知识点
- fadeto()
代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
#box{
height: 200px;
width: 200px;
margin: 200px;
border-radius: 50%;
background-color: red;
}
</style>
</head>
<body>
<div id="box"></div>
<script type="text/javascript" src="lib/jquery-3.3.1.js"></script>
<script type="text/javascript">
$(function () {
var opacity = 1;
var timer = setInterval(function () {
if (opacity <= 0){
opacity = 1;
}
opacity-=0.1;
$('#box').fadeTo(10,opacity);
},100);
});
</script>
</body>
</html>
运行结果
