原生js实现轮播图特效
轮播图也称为焦点图,是网页中比较常见的网页特效。
功能需求:
1.鼠标经过轮播图模块,左右按钮显示,离开隐藏左右按钮。
2.点击右侧按钮一次,图片往左播放一张,以此类推,左侧按钮同理。
3.图片播放的同时,下面小圆圈模块跟随一起变化。
4.点击小圆圈,可以播放相应图片。
5.鼠标不经过轮播图,轮播图也会自动播放图片。
6.鼠标经过,轮播图模块, 自动播放停止。
此文章的代码为一个完整的轮播图的实现代码,复制即可运行
实现效果由于大小问题无法上传,可自行观看淘宝或京东首页轮播图效果
html文件:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<link rel="stylesheet" href="css/index.css" rel="external nofollow" >
<script src="js/animate.js"></script>
<script src="js/index.js"></script>
</head>
<body>
<div class="box">
<ul>
<li><img src="img/focus.jpg" alt=""></li>
<li><img src="img/focus1.jpg" alt=""></li>
<li><img src="img/focus2.jpg" alt=""></li>
<li><img src="img/focus3.jpg" alt=""></li>
</ul>
<ol>
</ol>
<div class="arr-l"> < </div>
<div class="arr-r"> > </div>
</div>
</body>
</html>
css文件:
* {
margin: 0;
padding: 0;
outline: none;
}
.box {
overflow: hidden;
position: relative;
height: 455px;
width: 721px;
background-color: pink;
margin: 50px auto;
}
.box ul {
position: absolute;
top: 0;
left: 0;
width: 600%;
}
.box ul li {
list-style: none;
float: left;
}
.box ol {
position: absolute;
bottom: 10px;
left: 100px;
background-color: rgba(255, 255, 255, .3);
border-radius: 8px;
list-style: none;
height: 10px;
padding: 2px 5px;
}
.box ol li {
cursor: pointer;
float: left;
height: 8px;
width: 8px;
border: 1px solid #fff;
border-radius: 50%;
margin: 0 5px;
}
.arr-l,
.arr-r {
display: none;
color: #fff;
cursor: pointer;
position: absolute;
height: 40px;
width: 30px;
background-color: rgba(0, 0, 0, .3);
line-height: 40px;
text-align: center;
}
.arr-l {
top: 50%;
left: 0;
transform: translateY(-50%);
}
.arr-r {
right: 0;
top: 50%;
transform: translateY(-50%);
}
.current {
background-color: #fff;
}
动画实现js文件animate.js:
function animate(obj, target, callback) {
clearInterval(obj.timer);
obj.timer = setInterval(function () {
if (target - obj.offsetLeft > 0) {
var step = Math.ceil((target - obj.offsetLeft) / 10);
} else {
var step = Math.floor((target - obj.offsetLeft) / 10);
}
if (obj.offsetLeft == target) {
clearInterval(obj.timer);
callback && callback();
}
obj.style.left = obj.offsetLeft + step + 'px';
}, 15)
}
index.js:
window.addEventListener('load', function () {
var arrl = this.document.querySelector('.arr-l');
var arrr = this.document.querySelector('.arr-r');
var box = this.document.querySelector('.box');
var boxWidth = box.offsetWidth;
box.addEventListener('mouseenter', function () {
arrl.style.display = 'block';
arrr.style.display = 'block';
clearInterval(timer);
timer = null;
})
box.addEventListener('mouseleave', function () {
arrl.style.display = 'none';
arrr.style.display = 'none';
timer = setInterval(function () {
arrr.click();
}, 2000);
});
var ul = box.querySelector('ul');
var ol = box.querySelector('ol');
for (var i = 0; i < ul.children.length; i++) {
var li = document.createElement('li');
li.setAttribute('data-index', i);
ol.appendChild(li);
ol.children[0].className = 'current';
li.addEventListener('click', function () {
for (var i = 0; i < ol.children.length; i++) {
ol.children[i].className = '';
}
this.className = 'current';
var dateindex = this.getAttribute('data-index');
num = dateindex;
circle = dateindex;
animate(ul, -dateindex * boxWidth);
});
}
var first = ul.children[0].cloneNode(true);
ul.appendChild(first);
var num = 0;
var circle = 0;
var flag = true;
arrr.addEventListener('click', function () {
if (flag) {
flag = false;
if (num == ul.children.length - 1) {
ul.style.left = 0;
num = 0;
}
num++;
animate(ul, -num * boxWidth, function () {
flag = true;
});
circle++;
if (circle == ol.children.length) {
circle = 0;
}
circleChange();
}
});
arrl.addEventListener('click', function () {
if (flag) {
flag = false;
if (num == 0) {
num = ul.children.length - 1;
ul.style.left = -num * boxWidth + 'px';
}
num--;
animate(ul, -num * boxWidth, function () {
flag = true;
});
circle--;
if (circle < 0) {
circle = ol.children.length - 1;
}
circleChange();
}
});
function circleChange() {
for (var i = 0; i < ol.children.length; i++) {
ol.children[i].className = '';
}
ol.children[circle].className = 'current';
}
var timer = setInterval(function () {
arrr.click();
}, 2000);
})
注意事项
引用两个js文件时,animate.js要在index.js之前引用,因为index.js中要用到animate.js里的函数。
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