学习完轮播图,但还有些搞不明白,可能是做到少的原因,往后做的多可能就明白了
轮播图代码:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
* {
padding: 0;
margin: 0;
list-style: none;
border: 0;
}
.all {
width: 500px;
height: 200px;
padding: 7px;
border: 1px solid #ccc;
margin: 100px auto;
position: relative;
}
.screen {
width: 500px;
height: 200px;
overflow: hidden;
position: relative;
}
.screen li {
width: 500px;
height: 200px;
overflow: hidden;
float: left;
}
.screen ul {
position: absolute;
left: 0;
top: 0px;
width: 3000px;
}
.all ol {
position: absolute;
right: 10px;
bottom: 10px;
line-height: 20px;
text-align: center;
}
.all ol li {
float: left;
width: 20px;
height: 20px;
background: #fff;
border: 1px solid #ccc;
margin-left: 10px;
cursor: pointer;
}
.all ol li.current {
background: #DB192A;
}
#arr {
display: none;
}
#arr span {
width: 40px;
height: 40px;
position: absolute;
left: 5px;
top: 50%;
margin-top: -20px;
background: #000;
cursor: pointer;
line-height: 40px;
text-align: center;
font-weight: bold;
font-family: '黑体';
font-size: 30px;
color: #fff;
opacity: 0.3;
border: 1px solid #fff;
}
#arr #right {
right: 5px;
left: auto;
}
</style>
</head>
<body>
<div class="all" id='box'>
<div class="screen"><!--相框-->
<ul>
<li>
<img src="images/1.jpg" width="500" height="200"/>
</li>
<li>
<img src="images/2.jpg" width="500" height="200"/>
</li>
<li>
<img src="images/3.jpg" width="500" height="200"/>
</li>
<li>
<img src="images/4.jpg" width="500" height="200"/>
</li>
<li>
<img src="images/5.jpg" width="500" height="200"/>
</li>
</ul>
<ol>
</ol>
</div>
<div id="arr"><span id="left"><</span><span id="right">></span></div>
</div>
<script src="common.js"></script>
<script>
//获取最外面的div
var box = my$("box")
//获取相框
var screen = box.children[0];
//获取相框的宽度
var imgWidth = screen.offsetWidth;
//获取ul
var ulObj = screen.children[0];
//获取ul中的所有的li
var list = ulObj.children;
//获取ol
var olObj = screen.children[1];
//获取焦点的div
var arr = my$("arr");
var index = 0;//记录索引
//1.创建小按钮---根据ul中的li的个数
for (var i = 0; i < list.length; i++) {
var liObj = document.createElement("li")
olObj.appendChild(liObj);
liObj.innerHTML = i + 1;
liObj.setAttribute("index", i);
//注册鼠标进入事件
liObj.onmouseover = function () {
//先移除所有的背景颜色
for (var j = 0; j < olObj.children.length; j++) {
olObj.children[j].removeAttribute("class")
}
//设置当前的li的背景颜色
this.className = "current";
//获取鼠标进入li当前索引值
index = this.getAttribute("index")
//调用动画
animate(ulObj, -index * imgWidth);
}
}
//设置ol中第一个li的背景颜色
olObj.children[0].className = "current";
//克隆ul中的第一个li, 追加到ul的最后面
ulObj.appendChild(ulObj.children[0].cloneNode(true));
//2.自动播放
var timeId = setInterval(move, 1000);
//3.鼠标移入显示焦点左右的div, 并清除定时器
box.onmouseover = function () {
arr.style.display = "block"
clearInterval(timeId)
}
//3.鼠标移出显示焦点左右的div, 并开启定时器
box.onmouseout = function () {
arr.style.display = "none"
timeId = setInterval(move, 1000);
}
//4.点击右边按钮
my$("right").onclick=move;
//点击左边按钮
my$("left").onclick=function () {
if (index==0){
index=5;
ulObj.style.left = -index*imgWidth+"px";
}
index--;
animate(ulObj,-index*imgWidth);
for (var i=0;i<olObj.children.length;i++){
olObj.children[i].removeAttribute("class")
}
olObj.children[index].className="current";
}
//封装自动播放的函数
function move() {
if (index == list.length - 1) {
//瞬间跳转到第一张图
ulObj.style.left = 0 + "px"
index = 0;
}
index++;
animate(ulObj, -index * imgWidth);
//判断按钮的背景颜色 , 如果index = 最后一个值的时候, 瞬间设置第一个的按钮的颜色
if (index == list.length - 1) {
//设置第一个li的颜色
olObj.children[0].className = "current";
//清除最后一个按钮的颜色
olObj.children[olObj.children.length-1].className="";
} else {
//更改小按钮的样式
for (var i = 0; i < olObj.children.length; i++) {
olObj.children[i].removeAttribute("class")
}
//设置对应的li的背景颜色
olObj.children[index].className = "current"
}
}
</script>
</body>
</html>