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如何实现幻灯片效果/图片轮播

2017-03-25 22:44 435 查看

幻灯片效果/图片轮播通常用来循环显示某些元素，常使用在网站与app首页。例如本站首页所使用的图片轮播：

创建幻灯片特效

第一步：添加HTML

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>幻灯片特效/图片轮播演示</title>
<link rel="stylesheet" href="style.css">
</head>

<body>

<div class="slideshow-container">
<div class="mySlides fade">
<div class="numbertext">1 / 3</div>
<img src="img1.jpg" style="width:100%">
<div class="text">幻灯片1</div>
</div>

<div class="mySlides fade">
<div class="numbertext">2 / 3</div>
<img src="img2.jpg" style="width:100%">
<div class="text">幻灯片2</div>
</div>

<div class="mySlides fade">
<div class="numbertext">3 / 3</div>
<img src="img3.jpg" style="width:100%">
<div class="text">幻灯片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>

<!-- js文件最后加载，提高页面呈现速度 -->
<script src="carousel.js"></script>

</body>
</html>

第二步：添加CSS（style.css）

@charset "utf-8";
* {box-sizing:border-box}

/* 幻灯片容器 */
.slideshow-container {
max-width: 1000px;
position: relative;
margin: auto;
}

.mySlides {
display: none;
}

/* 向前向后按钮 */
.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;
}

/* 向后按钮置于右边 */
.next {
right: 0;
border-radius: 3px 0 0 3px;
}

/* 鼠标滑过按钮，添加黑色背景 */
.prev:hover, .next:hover {
background-color: rgba(0,0,0,0.8);
}

/* 图片说明文字 */
.text {
color: #f2f2f2;
font-size: 15px;
padding: 8px 12px;
position: absolute;
bottom: 8px;
width: 100%;
text-align: center;
}

/* 数字 (1/3 等) */
.numbertext {
color: #f2f2f2;
font-size: 12px;
padding: 8px 12px;
position: absolute;
top: 0;
}

/* 下方指示器 */
.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;
}

/* 渐隐动画 */
.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}
}

第三步：添加js（carousel.js）

var slideIndex = 1;
showSlides(slideIndex);

function plusSlides(n) {
showSlides(slideIndex += n);
}

function currentSlide(n) {
showSlides(slideIndex = n);
}

function showSlides(n) {
var i;
var slides = document.getElementsByClassName("mySlides");
var dots = document.getElementsByClassName("dot");
if (n > slides.length) {
slideIndex = 1
}
if (n < 1) {
slideIndex = slides.length
}
for (i = 0; i < slides.length; i++) {
slides[i].style.display = "none";
}
for (i = 0; i < dots.length; i++) {
dots[i].className = dots[i].className.replace(" active", "");
}
slides[slideIndex-1].style.display = "block";
dots[slideIndex-1].className += " active";
}

如果改为自动播放幻灯片，则使用如下js：

var slideIndex = 0;
showSlides();

function showSlides() {
var i;
var slides = document.getElementsByClassName("mySlides");
for (i = 0; i < slides.length; i++) {
slides[i].style.display = "none";
}
slideIndex++;
if (slideIndex> slides.length) {slideIndex = 1}
slides[slideIndex-1].style.display = "block";
setTimeout(showSlides, 2000); // Change image every 2 seconds
}

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标签： 图片轮播幻灯片特效

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