flex布局设置底部固定导航条

初步接触flex，话不多说，效果图如下:
flex布局设置底部固定导航条

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<style>
  .box{
    display: flex;
    flex-direction: column;
    min-height: 100vh;/*100vh == height:100%,元素撑开与屏幕等高*/
  }
  .content{
    flex: 1;
  }
  .footer{
    width: 100%;
    height: 50px;
    border: 1px solid black;
    display: flex;
    flex-direction: row;
    display: flex;
  }
  .nav{
    flex:1;/*等分*/
    border: 1px solid red;
  }
</style>
<body>
<div class="box">
  <div class="content">index</div>
  <div class="footer">
    <div class="nav">第一</div>
    <div class="nav">第二</div>
    <div class="nav">第三</div>
  </div>
</div>
</body>
</html>

flex布局设置底部固定导航条

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