需要准备的材料分别有：电脑、浏览器、html编辑器。
1、首先，打开html编辑器，新建html文件，例如：index.html，编写问题基础代码。
2、在index.html中的<script>标签，输入js代码：
function fun() {
var a = Math.random() * 5
$('img').attr('src', 'image' + a + '.jpg')
}
3、浏览器运行index.html页面，此时点击图片会换一张图片。
1、首先输入代码：
<div class="wrapper">
<div id="focus">
<ul>
<li><a href="http://www.lanrentuku.com/" target="_blank"><img src="img/01.jpg" alt="QQ商城焦点图效果下载" /></a></li>
2、然后输入代码：
<li><a href="http://www.lanrentuku.com/" target="_blank"><img src="img/02.jpg" alt="QQ商城焦点图效果教程" /></a></li>
<li><a href="http://www.lanrentuku.com/" target="_blank"><img src="img/03.jpg" alt="jquery商城焦点图效果" /></a></li>
<li><a href="http://www.lanrentuku.com/" target="_blank"><img src="img/04.jpg" alt="jquery商城焦点图代码" /></a></li>
3、然后再输入代码：
<li><a href="http://www.lanrentuku.com/" target="_blank"><img src="img/05.jpg" alt="jquery商城焦点图源码" /></a></li>
</ul>
</div>
</div><!-- wrapper end -->
</body>
4、然后就完成了。
<!doctype html><html>
<head>
<meta charset="UTF-8">
<title>H5course</title>
<link rel="stylesheet" href="css/reset.css">
<style>
.imgview {
width: 255px
height: 402px
margin: 50px auto
border: 10px solid red
overflow: hidden
}
.imgview img {
width: 255px
height: 402px
}
.imgview-nav {
width: 255px
margin: 10px auto
border: 1px solid red
list-style-type: none
}
.imgview-nav li {
float: left
width: 15px
height: 15px
border: 1px solid blue
margin: 10px
}
span {
display: inline-block
width: 50px
height: 50px
background: #CFC
border-radius: 50%
}
</style>
</head>
<body>
<div class="wrap">
<div class="imgview" id="imgView">
<table cellspacing="0" cellpadding="0">
<tr>
<td><img src="img/1.jpg" alt=""></td>
<td><img src="img/2.jpg" alt=""></td>
<td><img src="img/3.jpg" alt=""></td>
<td><img src="img/4.jpg" alt=""></td>
<td><img src="img/5.jpg" alt=""></td>
<td><img src="img/6.jpg" alt=""></td>
</tr>
</table>
</div>
<ul class="imgview-nav" id="imgviewNav">
<li>1</li>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5</li>
<li>6</li>
</ul>
<span>左边</span>
<span>右边</span>
</div>
<script>
var imgView = document.getElementById('imgView'),
imgWidth = imgView.getElementsByTagName('img'),
btn = document.getElementsByTagName('li'),
len = btn.length,
imgNum = 0,
endPos = 0,
timer = null,
timer2 = null,
conSpan = document.getElementsByTagName('span')
conSpan[0].onclick = function (){
if (timer) {
clearInterval(timer)
}
if (timer2) {
clearInterval(timer2)
}
imgNum--
if (imgNum <0 ) {
imgNum = len
}
timer = setInterval(move, 16)
timer2 = setInterval(autoMove, 3000)
}
conSpan[1].onclick = function (){
if (timer) {
clearInterval(timer)
}
if (timer2) {
clearInterval(timer2)
}
imgNum++
if (imgNum == len ) {
imgNum = 0
}
timer = setInterval(move, 16)
timer2 = setInterval(autoMove, 3000)
}
//绑定事件。添加移动效果
for (var i = 0i <leni++) {
btn[i].index = i
btn[i].onmouseover = function(){
clearInterval(timer2)
imgNum = this.index
if (timer) {
clearInterval(timer)
}
timer = setInterval(move, 16)
}
btn[i].onmouseout = function(){
timer2 = setInterval(autoMove, 2000)
}
}
//图片缓动效果，原理是保持步数不变，改变距离的同时改变速度
function move(){
var starPos = imgView.scrollLeft,
speed
endPos = imgNum * imgWidth[0].offsetWidth
speed = (endPos - starPos) / 20
if (speed == 0) {
clearInterval(timer)
} else if(speed >0){
speed = Math.ceil(speed)
} else {
speed = Math.floor(speed)
}
imgView.scrollLeft = starPos + speed
}
//控制图片的自动滚动，通过控制索引值来控制图片的自动滚动
function autoMove(){
imgNum++
if(imgNum == len) {
imgNum = 0
}
timer = setInterval(move, 20)
}timer2 = setInterval(autoMove, 2000)
</script>
</body>
</html>
