<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
* {
margin: 0;
padding: 0;
text-decoration: none;
}
body {
padding-top: 20px; /*图片距顶上的高度 */
padding-left: 300px; /*图片距左边的高度 */
padding-right: 300px; /*图片距右边的高度 */
}
#container {
position: relative;
width: 800px; /*框的宽 */
height: 400px; /*框的高 */
border: 3px solid #333; /*框的线 */
overflow: hidden;
}
#list {
position: absolute;
z-index: 1;
width: 4200px;
height: 400px;
}
#list img {
float: left;
width: 800px; /*图片的宽 */
height: 400px;
}
#buttons {
position: absolute;
left: 400px;
bottom: 20px;
z-index: 2;
height: 10px;
width: 100px;
}
#buttons span {
float: left;
margin-right: 5px;
width: 10px;
height: 10px;
border: 1px solid #fff;
border-radius: 50%;
background: #333;
cursor: pointer;
}
#buttons .on {
background: orangered;
}
.arrow {
position: absolute;
top: 180px;
z-index: 2;
display: none;
width: 40px;
height: 40px;
font-size: 36px;
font-weight: bold;
line-height: 39px;
text-align: center;
color: #fff;
background-color: RGBA(0, 0, 0, .3);
cursor: pointer;
}
.arrow:hover {
background-color: RGBA(0, 0, 0, .7);
}
#container:hover .arrow {
display: block;
}
#prev {
left: 20px;
}
#next {
right: 20px;
}
</style>
<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 >= -800) { /*移动距离*/
list.style.left = -3200 + 'px';
}
if (newLeft <= -3200) {
list.style.left = -800 + 'px'; /*移动距离*/
}
}
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(800);/*移动距离*/
};
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(-800);/*移动距离*/
buttonsShow();
};
for (var i = 0; i < buttons.length; i++) {
(function (i) {
buttons[i].onclick = function () {
/* 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 = 800 * (index - clickIndex); //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();
}
})(i)
}
container.onmouseover = stop;
container.onmouseout = play;
play();
}
</script>
</head>
<body>
<div id="container">
<div id="list" style="left: -800px;">
<img src="img/5.jpg" alt="1"/>
<img src="img/1.jpg" alt="1"/>
<img src="img/2.jpg" alt="2"/>
<img src="img/3.jpg" alt="3"/>
<img src="img/4.jpg" alt="4"/>
<img src="img/5.jpg" alt="5"/>
<img src="img/1.jpg" alt="5"/>
</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>
</div>
</body>
</html>
轮播图
最新推荐文章于 2022-06-30 22:57:48 发布