273, 283, .8);
margin-left: 5px;
cursor: pointer;
}
.yuan .red {
background-color: red;
}
</style>
</head>
<body>
<!-- <div class="red"></div> -->
<div class="all">
<button class="b-left"><</button>
<button class="b-right">></button>
<ul>
<li><img src="../img/1.png" alt=""></li>
<li><img src="../img/2.jpg" alt=""></li>
<li><img src="../img/4.jpg" alt=""></li>
<li><img src="../img/3.jpg" alt=""></li>
<!-- <li><img src="../img/1.png" alt=""></li> -->
<li><img src="../img/1.png" alt=""></li>
</ul>
<div class="yuan">
</div>
</div>
<script>
let all = document.querySelector(".all")
let ul = document.querySelector("ul")
let li = document.querySelectorAll("li")
let bl = document.querySelector(".b-left")
let br = document.querySelector(".b-right")
let yuan = document.querySelector(".yuan")
// 引入元素
let num = 0
// 图片的位置
let yd = 0
// 小圆点的位置
ul.style.width = li.length * 400 + "px"
// 设置ul宽度，随图片多少而变化
all.addEventListener("mouseenter", function () {
// 鼠标经过事件
bl.style.display = "block"
br.style.display = "block"
// 左右按钮显示
clearInterval(auto)
// 清除定时器
auto = null
})
all.addEventListener("mouseleave", function () {
// 鼠标离开事件
bl.style.display = "none"
br.style.display = "none"
// 左右按钮隐藏
auto = setInterval(function () {
br.click()
}, 2000)
// 调用定时器
})
br.addEventListener("click", function () {
if (num == li.length - 1) {
ul.style.left = 0 + "px"
num = 0
// 如果到最后一页，点击右按钮回到第一页，重置num
}
num++
animation(ul, -400 * num)
// 调用缓动函数
yd++
if (yd == li.length - 1) {
yd = 0
// 如果小圆点到最后，则点击调回第一张
}
yuanmove()
// 调用圆点移动函数
})
bl.addEventListener("click", function () {
// 左按钮点击事件
if (num == 0) {
num = li.length - 1
ul.style.left = -num * 400 + "px"
// 如果在第一张，点击左按钮则跳转最后一张
}
num--
animation(ul, -400 * num)
// 调用缓动函数
yd--
yd = yd < 0 ? yuan.children.length - 1 : yd
// 若小圆点位置为负数则变为最后一张位置
yuanmove()
})
for (i = 0; i < li.length - 1; i++) {
let div = document.createElement("div")
// 创建div在yuan内
div.setAttribute("index", i)
// 给div编写编号
yuan.appendChild(div)
// 将div加入yuan中
yuan.children[0].className = "red"
// 默认第一个圆点为红色
div.addEventListener("click", function () {
// 圆点点击事件
for (j = 0; j < li.length - 1; j++) {
yuan.children[j].className = " "
// 循环清除圆点样式
}
this.className = "red"
// 点击的圆点赋予属性
let index = this.getAttribute("index")
// 获取index
num = index
// index赋予num
yd = index
// index赋予yd
animation(ul, -index * 400)
// 调用缓动
})
}
function yuanmove() {
// 圆点移动函数
for (i = 0; i < yuan.children.length; i++) {
yuan.children[i].className = ""
// 遍历清空样式
}
yuan.children[yd].className = "red"
// 当前赋予样式
}
let auto = setInterval(function () {
// 自动播放定时器
br.click()
// 自动点击右按钮
}, 2000)
</script>
</body>
</html> 