<!-- <!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>进度条练习</title>
<style>
.bar{
width: 150px;
height: 15px;
border: 1px solid red;
border-radius: 7px;
}
.bar_in{
width: 50%;
height: 100%;
background-color: red;
transition: all 0.7s;
border-radius: 7px;
}
.bar:hover .bar_in{
width: 100%;
}
</style>
</head>
<body>
<div class="bar">
<div class="bar_in">
</div>
</div>
</body>
</html> -->
