JavaScript实现轮播特效
JavaScript实现轮播特效
1.封装一个getElementById()方法
//封装一个代替getElementById()的方法
function byId(id) {
return typeof(id) === "string"?document.getElementById(id):id;
}
2.定时器设置
——当鼠标没有在中心内容上，图片定时器开始启用，每个三秒执行一次切换图片
main.onmouseout = function () {
//setTimeout超时定时器
//setInterval定时调用
timer = setInterval(function () {
index++;
if(index>=len){
index = 0;
}
//切换图片
changeImg();
}, 3000);
}
——
function changeImg() {
//不管元素上有没有类，className属性设置的类会重写元素上的类
//遍历banner下多有的div及dots下所有的span，将其隐藏，将span清空类
for (var i = 0; i < len ; i++) {
pics[i].style.display = 'none';
dots[i].className = "";
}
//根据index索引找到当前div和当前span，将其显示出来和设为当前
pics[index].style.display = 'block';
dots[index].className = 'active';
}
3.图片自动轮播
4.图片的自动轮播和停止
5.点击圆点切换图片（圆点和index的绑定）
6.点击圆点切换图片（圆点和图片的绑定）
7.点击按钮切换图片
8.导航菜单的内容和样式
9.导航菜单的展开和收起
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link rel="stylesheet" href="../css/style.css">
</head>
<body>
<div class="main" id="main">
<div class="menu-box"></div>
<!--子菜单-->
<div class="sub-menu hide" id="sub-menu">
<!--手机-->
<div class="inner-box">
<div class="sub-inner-box">
<div class="title">手机、配件</div>
<div class="sub-row">
<span class="bold mr10">手机通讯：</span>
<a href="#">手机</a>
<span class="mr10 ml10">/</span>
<a href="#">手机维修</a>
<span class="mr10 ml10">/</span>
<a href="#">以旧换新</a>
</div>
<div class="sub-row">
<span class="bold mr10">手机配件：</span>
<a href="#">手机壳</a>
<span class="mr10 ml10">/</span>
<a href="#">手机存储卡</a>
<span class="mr10 ml10">/</span>
<a href="#">数据线</a>
<span class="mr10 ml10">/</span>
<a href="#">充电器</a>
<span class="mr10 ml10">/</span>
<a href="#">电池</a>
</div>
<div class="sub-row">
<span class="bold mr10">运营商：</span>
<a href="#">中国联通</a>
<span class="mr10 ml10">/</span>
<a href="#">中国移动</a>
<span class="mr10 ml10">/</span>
<a href="#">中国电信</a>
</div>
<div class="sub-row">
<span class="bold mr10">智能设备：</span>
<a href="#">智能手环</a>
<span class="mr10 ml10">/</span>
<a href="#">智能家居</a>
<span class="mr10 ml10">/</span>
<a href="#">智能手表</a>
<span class="mr10 ml10">/</span>
<a href="#">其他配件</a>
</div>
<div class="sub-row">
<span class="bold mr10">娱乐：</span>
<a href="#">耳机</a>
<span class="mr10 ml10">/</span>
<a href="#">音响</a>
<span class="mr10 ml10">/</span>
<a href="#">收音机</a>
<span class="mr10 ml10">/</span>
<a href="#">麦克风</a>
</div>
</div>
</div>
<!--电脑-->
<div class="inner-box">
<div class="sub-inner-box">
<div class="title">电脑</div>
<div class="sub-row">
<span class="bold mr10">电脑通讯：</span>
<a href="#">手机</a>
<span class="mr10 ml10">/</span>
<a href="#">手机维修</a>
<span class="mr10 ml10">/</span>
<a href="#">以旧换新</a>
</div>
<div class="sub-row">
<span class="bold mr10">手机配件：</span>
<a href="#">手机壳</a>
<span class="mr10 ml10">/</span>
<a href="#">手机存储卡</a>
<span class="mr10 ml10">/</span>
<a href="#">数据线</a>
<span class="mr10 ml10">/</span>
<a href="#">充电器</a>
<span class="mr10 ml10">/</span>
<a href="#">电池</a>
</div>
<div class="sub-row">
<span class="bold mr10">运营商：</span>
<a href="#">中国联通</a>
<span class="mr10 ml10">/</span>
<a href="#">中国移动</a>
<span class="mr10 ml10">/</span>
<a href="#">中国电信</a>
</div>
<div class="sub-row">
<span class="bold mr10">智能设备：</span>
<a href="#">智能手环</a>
<span class="mr10 ml10">/</span>
<a href="#">智能家居</a>
<span class="mr10 ml10">/</span>
<a href="#">智能手表</a>
<span class="mr10 ml10">/</span>
<a href="#">其他配件</a>
</div>
<div class="sub-row">
<span class="bold mr10">娱乐：</span>
<a href="#">耳机</a>
<span class="mr10 ml10">/</span>
<a href="#">音响</a>
<span class="mr10 ml10">/</span>
<a href="#">收音机</a>
<span class="mr10 ml10">/</span>
<a href="#">麦克风</a>
</div>
</div>
</div>
<!--家用电器-->
<div class="inner-box">
<div class="sub-inner-box">
<div class="title">家用电器</div>
<div class="sub-row">
<span class="bold mr10">手机通讯：</span>
<a href="#">手机</a>
<span class="mr10 ml10">/</span>
<a href="#">手机维修</a>
<span class="mr10 ml10">/</span>
<a href="#">以旧换新</a>
</div>
<div class="sub-row">
<span class="bold mr10">手机配件：</span>
<a href="#">手机壳</a>
<span class="mr10 ml10">/</span>
<a href="#">手机存储卡</a>
<span class="mr10 ml10">/</span>
<a href="#">数据线</a>
<span class="mr10 ml10">/</span>
<a href="#">充电器</a>
<span class="mr10 ml10">/</span>
<a href="#">电池</a>
</div>
<div class="sub-row">
<span class="bold mr10">运营商：</span>
<a href="#">中国联通</a>
<span class="mr10 ml10">/</span>
<a href="#">中国移动</a>
<span class="mr10 ml10">/</span>
<a href="#">中国电信</a>
</div>
<div class="sub-row">
<span class="bold mr10">智能设备：</span>
<a href="#">智能手环</a>
<span class="mr10 ml10">/</span>
<a href="#">智能家居</a>
<span class="mr10 ml10">/</span>
<a href="#">智能手表</a>
<span class="mr10 ml10">/</span>
<a href="#">其他配件</a>
</div>
<div class="sub-row">
<span class="bold mr10">娱乐：</span>
<a href="#">耳机</a>
<span class="mr10 ml10">/</span>
<a href="#">音响</a>
<span class="mr10 ml10">/</span>
<a href="#">收音机</a>
<span class="mr10 ml10">/</span>
<a href="#">麦克风</a>
</div>
</div>
</div>
<!--家具-->
<div class="inner-box">
<div class="sub-inner-box">
<div class="title">家具</div>
<div class="sub-row">
<span class="bold mr10">手机通讯：</span>
<a href="#">手机</a>
<span class="mr10 ml10">/</span>
<a href="#">手机维修</a>
<span class="mr10 ml10">/</span>
<a href="#">以旧换新</a>
</div>
<div class="sub-row">
<span class="bold mr10">手机配件：</span>
<a href="#">手机壳</a>
<span class="mr10 ml10">/</span>
<a href="#">手机存储卡</a>
<span class="mr10 ml10">/</span>
<a href="#">数据线</a>
<span class="mr10 ml10">/</span>
<a href="#">充电器</a>
<span class="mr10 ml10">/</span>
<a href="#">电池</a>
</div>
<div class="sub-row">
<span class="bold mr10">运营商：</span>
<a href="#">中国联通</a>
<span class="mr10 ml10">/</span>
<a href="#">中国移动</a>
<span class="mr10 ml10">/</span>
<a href="#">中国电信</a>
</div>
<div class="sub-row">
<span class="bold mr10">智能设备：</span>
<a href="#">智能手环</a>
<span class="mr10 ml10">/</span>
<a href="#">智能家居</a>
<span class="mr10 ml10">/</span>
<a href="#">智能手表</a>
<span class="mr10 ml10">/</span>
<a href="#">其他配件</a>
</div>
<div class="sub-row">
<span class="bold mr10">娱乐：</span>
<a href="#">耳机</a>
<span class="mr10 ml10">/</span>
<a href="#">音响</a>
<span class="mr10 ml10">/</span>
<a href="#">收音机</a>
<span class="mr10 ml10">/</span>
<a href="#">麦克风</a>
</div>
</div>
</div>
</div>
<!--主菜单-->
<div class="menu-content" id="menu-content">
<div class="menu-item">
<a href="">
<span>手机、配件</span>
<i></i>
</a>
</div>
<div class="menu-item">
<a href="">
<span>电脑</span>
<i></i>
</a>
</div>
<div class="menu-item">
<a href="">
<span>家用电器</span>
<i></i>
</a>
</div>
<div class="menu-item">
<a href="">
<span>家具</span>
<i></i>
</a>
</div>
</div>
<!--图片轮播-->
<div class="banner" id="banner">
<a href="">
<div class="banner_slide slide1 slide-active"></div>
</a>
<a href="">
<div class="banner_slide slide2"></div>
</a>
<a href="">
<div class="banner_slide slide3"></div>
</a>
</div>
<!--上一张、下一张按钮-->
<a href="javascript:void(0)" class="button prev" id="prev"></a>
<a href="javascript:void(0)" class="button next" id="next"></a>
<!--圆点按钮-->
<div class="dots" id="dots">
<span class="active"></span>
<span></span>
<span></span>
</div>
</div>
<script src="../js/js.js"></script>
</body>
</html>
*{
margin: 0px;
padding: 0px;
}
@font-face {
font-family: "iconfont";
src:url("../img/font/iconfont.eot");
src:url("../img/font/iconfont.eot") format("embedded-opentype"),
url("../img/font/iconfont.woff") format("woff"),
url("../img/font/iconfont.ttf") format("truetype"),
url("../img/font/iconfont.svg#iconfog") format("svg");
}
a:link,a:visited{
color: #5e5e5e;
}
a{
text-decoration: none;
}
body{
font-family: 微软雅黑;
color: #14191e;
}
.main{
width: 1200px;
height: 460px;
margin: 30px auto;
overflow: hidden;
position: relative;
}
.banner{
width: 1200px;
height: 460px;
position: relative;
overflow: hidden;
}
.banner_slide{
width: 1200px;
height: 460px;
background-repeat: no-repeat;
display: none;
float: left;
}
.slide1{
background-image: url("../img/bg1.jpg");
}
.slide2{
background-image: url("../img/bg2.jpg");
}
.slide3{
background-image: url("../img/bg3.jpg");
}
.slide-active{
display: block;
}
.button{
position: absolute;
width: 40px;
height: 80px;
left: 244px;
top: 50%;
margin-top: -40px;
background: url("../img/arrow.png") no-repeat center center;
}
.prev{
transform:rotate(180deg);
}
.button:hover{
background-color: #333;
opacity: 0.4;
/*兼容其他浏览器*/
filter: alpha(opacity=80);
}
.next{
left: auto;
/*如果left和right同时出现，谁先出现采用谁，另一个无效，要想使它有效*/
/*将有效的那个设置为auto*/
right: 0;
}
.dots{
position: absolute;
right: 20px;
bottom: 24px;
text-align: center;
}
.dots span{
/*排布方式在一条线上*/
display: inline-block;
width: 12px;
height: 12px;
border-radius: 50%;
background:rgba(7,17,27,0.4);
/*c3新增属性
水平方向 垂直方向 阴影的距离 模糊程度 阴影的颜色 阴影设置为内置的使圆点变小*/
box-shadow: 0 0 0 2px rgba(255,255,255,0.8) inset;
margin-left: 8px;
/*光标呈现为指示链接的指针（一只手）*/
cursor: pointer;
}
.dots span.active{
box-shadow: 0 0 0 2px rgba(7,17,27,0.4) inset;
background-color: #fff;
}
.menu-box{
width: 244px;
height: 460px;
position: absolute;
left: 0;
top: 0;
background: rgba(7,17,27,0.5);
z-index: 1;
opacity: 0.5;
}
.menu-content{
width: 244px;
height: 454px;
position: absolute;
left: 0;
top: 0;
z-index: 2;
padding-top: 6px;
}
.menu-item{
height: 64px;
line-height: 66px;
font-size: 16px;
padding: 0 24px;
position: relative;
}
.menu-item a:link,.menu-item a:visited{
color: #fff;
}
.menu-item a{
display: block;
border-bottom: 1px solid rgba(255,255,255,0.2);
padding: 0 8px;
height: 63px;
}
.menu-item i{
font-family: iconfont;
position: absolute;
top: 2px;
right: 32px;
font-size: 24px;
font-style: normal;
font-weight: normal;
color: rgba(255,255,255,0.5);
}
.sub-menu{
width: 730px;
height: 458px;
border: 1px solid #d9dde1;
background: #fff;
position: absolute;
left: 244px;
top: 0;
z-index: 999;
box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}
.inner-box{
width: 100%;
height: 100%;
background: url("../img/fe.png") no-repeat;
display: none;
}
.sub-inner-box{
width: 652px;
margin-left: 40px;
overflow: hidden;
}
.title{
color: #f01414;
font-size: 16px;
line-height: 16px;
margin: 28px 0 30px 0;
font-weight: bold;
}
.sub-row{
margin-bottom: 25px;
}
.bold{
font-weight: bold;
}
.mr10{
margin-right: 10px;
}
.ml10{
margin-left: 10px;
}
.hide{
display: none;
}
//封装一个代替getElementById()的方法
function byId(id) {
return typeof(id) === "string"?document.getElementById(id):id;
}
//全局变量
var index = 0,
timer = null,
pics = byId("banner").getElementsByTagName("div"),
len = pics.length,
dots = byId("dots").getElementsByTagName("span"),
prev = byId("prev"),
next = byId("next"),
menu = byId("menu-content"),
subMenu = byId("sub-menu"),
innerBox = subMenu.getElementsByClassName("inner-box"),
menuItems = menu.getElementsByClassName("menu-item");
function slideImg(){
var main = byId("main");
//鼠标滑过清除定时器，离开继续
main.onmouseover = function () {
//滑过清除定时器
if(timer) clearInterval(timer);
}
main.onmouseout = function () {
//setTimeout超时定时器
//setInterval定时调用
timer = setInterval(function () {
index++;
if(index>=len){
index = 0;
}
//切换图片
changeImg();
}, 3000);
}
//自动在main上触发鼠标离开的事件
main.onmouseout();
//点击圆点切换图片
for (var i = 0; i < len ; i++) {
//在JavaScript中function会改变作用域的，此时在function中的i是3
dots[i].id = i;
dots[i].onclick = function () {
index = this.id;
//调用changeImg，实现切换图片
changeImg();
}
}
//点击下一张图片
next.onclick = function () {
index++;
if (index>=len) index = 0;
changeImg();
}
//点击上一张图片
prev.onclick = function () {
index--;
if (index<0) index = 2;
changeImg();
}
//导航菜单
//遍历主菜单，且绑定事件，
for (var m = 0; m < menuItems.length ; m++) {
//给每一个menu-item定义data-index属性，作为索引
menuItems[m].setAttribute("data-index",m);
menuItems[m].onmouseover = function () {
subMenu.className = "sub-menu";
var idx = this.getAttribute("data-index");
//遍历所有子菜单，将每一个都隐藏
for (var i = 0; i < innerBox.length ; i++) {
innerBox[i].style.display = 'none';
menuItems[i].style.background = 'none';
}
menuItems[idx].style.background = 'rgba(0,0,0,0.1)';
innerBox[idx].style.display = 'block';
}
}
menu.onmouseout = function () {
subMenu.className = "sub-menu hide";
}
subMenu.onmouseover = function () {
this.className = "sub-menu";
}
subMenu.onmouseout = function () {
this.className = "sub-menu hide"
}
}
function changeImg() {
//不管元素上有没有类，className属性设置的类会重写元素上的类
//遍历banner下多有的div及dots下所有的span，将其隐藏，将span清空类
for (var i = 0; i < len ; i++) {
pics[i].style.display = 'none';
dots[i].className = "";
}
//根据index索引找到当前div和当前span，将其显示出来和设为当前
pics[index].style.display = 'block';
dots[index].className = 'active';
}
slideImg();
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