Claim:
- After the mouse passes the carousel module, the left and right buttons are displayed, and when left, the left and right buttons are hidden
- Click the right button once, the picture will be played to the left, and so on, the left button is the same
- While the picture is playing, the small circle module below changes along with it
- Click on the small circle to play the corresponding picture
- If the mouse does not pass the carousel, the carousel will automatically play the picture
- Mouse over, carousel diagram module, automatic playback stop
Realization effect:
Code:
autoPlay.html (copy and save as an html file, open it to see the effect):
<!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="https://blog-static.cnblogs.com/files/jacklzx/autoPlay.css">
<script src="https://blog-static.cnblogs.com/files/jacklzx/animate.js"></script>
<script src="https://blog-static.cnblogs.com/files/jacklzx/autoPlay.js"></script>
</head>
<body>
<div class="focus">
<a href="javascript:;" class="arrow-l"><</a>
<a href="javascript:;" class="arrow-r">></a>
<ul>
<li>
<a href="javascript:;"><img src="https://s1.ax1x.com/2020/10/12/0W1wlt.jpg" alt=""></a>
</li>
<li>
<a href="javascript:;"><img src="https://s1.ax1x.com/2020/10/12/0W3nHS.jpg" alt=""></a>
</li>
<li>
<a href="javascript:;"><img src="https://s1.ax1x.com/2020/10/12/0Wtrmq.jpg" alt=""></a>
</li>
<li>
<a href="javascript:;"><img src="https://s1.ax1x.com/2020/10/12/0W1NYd.jpg" alt=""></a>
</li>
</ul>
<ol class="circle">
</ol>
</div>
</body>
</html>
autoPlay.css：
li {
list-style: none;
}
a {
text-decoration: none;
}
* {
margin: 0;
padding: 0;
}
body {
background-color: #00e1ff;
}
.focus {
overflow: hidden;
position: relative;
width: 721px;
height: 455px;
margin: 100px auto;
box-shadow: 10px 10px 20px rgba(0, 0, 0, 0.6);
border-radius: 40px;
}
.focus ul {
position: absolute;
top: 0;
left: 0;
width: 600%;
}
.focus ul li {
float: left;
}
.arrow-l {
display: none;
position: absolute;
top: 50%;
left: -12px;
margin-top: -20px;
width: 40px;
height: 40px;
background: rgba(0, 0, 0, .3);
text-align: center;
line-height: 40px;
color: #fff;
font-size: 18px;
border-radius: 0 50% 50% 0;
z-index: 999;
}
.arrow-r {
display: none;
position: absolute;
top: 50%;
right: -12px;
margin-top: -20px;
width: 40px;
height: 40px;
background: rgba(0, 0, 0, .3);
text-align: center;
line-height: 40px;
color: #fff;
font-size: 18px;
border-radius: 50% 0 0 50%;
z-index: 999;
}
.circle {
position: absolute;
bottom: 10px;
left: 50%;
transform: translateX(-50%);
}
.circle li {
float: left;
width: 12px;
height: 12px;
border: 2px solid rgba(255, 255, 255, .5);
margin: 0 4px;
border-radius: 50%;
cursor: pointer;
}
.current {
background-color: #fff;
box-shadow: 0 0 10px #fff;
}
autoPlay.js：
window.addEventListener('load', function() {
var arrow_l = document.querySelector('.arrow-l');
var arrow_r = document.querySelector('.arrow-r');
var focus = document.querySelector('.focus');
var focusWidth = focus.offsetWidth;
var step = 5;
focus.addEventListener('mouseenter', function() {
arrow_l.style.display = 'block';
arrow_r.style.display = 'block';
clearInterval(timer);
timer = null;
});
focus.addEventListener('mouseleave', function() {
arrow_l.style.display = 'none';
arrow_r.style.display = 'none';
timer = setInterval(function() {
arrow_r.click();
}, 2000);
});
var ul = focus.querySelector('ul');
var ol = focus.querySelector('.circle');
for (var i = 0; i < ul.children.length; i++) {
var li = document.createElement('li');
li.setAttribute('index', i);
ol.appendChild(li);
li.addEventListener('click', function() {
for (var i = 0; i < ol.children.length; i++) {
ol.children[i].className = '';
}
this.className = 'current';
var index = this.getAttribute('index');
num = index;
circle = index;
animate(ul, -index * focusWidth, step);
});
}
ol.children[0].className = 'current';
var num = 0;
var circle = 0;
var first = ul.children[0].cloneNode(true);
ul.appendChild(first);
arrow_r.addEventListener('click', function() {
if (num == ul.children.length - 1) {
ul.style.left = 0;
num = 0;
}
num++;
animate(ul, -num * focusWidth, step);
circle++;
circle = circle == ol.children.length ? 0 : circle;
circleChange();
});
arrow_l.addEventListener('click', function() {
if (num == 0) {
num = ul.children.length - 1;
ul.style.left = -num * focusWidth + 'px';
}
num--;
animate(ul, -num * focusWidth, step);
circle--;
circle = circle < 0 ? (ol.children.length - 1) : circle;
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() {
arrow_r.click();
}, 2000);
});
animate.js：
function animate(obj, target, time, callback) {
clearInterval(obj.timer);
obj.timer = setInterval(function() {
var step = (target - obj.offsetLeft) / 10;
step = step > 0 ? Math.ceil(step) : Math.floor(step);
if (obj.offsetLeft == target) {
clearInterval(obj.timer);
callback && callback();
}
obj.style.left = obj.offsetLeft + step + 'px';
}, time);
}
Custom animation function animate details