js轮播
Posted 小高
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
* {
margin: 0;
padding: 0;
list-style: none;
}
#wrap {
width: 590px;
height: 340px;
margin: 50px auto;
border: #000 1px solid;
overflow: hidden;
position: relative;
}
#wrap a {
display: block;
width: 50px;
height: 30px;
background: #000;
opacity: .5;
color: #fff;
line-height: 30px;
text-align: center;
position: absolute;
top: 50%;
margin-top: -15px;
text-decoration: none;
font-weight: 900;
font-size: 24px;
z-index: 990;
}
#prev {
left: 0;
}
#next {
right: 0;
}
#btn {
position: absolute;
left: 50%;
bottom: 10px;
width: 130px;
margin-left: -65px;
z-index: 999;
}
#btn li {
width: 20px;
height: 20px;
float: left;
margin-left: 6px;
border-radius: 50%;
background: #c00;
}
#btn li.active {
background: #ccc;
}
#box {
height: 340px;
position: absolute;
}
#box li {
width: 590px;
height: 340px;
position: absolute;
left: 0;
top: 0;
opacity:0;
}
#box img {
width: 590px;
height: 340px;
}
</style>
<script src="move.js"></script>
<script>
window.onload = function () {
var oWrap = document.getElementById(‘wrap‘);
var oBox = document.getElementById(‘box‘);
var oBtn = document.getElementById(‘btn‘);
var aBtn = oBtn.children;
var aLi = oBox.children;
var oPrev = document.getElementById(‘prev‘);
var oNext = document.getElementById(‘next‘);
var iNow = 0;
for (var i = 0; i < aBtn.length; i++) {
aBtn[i].index = i;
aBtn[i].onclick = function () {
iNow = this.index;
tab();
}
}
function tab() {
for (var i = 0; i < aLi.length; i++) {
aBtn[i].className = ‘‘;
move(aLi[i], {opacity: 0});
}
aBtn[iNow].className = ‘active‘;
move(aLi[iNow], {opacity: 1});
}
oPrev.onclick = function () {
iNow--;
if (iNow == -1)iNow = aBtn.length - 1;
tab();
};
oNext.onclick = next;
function next() {
iNow++;
if (iNow == aBtn.length)iNow = 0;
tab();
}
var timer = null;
timer = setInterval(next,3000);
oWrap.onmouseover = function(){
clearInterval(timer);
};
oWrap.onmouseout = function(){
timer = setInterval(next,3000);
};
}
</script>
</head>
<body>
<div id="wrap">
<a href="javascript:;" id="prev">←</a>
<a href="javascript:;" id="next">→</a>
<ul id="box">
<li style="opacity:1;"><img src="img/1.jpg" /></li>
<li><img src="img/2.jpg" /></li>
<li><img src="img/3.jpg" /></li>
<li><img src="img/4.jpg" /></li>
<li><img src="img/5.jpg" /></li>
</ul>
<ol id="btn">
<li class="active"></li>
<li></li>
<li></li>
<li></li>
<li></li>
</ol>
</div>
</body>
</html>
/**
* Created by Administrator on 2016/11/3.
*/
function getStyle(obj, name) {
if (obj.currentStyle) {
return obj.currentStyle[name];
} else {
return getComputedStyle(obj, false)[name];
}
}
function move(obj, json, options) {
clearInterval(obj.timer);
options = options || {};
options.time = options.time || 500;
options.easeing = options.easeing || ‘ease-out‘;
var dis = {};
var start = {};
for (var name in json) {
start[name] = parseFloat(getStyle(obj, name));
dis[name] = json[name] - start[name];
}
var count = Math.floor(options.time / 30);
var n = 0;
obj.timer = setInterval(function () {
n++;
for (var name in json) {
switch (options.easeing) {
case ‘linear‘:
var a = n / count;
var cur = start[name] + dis[name] * a;
break;
case ‘ease-in‘:
var a = n / count;
var cur = start[name] + dis[name] * a * a * a;
break;
case ‘ease-out‘:
var a = 1 - n / count;
var cur = start[name] + dis[name] * (1 - a * a * a);
}
if (name == ‘opacity‘) {
obj.style.opacity = cur;
obj.style.filter = ‘alpha(opacity:‘ + cur * 100 + ‘)‘;
} else {
obj.style[name] = cur + ‘px‘;
}
}
if (n == count) {
clearInterval(obj.timer);
options.fn && options.fn();
}
}, 30);
}
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