js 轮播图效果
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2022-04-29 20:33:37
轮播图是网站中常见的效果，如淘宝，京东的商品轮播。 ......
<!doctype html>
<html>
<head lang="en">
<meta charset="utf-8">
<title></title>
</head>
<style>
* {box-sizing:border-box}
body {font-family: verdana,sans-serif;}
.myslides {display:none}
/* 幻灯片容器 */
.slideshow-container {
max-width: 1000px;
position: relative;
margin: auto;
}
/* 下一张 & 上一张 按钮 */
.prev, .next {
cursor: pointer;
position: absolute;
top: 50%;
width: auto;
margin-top: -22px;
padding: 16px;
color: white;
font-weight: bold;
font-size: 18px;
transition: 0.6s ease;
border-radius: 0 3px 3px 0;
}
/* 定位 "下一张" 按钮靠右 */
.next {
right: 0;
border-radius: 3px 0 0 3px;
}
/* on hover, add a black background color with a little bit see-through */
.prev:hover, .next:hover {
background-color: rgba(0,0,0,0.8);
}
/* 标题文本 */
.text {
color: #f2f2f2;
font-size: 15px;
padding: 8px 12px;
position: absolute;
bottom: 8px;
width: 100%;
text-align: center;
}
/* 数字文本 (1/3 等) */
.numbertext {
color: #f2f2f2;
font-size: 12px;
padding: 8px 12px;
position: absolute;
top: 0;
}
/* 标记符号 */
.dot {
cursor:pointer;
height: 13px;
width: 13px;
margin: 0 2px;
background-color: #bbb;
border-radius: 50%;
display: inline-block;
transition: background-color 0.6s ease;
}
.active, .dot:hover {
background-color: #717171;
}
/* 淡出动画 */
.fade {
-webkit-animation-name: fade;
-webkit-animation-duration: 1.5s;
animation-name: fade;
animation-duration: 1.5s;
}
@-webkit-keyframes fade {
from {opacity: .4}
to {opacity: 1}
}
@keyframes fade {
from {opacity: .4}
to {opacity: 1}
}
</style>
<body>
<div class="slideshow-container">
<div class="myslides fade">
<div class="numbertext">1 / 3</div>
<img src="https://c.runoob.com/wp-content/uploads/2017/01/img_mountains_wide.jpg" style="width:100%">
<div class="text">文本 1</div>
</div>
<div class="myslides fade">
<div class="numbertext">2 / 3</div>
<img src="https://c.runoob.com/wp-content/uploads/2017/01/img_fjords_wide.jpg" style="width:100%">
<div class="text">文本 2</div>
</div>
<div class="myslides fade">
<div class="numbertext">3 / 3</div>
<img src="https://c.runoob.com/wp-content/uploads/2017/01/img_nature_wide.jpg" style="width:100%">
<div class="text">文本 3</div>
</div>
<a class="prev" onclick="plusslides(-1)">❮</a>
<a class="next" onclick="plusslides(1)">❯</a>
</div>
<br>
<div style="text-align:center">
<span class="dot" onclick="currentslide(1)"></span>
<span class="dot" onclick="currentslide(2)"></span>
<span class="dot" onclick="currentslide(3)"></span>
</div>
</body>
</html>
<script>
var slideindex = 1;
showslides(slideindex);
// $(function(){
// showslides(1);
// });
function plusslides(n) {
showslides(slideindex += n);
}
//小圆点 属性：onclick
function currentslide(n) {
showslides(slideindex = n);
}
function showslides(n) {
// alert('zhixing');
var i;
var slides = document.getelementsbyclassname("myslides");
var dots = document.getelementsbyclassname("dot");
if (n > slides.length) {slideindex = 1}
if (n < 1) {slideindex = slides.length}
//全部隐藏
for (i = 0; i < slides.length; i++) {
slides[i].style.display = "none";
}
//全部小圆点取消高亮
for (i = 0; i < dots.length; i++) {
dots[i].classname = dots[i].classname.replace(" active", "");
}
//对应的div显示+对应的小圆点高亮
slides[slideindex-1].style.display = "block";
dots[slideindex-1].classname += " active";
}
</script>
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