仿小米官网轮播图(Banner)的实现（代码教程）
程序员文章站
2022-04-23 19:27:33
本篇是仿照小米官网所做的轮播图，注意事项（图片命名规则为 banner-img-0.jpg，banner-img-1.jpg 依此类推）；
实例代码如下：
本篇是仿照小米官网所做的轮播图，注意事项（图片命名规则为 banner-img-0.jpg，banner-img-1.jpg 依此类推）；
实例代码如下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style type="text/css">
#banner{
margin: 100px auto;
position: relative;
width: 813px;
height: 320px;
}
#banner>img{
height: 100%;
width: 100%;
cursor: pointer;
}
#banner>p{
position: absolute;
bottom: 20px;
right: 20px;
}
#banner>p>span{
display: block;
width: 10px;
height: 10px;
float: left;
border: #333333 solid 2px;
border-radius: 50%;
background-color: #717987;
margin-left: 10px;
cursor: pointer;
}
#banner>p>span:first-child{
background-color: white;
}
</style>
</head>
<body>
<p id="banner">
<img src="img/banner-img-0.jpg"/>
<p>
<span></span>
<span></span>
<span></span>
<span></span>
<span></span>
</p>
</p>
<script type="text/javascript" src="js/jquery-1.12.3.js" ></script>
<script type="text/javascript">
let $bannerImg = $("#banner").children("img");
let $bannerPoints = $("#banner>p");
let prePoint = 0;//记录上一个被点击的小点
$bannerPoints.delegate("span", "click mouseenter", function () {
clearInterval(bannerInterval);//每次点击时，先停止轮播
let $2 = $(this);
if (prePoint !== $2.index()) { //防止鼠标移入时 用户点击了 重复两次走相同的逻辑赋值
currentPoint = $2.index();//赋值-- 关联到图片的循环设置
$2.css("background-color", "white").parent().children(":eq(" + prePoint + ")").css("background-color", "#717987");
$bannerImg.attr("src", "img/banner-img-" + $2.index() + ".jpg");
prePoint = $2.index(); //记录上一个点击的小点
}
});
$bannerPoints.delegate("span", "mouseleave", function () { //鼠标离开时 继续轮播
startBannerInterval();
});
let bannerInterval;
let currentPoint = 0;
let pointSize = $bannerPoints.children().length - 1;//用来重置小点的判断
function startBannerInterval() {
let children = $bannerPoints.find("span");
bannerInterval = setInterval(function () {
children.eq(prePoint).css("background-color", "#717987");
prePoint = currentPoint; //赋值-- 关联到图片的循环设置
if (currentPoint > pointSize) {
currentPoint = 0;
prePoint = 0;
}
children.eq(currentPoint).css("background-color", "white");
$bannerImg.attr("src", "img/banner-img-" + currentPoint + ".jpg");
currentPoint++;
}, 2000);
}
startBannerInterval();//开始轮播
</script>
</body>
</html>