<!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>轮播图</title>
<style>
/* ! 3. 轮播图 */
.slider {
max-width: 750px;
min-width: 320px;
margin: auto;
padding: 0 10px;
}
.slider .imgs {
/* 图片容器必须要有高度,否则下面图片不能正常显示 */
height: 150px;
}
.slider .imgs img {
/* 图片完全充满父级空间显示 */
height: 100%;
width: 100%;
/* 图片带有圆角 */
border-radius: 10px;
/* 默认图片全部隐藏,只有有active的图片才显示 */
display: none;
}
.slider .imgs img:hover {
cursor: pointer;
}
/* 默认显示第一张 */
.slider .imgs img.active {
display: block;
}
/* 轮播图按钮组 */
.slider .btns {
/* 按钮水平一排显示,用flex,且水平居中 */
display: flex;
place-content: center;
}
.slider .btns span {
/* 按钮宽高相同,确定显示成一个正圆 */
width: 8px;
height: 8px;
/* 加上红色背景和数字是为了布局时可以看到,一会更去掉 */
background-color: rgba(255, 255, 255, 0.4);
/* 50%可确保显示为正圆 */
border-radius: 50%;
/* 按钮上外边距负值,可将它上移,可移动到图片中下方 */
margin: -12px 3px 5px;
}
.slider .btns span.active {
background-color: #fff;
}
.slider .page {
display: flex;
place-content: space-between;
margin-top: -88px;
opacity: 0.3;
}
.slider .page button {
border: none;
}
</style>
<link
rel="stylesheet"
href="//at.alicdn.com/t/font_3280335_j9wms97sque.css"
/>
</head>
<body>
<div class="slider">
<div class="imgs">
<img src="images/1.jpg" alt="" data-index="1" class="active" />
<img src="images/2.jpg" alt="" data-index="2" />
<img src="images/3.jpg" alt="" data-index="3" />
<img src="images/4.jpg" alt="" data-index="4" />
<img src="images/5.jpg" alt="" data-index="5" />
</div>
<div class="btns">
<span data-index="1" class="active" onclick="setActive()"></span>
<span data-index="2" onclick="setActive()"></span>
<span data-index="3" onclick="setActive()"></span>
<span data-index="4" onclick="setActive()"></span>
<span data-index="5" onclick="setActive()"></span>
</div>
<div class="page">
<button class="prev" onclick="setPage(1)">
<i class="iconfont icon-shangyige"></i>
</button>
<button class="next" onclick="setPage(2)">
<i class="iconfont icon-xiayige"></i>
</button>
</div>
</div>
<script>
const imgs = document.querySelectorAll(".slider .imgs img");
const btns = document.querySelectorAll(".slider .btns span");
let iNow = 0;
//清空class
function claerClass() {
imgs.forEach((img) => img.classList.remove("active"));
btns.forEach((btn) => btn.classList.remove("active"));
}
//添加样式:翻页、自动播放、点击btn按钮
function setActive(iNow) {
//调用清空class自定义函数
claerClass();
//if判断iNow !== undefined :翻页、自动播放;else:点击btn按钮
if (iNow !== undefined) {
[...imgs].filter((img, index) => {
if (iNow === index) {
img.classList.add("active");
}
});
[...btns].filter((btn, index) => {
if (iNow === index) {
btn.classList.add("active");
}
});
} else {
event.target.classList.add("active");
imgs.forEach((img) => {
if (img.dataset.index === event.target.dataset.index) {
img.classList.add("active");
}
});
}
}
//自动播放函数
function setInteCanshu() {
iNow++;
if (iNow == btns.length) iNow = 0;
setActive(iNow);
}
//设置翻页
function setPage(ele) {
// ele :1 上一页 2 下一页
if (ele === 2) {
iNow++;
if (iNow == imgs.length) iNow = 0;
setActive(iNow);
} else {
iNow--;
if (iNow == -1) iNow = imgs.length - 1;
setActive(iNow);
}
}
//间隔2秒执行一次自动函数
let setInte = setInterval(setInteCanshu, 2000);
//获取整个div
let slider = document.querySelector(".slider");
//鼠标悬停时自动停止播放
slider.onmouseover = () => clearInterval(setInte);
//离开时又自动播放
slider.onmouseout = () => (setInte = setInterval(setInteCanshu, 2000));
</script>
</body>
</html>
<script>
let url = "";
//ajax:xhr
function getUser() {
//创建对象
const xhr = new XMLHttpRequest();
//请求类型
xhr.response("json");
//配置参数
xhr.open("GET", url);
//请求成功
xhr.onload = () => {
console.log(xhr.response);
};
//请求失败
xhr.onerror = () => {
console.log("请求失败");
};
//发起请求
xhr.send(null);
}
</script>
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