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loading效果.html

<!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>Document</title>
</head>
<body>


  <style>
  .loading{
    width: 200px;
    height: 30px;
    background-color: gray;
    border-radius: 15px;
    overflow: hidden;
  }
  .loading::after{
    display: block;
    content: "";
    width: 0;
    height: 100%;
    background-color: red;
    transition: width 2s;
  }
  .loading.runing::after{
    width: 100%;
  }
  </style>

  <div class="loading"></div>


</body>
</html>