边框 (Borders)

Bootstrap 5 官方文档

1. 添加边框 (Border)

(1). 四周添加边框 class = “border”

(2). 仅添加上边框 class = “border-top”

(3). 仅添加下边框 class = “border-bottom”

(4). 仅添加左边框 class = “border-start”

(5). 仅添加右边框 class = “border-end”

  <div class = "container">
    <div class="bg-primary bg-opacity-50 border">全边框</div>
    <br />
    <div class="bg-primary bg-opacity-50 border-top">上边框</div>
    <br />
    <div class="bg-primary bg-opacity-50 border-bottom">下边框</div>
    <br />
    <div class="bg-primary bg-opacity-50 border-start">左边框</div>
    <br />
    <div class="bg-primary bg-opacity-50 border-end">右边框</div>
  </div>

(6). 除去四周边框 class = “border-0”

(7). 仅除去上边框 class = “border-top-0”

(8). 仅除去下边框 class = “border-bottom-0”

(9). 仅除去左边框 class = “border-start-0”

(10). 仅除去右边框 class = “border-end-0”

要想除去某一条边的边框, 前提是有边框, 如果是无边框下使用该类, 则无效果

  <div class = "container">
    <div class="bg-primary bg-opacity-50 border border-0">除去全边框</div>
    <br />
    <div class="bg-primary bg-opacity-50 border border-top-0">除去上边框</div>
    <br />
    <div class="bg-primary bg-opacity-50 border border-bottom-0">除去下边框</div>
    <br />
    <div class="bg-primary bg-opacity-50 border border-start-0">除去左边框</div>
    <br />
    <div class="bg-primary bg-opacity-50 border border-end-0">除去右边框</div>
  </div>

2. 边框颜色 (Border color)

  <div class = "container">
    <div class="bg-light border border-primary">border-primary</div>
    <br />
    <div class="bg-light border border-secondary">border-secondary</div>
    <br />
    <div class="bg-light border border-success">border-success</div>
    <br />
    <div class="bg-light border border-danger">border-danger</div>
    <br />
    <div class="bg-light border border-warning">border-warning</div>
    <br />
    <div class="bg-light border border-info">border-info</div>
    <br />
    <div class="bg-light border border-light">border-light</div>
    <br />
    <div class="bg-light border border-dark">border-dark</div>
    <br />
    <div class="bg-light border border-white">border-white</div>
  </div>

3. 边框宽度 (Border-width)

border-N N介于 1 – 5 之间

N的单位是像素

  <div class = "container">
    <div class="bg-light border border-primary">默认</div>
    <br />
    <div class="bg-light border border-1 border-primary">border-1</div>
    <br />
    <div class="bg-light border border-2 border-primary">border-2</div>
    <br />
    <div class="bg-light border border-3 border-primary">border-3</div>
    <br />
    <div class="bg-light border border-4 border-primary">border-4</div>
    <br />
    <div class="bg-light border border-5 border-primary">border-5</div>
  </div>

4. 边框圆角 (Border-radius)

(1). 四个角圆角 class = “rounded”

(2). 左上角和右上角圆角 class = “rounded-top”

(3). 左下角和右下角圆角 class = “rounded-bottom”

(4). 左上角和左下角圆角 class = “rounded-start”

(5). 右上角和右下角圆角 class = “rounded-end”

(6). 圆形边框 class = “rounded-circle”

当高度和宽度相等时, 为圆形, 否则为椭圆形

(7). 药丸形边框 class = “rounded-pill”

  <div class="bg-light border border-primary rounded">rounded</div>
  <br />
  <div class="bg-light border border-primary rounded-top">rounded-top</div>
  <br />
  <div class="bg-light border border-primary rounded-bottom">rounded-bottom</div>
  <br />
  <div class="bg-light border border-primary rounded-start">rounded-start</div>
  <br />
  <div class="bg-light border border-primary rounded-end">rounded-end</div>
  <br />
  <div class="bg-light border border-primary rounded-circle">rounded-circle</div>
  <br />
  <div class="bg-light border border-primary rounded-pill">rounded-pill</div>

5. 圆角边框角度 (Sizes)

rounded-N N 介于 0 – 3

  <div class="bg-light border border-primary rounded ">rounded</div>
  <br />
  <div class="bg-light border border-primary rounded-0">rounded-0</div>
  <br />
  <div class="bg-light border border-primary rounded-1">rounded-1</div>
  <br />
  <div class="bg-light border border-primary rounded-2">rounded-2</div>
  <br />
  <div class="bg-light border border-primary rounded-3">rounded-3</div>