Flex的使用场景

时间 2020-06-23 标签 flex 使用场景

1.固定宽度

代码实现（某一侧固定，另外一侧自适应）：html

<!DOCTYPE html>
<html>
<head>
  <title>Flex布局-一侧固定，另外一侧自适应</title>
  <style>
    .parent {
      display: flex;
      width: 500px;
      height: 200px;
    }
    .left {
      width: 100px;
      background: #f00;
    }
    .right {
      flex: 1;
      background: orange;
    }
  </style>
</head>
<body>
  <div class="parent">
    <div class="left"></div>
    <div class="right"></div>
  </div>
</body>
</html>

代码实现（两侧固定，中间自适应）：布局

<!DOCTYPE html>
<html>
<head>
  <title>Flex布局-左右两边固定，中间自适应</title>
  <style>
    .parent {
      display: flex;
      width: 500px;
      height: 200px;
    }
    .left {
      width: 50px;
      background: #f00;
    }
    .center {
      flex: 1;
      background: orange;
    }
    .right {
      width: 50px;
      background: #f00;
    }
  </style>
</head>
<body>
  <div class="parent">
    <div class="left"></div>
    <div class="center"></div>
    <div class="right"></div>
  </div>
</body>
</html>

2.子元素等分

<!DOCTYPE html>
<html>
<head>
  <title>Flex布局-左右两边固定，中间自适应</title>
  <style>
    .parent {
      display: flex;
      width: 500px;
      height: 200px;
    }
    .left {
      flex: 1;
      height: 200px;
      background: #f00;
    }
    .center {
      flex: 1;
      height: 200px;
      background: orange;
    }
    .right {
      flex: 1;
      height: 200px;
      background: #f00;
    }
  </style>
</head>
<body>
  <div class="parent">
    <div class="left"></div>
    <div class="center"></div>
    <div class="right"></div>
  </div>
</body>
</html>

3.子元素对齐

<!DOCTYPE html>
<html>
<head>
  <title>Flex布局-左右两边固定，中间自适应</title>
  <style>
    .parent {
      display: flex;
      justify-content: center;
      align-items: center;
      width: 500px;
      height: 200px;
      background: yellow;
    }
    .child {
      height: 50px;
      width: 50px;
    }
    .left {
      background: #f00;
    }
    .center {
      background: orange;
    }
    .right {
      background: #f00;
    }
  </style>
</head>
<body>
  <div class="parent">
    <div class="child left"></div>
    <div class="child center"></div>
    <div class="child right"></div>
  </div>
</body>
</html>