html部分
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>轮播</title>
<link rel="stylesheet" type="text/css" href="style.css"/>
<script type="text/javascript" src="jq2.0.js"></script>
<script type="text/javascript" src="banner.js"></script>
</head>
<body>
<!-- 轮播 -->
<div class="banner" id="J_bg_ban">
<ul>
<li><a href="#"><img src="https://zsqosos.github.io/component_library/img/banner_01.jpg" alt="广告图"/></a></li>
<li><a href="#"><img src="https://zsqosos.github.io/component_library/img/banner_02.jpg" alt="广告图"/></a></li>
<li><a href="#"><img src="https://zsqosos.github.io/component_library/img/banner_03.jpg" alt="广告图"/></a></li>
<li><a href="#"><img src="https://zsqosos.github.io/component_library/img/banner_04.jpg" alt="广告图"/></a></li>
<li><a href="#"><img src="https://zsqosos.github.io/component_library/img/banner_05.jpg" alt="广告图"/></a></li>
</ul>
<div class="indicator" id="J_bg_indicator"></div>
<div class="ban-btn clearfloat" id="J_bg_btn">
<a class="next-btn fr" href="javascript:">></a><a class="prev-btn fl" href="javascript:"><</a>
</div>
<script type="text/javascript">
$(document).ready(function(){
var banner1 = new Carousel('#J_bg_ban', '#J_bg_indicator', '#J_bg_btn');
})
</script>
</body>
</html>
js部分
// 构造函数加原型形式
/**
* 构造函数初始化及开始轮播
* @param bannnerBox string 包含整个轮播图盒子的id或class
* @param aBox string 包含指示器的盒子的id或class
* @param btnBox string 包含前后按钮的盒子的id或class
*/
function Carousel(bannnerBox, aBox, btnBox) {
this.now = 0; //当前显示的图片索引
this.hasStarted = false; //是否开始轮播
this.interval = null; //定时器
this.liItems = null; //要轮播的li元素集合
this.len = 0; //liItems的长度
this.bannnerBox = null; //包含指示器的dom对象
this.aBox = null; //包含指示器的dom对象
this.bBox = null; //包含前后按钮的dom对象
//初始化函数
this.init = function () {
//初始化对象参数
var that = this;
this.liItems = $(bannnerBox).find('ul').find('li');
this.len = this.liItems.length;
this.aBox = $(bannnerBox).find(aBox);
this.bBox = $(bannnerBox).find(btnBox);
//让第一张图片显示,根据轮播图数量动态创建指示器,并让第一个指示器处于激活状态,隐藏前后按钮
this.liItems.first('li').css({
'opacity': 1,
'z-index': 1
}).siblings('li').css({
'opacity': 0,
'z-index': 0
});
var aDom = '';
for (var i = 0; i < this.len; i++) {
aDom += '<a></a>';
}
$(aDom).appendTo(this.aBox);
this.aBox.find('a:first').addClass("indicator-active");
this.bBox.hide();
//鼠标移入banner图时,停止轮播并显示前后按钮,移出时开始轮播并隐藏前后按钮
$(bannnerBox).hover(function () {
that.stop();
that.bBox.fadeIn(200);
}, function () {
that.start();
that.bBox.fadeOut(200);
});
//鼠标移入指示器时,显示对应图片,移出时继续播放
this.aBox.find('a').hover(function () {
that.stop();
var out = that.aBox.find('a').filter('.indicator-active').index();
that.now = $(this).index();
if (out != that.now) {
that.play(out, that.now)
}
}, function () {
that.start();
});
//点击左右按钮时显示上一张或下一张
$(btnBox).find('a:first').click(function () {
that.next()
});
$(btnBox).find('a:last').click(function () {
that.prev()
});
}
//初始化
this.init();
//开始轮播
this.start();
}
/**
* 播放函数
* @param out number 要消失的图片的索引值
* @param now number 接下来要轮播的图的索引值
*/
Carousel.prototype.play = function (out, now) {
this.liItems.eq(out).stop().animate({
opacity: 0,
'z-index': 0
}, 500).end().eq(now).stop().animate({
opacity: 1,
'z-index': 1
}, 500);
this.aBox.find('a').removeClass('indicator-active').eq(now).addClass('indicator-active');
}
//前一张函数
Carousel.prototype.prev = function () {
var out = this.now;
this.now = (--this.now + this.len) % this.len;
this.play(out, this.now)
}
//后一张函数
Carousel.prototype.next = function () {
var out = this.now;
this.now = ++this.now % this.len;
this.play(out, this.now);
}
//开始函数
Carousel.prototype.start = function () {
if (!this.hasStarted) {
this.hasStarted = true;
var that = this;
this.interval = setInterval(function () {
that.next();
}, 2000);
}
}
//停止函数
Carousel.prototype.stop = function () {
clearInterval(this.interval);
this.hasStarted = false;
}
// window.Carousel = Carousel;
css样式
.banner {
height: 325px;
width: 812px;
position: relative;
overflow: hidden;
}
.banner ul{
padding: 0;
margin: 0;
}
.banner ul li{
top: 0;
left: 0;
list-style: none;
position: absolute;
}
.banner ul li img{
height: 325px;
width: 812px;
display: block;
}
.ban-btn{
width: 100%;
position: absolute;
top: 136px;
z-index: 2;
}
.ban-btn a{
display: inline-block;
height: 60px;
width: 35px;
background: rgba(180,180,180,0.5);
font-size: 25px;
text-align: center;
line-height: 60px;
color: #fff;
text-decoration: none;
}
.next-btn{
float: right;
}
.prev-btn{
float: left;
}
.ban-btn a:hover{
background: rgba(100,100,100,0.5);
}
.indicator{
width: 100%;
position: absolute;
text-align: center;
bottom: 15px;
z-index: 2;
}
.indicator a{
display: inline-block;
width: 20px;
height: 5px;
margin:0 3px;
background: #fff;
}
.indicator-active{
background: #FF8C00!important;
}