思路：给定一个数组，储存每张图片的位置，旋转将位置进行替换
左旋转：将数组第一个数据删除，然后添加到数组的最后
右旋转：将数组最后一个数据删除，然后添加到数组的开头
先附上效果图，再来实现
接下来就是最主要的，封装原生js动画函数
//封装函数获取任意一个元素的任意属性的值（兼容ie8）
function getStyle(element, attr) {
return window.getComputedStyle ? window.getComputedStyle(element, null)[attr] : element.currentStyle[attr];
}
//封装js变速动画
function animate(element, json, fn) {
//每次启动定时器之前先停止
clearInterval(element.tmId);
element.tmId = setInterval(function () {
var flag = true;
//遍历对象中的每个属性
for (var attr in json) {
//执行透明度动画
if (attr == "opacity") {
//获取当前元素的属性值
var current = parseInt(getStyle(element, attr)*100);
//获取目标值
var target = json[attr]*100;
//移动的步数
var step = (target - current) / 10;
step = step > 0 ? Math.ceil(step) : Math.floor(step);
//移动后的值
current += step;
element.style[attr] = current / 100;
} else if (attr == "zIndex") {
//改变层级属性
element.style[attr] = json[attr];
} else {
//获取当前元素的属性值
var current = parseInt(getStyle(element, attr));
//获取目标值
var target = json[attr];
//移动的步数
var step = (target - current) / 10;
step = step > 0 ? Math.ceil(step) : Math.floor(step);
//移动后的值
current += step;
element.style[attr] = current + "px";
if (current != target) {
flag = false;
}
}
}
if (flag) {
clearInterval(element.tmId);
//如果有回调函数就调用
if (fn) fn();
}
// 测试
// console.log("目标：" + target + "/当前：" + current + "/步数：" + step);
}, 20);
}
封装完函数，剩下的直接调用就可以了，最后附上旋转木马完整代码?
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>旋转木马轮播图</title>
<link rel="stylesheet" href="css/css(1).css" rel="external nofollow" />
<script src="common.js"></script>
<script>
var config = [
{
width: 400,
top: 20,
left: 50,
opacity: 0.2,
zIndex: 2
},//0
{
width: 600,
top: 70,
left: 0,
opacity: 0.8,
zIndex: 3
},//1
{
width: 800,
top: 100,
left: 200,
opacity: 1,
zIndex: 4
},//2
{
width: 600,
top: 70,
left: 600,
opacity: 0.8,
zIndex: 3
},//3
{
width: 400,
top: 20,
left: 750,
opacity: 0.2,
zIndex: 2
}//4
];
window.onload = function () {
var flag = true;
var list = $query("#slide").getElementsByTagName("li");
function flower() {
//1、图片散开
for (var i = 0; i < list.length; i++) {
//设置每个li的宽，透明度，left,top，zindex
animate(list[i], config[i], function () {
flag = true;
});
}
}
flower();//初始化调用函数
//按钮的显示与隐藏
$query("#slide").onmouseover = function () {
$query("#arrow").style.opacity = "1";
}
$query("#slide").onmouseout = function () {
$query("#arrow").style.opacity = "0";
}
//点击切换
$query("#arrLeft").onclick = function () {
if (flag) {
config.unshift(config.pop());
flower();
flag = false;
}
}
$query("#arrRight").onclick = function () {
if (flag) {
config.push(config.shift());
flower();
flag = false;
}
}
//自动切换
setInterval(function () {
config.push(config.shift());
flower();
}, 2000);
}
</script>
</head>
<body>
<div class="wrap" id="wrap">
<div class="slide" id="slide">
<ul>
<li><a href="#"><img src="images/slidepic1.jpg" alt=""/></a></li>
<li><a href="#"><img src="images/slidepic2.jpg" alt=""/></a></li>
<li><a href="#" ><img src="images/slidepic3.jpg" alt=""/></a></li>
<li><a href="#"><img src="images/slidepic4.jpg" alt=""/></a></li>
<li><a href="#"><img src="images/slidepic5.jpg" alt=""/></a></li>
</ul>
<div class="arrow" id="arrow">
<a href="javascript:void(0);" class="prev" id="arrLeft"></a>
<a href="javascript:void(0);" class="next" id="arrRight"></a>
</div>
</div>
</div>
</body>
</html>
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