轮播图

来源：互联网发布：勇者之塔精灵魂力数据编辑：程序博客网时间：2024/05/21 05:58

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>

* {
margin: 0;
padding: 0;
text-decoration: none;
}
body {
padding: 20px;
}
#container {
width: 600px;
height: 400px;
border: 3px solid #333;
overflow: hidden;
position: relative;
}
#list {
width: 4200px;
height: 400px;
position: absolute;
z-index: 1;
}
#list img {
width: 600px;
height: 400px;
float: left;
}
#buttons {
position: absolute;
height: 10px;
width: 100px;
z-index: 2;
bottom: 20px;
left: 250px;
}
#buttons span {
cursor: pointer;
float: left;
border: 1px solid #fff;
width: 10px;
height: 10px;
border-radius: 50%;
background: #333;
margin-right: 5px;
}
#buttons .on {
background: orangered;
}
.arrow {
cursor: pointer;
display: none;
line-height: 39px;
text-align: center;
font-size: 36px;
font-weight: bold;
width: 40px;
height: 40px;
position: absolute;
z-index: 2;
top: 180px;
background-color: RGBA(0, 0, 0, .3);
color: #fff;
}
.arrow:hover {
background-color: RGBA(0, 0, 0, .7);
}
#container:hover .arrow {
display: block;
}
#prev {
left: 20px;
}
#next {
right: 20px;
}
*{ padding:0; margin:0;}/*去掉标签自带的间隙*/
</style>
</head>
<body>
<div id="container">
    <div id="list" style="left: -600px;">
      <img src="./img/5.jpg" alt="1" width="50px" height="50px" />
      <img src="./img/1.jpg" alt="1" width="50px" height="50px" />
      <img src="./img/2.jpg" alt="2" width="50px" height="50px" />
      <img src="./img/3.jpg" alt="3" width="50px" height="50px" />
      <img src="./img/4.jpg" alt="4" width="50px" height="50px" />
      <img src="./img/5.jpg" alt="5" width="50px" height="50px" />
      <img src="./img/1.jpg" alt="5"width="50px" height="50px" />
    </div>
    <div id="buttons">
      <span index="1" class="on"></span>
      <span index="2"></span>
      <span index="3"></span>
      <span index="4"></span>
      <span index="5"></span>
    </div>
    <a href="javascript:;" id="prev" class="arrow"><</a>
    <a href="javascript:;" id="next" class="arrow">></a>
</body>
</html>
<script src=""></script>
<script type="text/javascript">
/* 知识点： */
/* this用法 */
/* DOM事件 */
/* 定时器 */
window.onload = function () {
var container = document.getElementById('container');
var list = document.getElementById('list');
var buttons = document.getElementById('buttons').getElementsByTagName('span');
var prev = document.getElementById('prev');
var next = document.getElementById('next');
var index = 1;
var timer;
function animate(offset) {
//获取的是style.left，是相对左边获取距离，所以第一张图后style.left都为负值，
//且style.left获取的是字符串，需要用parseInt()取整转化为数字。
var newLeft = parseInt(list.style.left) + offset;
list.style.left = newLeft + 'px';
//无限滚动判断
if (newLeft > -600) {
list.style.left = -3000 + 'px';
}
if (newLeft < -3000) {
list.style.left = -600 + 'px';
}
}
function play() {
//重复执行的定时器
timer = setInterval(function () {
next.onclick();
}, 2000)
}
function stop() {
clearInterval(timer);
}
function buttonsShow() {
//将之前的小圆点的样式清除
for (var i = 0; i < buttons.length; i++) {
if (buttons[i].className == "on") {
buttons[i].className = "";
}
}
//数组从0开始，故index需要-1
buttons[index - 1].className = "on";
}
prev.onclick = function () {
index -= 1;
if (index < 1) {
index = 5
}
buttonsShow();
animate(600);
};
next.onclick = function () {
//由于上边定时器的作用，index会一直递增下去，我们只有5个小圆点，所以需要做出判断
index += 1;
if (index > 5) {
index = 1
}
animate(-600);
buttonsShow();
};
for (var i = 0; i < buttons.length; i++) {
buttons[i].onclick = function () {
//优化，当前图片点击当前的小圆点不执行以下代码。
if (this.className == "on") {
return;
}
/* 这里获得鼠标移动到小圆点的位置，用this把index绑定到对象buttons[i]上，去谷歌this的用法 */
/* 由于这里的index是自定义属性，需要用到getAttribute()这个DOM2级方法，去获取自定义index的属性*/
var clickIndex = parseInt(this.getAttribute('index'));
var offset = 600 * (clickIndex - index); //这个index是当前图片停留时的index
animate(offset);
index = clickIndex; //存放鼠标点击后的位置，用于小圆点的正常显示
buttonsShow();
}
}
container.onmouseover = stop;
container.onmouseout = play;
play();
}
</script>

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