<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title></title> <style type="te
<!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: yellow;
}
#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">
<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>
//要做实现找人
var box = document.getElementById("box");
var screen = box.children[0];
var ul = screen.children[0];
var ulLis = ul.children;
var ol = screen.children[1];
var arr = document.getElementById("arr");
var arrRight = document.getElementById("right");
var arrLeft = document.getElementById("left");
//图片宽度
var imgWidth = screen.offsetWidth;
var timer = null;
for (var i = 0; i < ulLis.length; i++) {
var li = document.createElement("li");
li.innerHTML = i + 1;
ol.appendChild(li);
}
var olLis = ol.children;
olLis[0].className = "current";
var firstImg = ulLis[0].cloneNode(true);
ul.appendChild(firstImg);
for (var j = 0; j < olLis.length; j++) {
olLis[j].index = j;
olLis[j].onmouseover = function () {
for (var k = 0; k < olLis.length; k++) {
olLis[k].className = "";
}
this.className = "current";
var target = -this.index * imgWidth;
animate(ul, target);
//把当前按钮的索引 赋值给pic
//pic = this.index;
//还要把当前按钮的索引 赋值给square
//square = this.index;
pic = square = this.index;
}
}
box.onmouseover = function () {
arr.style.display = "block";
clearInterval(timer);
}
box.onmouseout = function () {
arr.style.display = "none";
timer = setInterval(playNext, 1000);
}
//3.2点击右侧按钮 将ul移动到对应位置
var pic = 0;//用于表示应该向左移动的图片的张数 也表示当前图片的索引
var square = 0;//用于保存当前应该亮起的按钮
arrRight.onclick = function () {
playNext();
}
arrLeft.onclick = function () {
//如果pic等于第一张图片的索引 再点击就该跳转到最后了
if (pic == 0) {
//往左移动了ulLis.length - 1张
//也就是往左移动了(ulLis.length - 1) * imgWidth
ul.style.left = -(ulLis.length - 1) * imgWidth + "px";
pic = ulLis.length - 1;
}
pic--;
//目标 和 pic有关 和 图片宽度有关 而且是 负数
var target = -pic * imgWidth;
animate(ul, target);
//按钮也跟着走
//square 表示当前应该亮起的按钮
//如果大于第一个按钮的索引就减 否则就该等于最后一个按钮的索引
if (square > 0) {
square--;
} else {
square = olLis.length - 1;
}
//按钮排他
//干掉所有人
for (var i = 0; i < olLis.length; i++) {
olLis[i].className = "";
}
//留下当前的
olLis[square].className = "current";
}
//4.添加自动滚动
timer = setInterval(playNext, 1000);
function playNext() {
//如果pic等于最后一张图片的索引 再点击就该跳转了
if (pic == ulLis.length - 1) {
ul.style.left = 0;
pic = 0;
}
pic++;
//目标 和 pic有关 和 图片宽度有关 而且是 负数
var target = -pic * imgWidth;
animate(ul, target);
//按钮也跟着走
//square 表示当前应该亮起的按钮
//如果小于最后一个按钮的索引 就加否则就该等于0 了
if (square < olLis.length - 1) {
square++;
} else {
square = 0;
}
//按钮排他
//干掉所有人
for (var i = 0; i < olLis.length; i++) {
olLis[i].className = "";
}
//留下当前的
olLis[square].className = "current";
}
function animate(obj, target) {
clearInterval(obj.timer);
obj.timer = setInterval(function () {
var leader = obj.offsetLeft;
var step = 35;
step = leader < target ? step : -step;
if (Math.abs(target - leader) > Math.abs(step)) {
leader = leader + step;
obj.style.left = leader + "px";
} else {
obj.style.left = target + "px";
clearInterval(obj.timer);
}
}, 15)
}
</script>
</body>
</html>
