盒模型的应用

实现这样的一个布局

代码初步实现是这样的：

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    * {
      margin: 0;
      padding: 0;
    }
    .box {
      display: flex;
      flex-wrap: wrap;
    }
    .item {
      width: 50%;
    }
  </style>
</head>
<body>
  <div class="box">
    <div class="item">1</div>
    <div class="item">2</div>
    <div class="item">3</div>
    <div class="item">4</div>
  </div>
  <script lang="ts">
    
  </script>
</body> 
</html>

给 item 加上：border: 1px solid red; 后

因为 1px border 占用空间，width: 50% + 1px 导致一行两列装不下，被挤下来了，这时候需要改变每个item的盒模型，box-sizing: border-box; 就可以了

完整代码：

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    * {
      margin: 0;
      padding: 0;
    }
    .box {
      display: flex;
      flex-wrap: wrap;
    }
    .item {
      width: 50%;
      border: 1px solid red;
      box-sizing:  border-box;
    }
  </style>
</head>
<body>
  <div class="box">
    <div class="item">1</div>
    <div class="item">2</div>
    <div class="item">3</div>
    <div class="item">4</div>
  </div>
  <script lang="ts">
    
  </script>
</body> 
</html>

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