用html +js+css 实现页面轮播图效果
html 页面
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<link rel="stylesheet" href="carousel.css">
<title>轮播图效果</title>
</head>
<body>
<section id="main">
<div id="picture"></div>
<!-- 添加图中按钮 图片轮播在js中大致成型后再写最好-->
<div id="dot">
<span></span>
<span></span>
<span></span>
<span></span>
<span></span>
</div>
<!-- 添加切换按钮 -->
<div id="an">
<div class="left"><</div>
<div class="right">></div>
</div>
</section>
<script src="jquery.js"></script>
<script src="carousel.js"></script>
</body>
css页面 carousel.css
#main{
width: 655px;
height: 361px;
position: relative;
}
#picture{
width:100%;
height: 100%;
}
#picture img{
width:100%;
height: 100%;
display: none;
}
#picture img:nth-child(1){
display: inline-block;
}
/* 设置圆点的样式 */
#dot span{
display: inline-block;
width:25px;
height: 25px;
border-radius: 50%;
background-color: gray;
margin-left: 10px;
opacity: 0.6
}
#dot{
position: absolute;
right: 40px;
bottom: 30px;
}
/* 设置页面刚加载的圆点初始状态 1 第一个圆点放大1.2倍 2、颜色变成蓝色
*/
#dot :nth-of-type(1){
transform: scale(1.2);
background-color: blue;
}
.left ,.right{
width: 40px;
height: 40px;
border-radius: 50%;
font-size: 30px;
color: white;
position: absolute;
bottom: calc((100% - 40px)/2);
text-align: center;
}
.left{
left: 15px;
}
.right{
right: 15px;
}
.left:hover ,.right:hover{
background-color: white;
color:red;
}
js页面 carousel.jsfor(var i=1; i<6;i++){
$('#picture').append("<img src='./../images/"+i+".jpg' >");
}
//给图片转化设置定时函数
var index=0;
var timer;
function changeImageDot(){
$('#picture img:nth-child('+(index+1)+')').css({
display:'block',
}).siblings().css({
display:'none',
});
//设置随图片切换,对应的圆点样式发生变化
// index+1 是因为索引是从0开始而 nth-child(i) 中的i是从1 开始的
$('#dot span:nth-child('+(index+1)+')').css({
transform: 'scale(1.2)',
'background-color': 'blue',
}).siblings().css({
transform: 'scale(1)',
'background-color':'gray',
});
}
function produceTime(){
timer=setInterval(function(){
index++;
if(index==5)
index=0;
changeImageDot();
},2000);
}
produceTime();
//鼠标悬浮在圆点上 , 圆点和图片的变化
$('#dot span').mouseenter(function(){
index=$(this).index();
changeImageDot();
clearInterval(timer);
produceTime();
});
//缺点:点击切换按钮后,图片切换后 ,会立即切换到下一个图片,需要设置 清除计时器后再新建一个计时器
$('.left').click(function(){
index--;
if(index==-1)
index=4;
changeImageDot();
clearInterval(timer);
produceTime();
});
$('.right').click(function(){
index++;
if(index==5)
index=0;
changeImageDot();
clearInterval(timer);
produceTime();
});