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simplification
/
test.html

<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <style type="text/css">
      div {
        width: 100px;
        height: 100px;
        background-color: pink;
        text-align: center;
        line-height: 100px;
        margin: 100px auto;
        position: relative;
      }
      div img {
        position: absolute;
        left: 0;
        top: 100px;
        display: none;
      }
      .box:hover img {
        display: block;
      }
    </style>
  </head>
  <body>
    <div class="box">
      可以是二维码
      <img src="../project/src/assets/images/custom.png" />
    </div>
  </body>
</html>