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常用的水平垂直居中方案 #24

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chaijinsong opened this issue Aug 7, 2019 · 0 comments
Open

常用的水平垂直居中方案 #24

chaijinsong opened this issue Aug 7, 2019 · 0 comments

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@chaijinsong
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  1. flex实现水平垂直居中
    适用场景:父子宽高都可未知(比较推荐这种方式,简单,而且目前兼容性也不错。)
<html>
  <head>
    <style>
      .parent {
          width: 100%;
          height: 100px;
          background: cyan;
          display: flex;
          justify-content: center;
          align-items: center;
        }
        .son {
          width: 20%;
          height: 20%;
          background: pink;
        }
    </style>
  </head>
  <body>
    <div class='parent'>
       <div class='son'></div>
    </div>
  </body>
</html>
  1. 绝对定位加上负margin
    适用场景:父元素宽高已知未知都行,但是首先得有宽高。其次子元素的宽高必须已知,因为需要设置子元素的负margin. (也可以将负margin设置成translate来做位移实现)
<html>
  <head>
      <style>
      .parent {
          position: relative;
          width: 200px;
          height: 200px;
          background: pink;
        }
        .son {
          position: absolute;
          left: 50%;
          top: 50%;
          margin-left: -25px;
          margin-top: -25px;
          width: 50px;
          height: 50px;
          background: yellow;
        }
      </style>
  </head>
  <body>
    <div class='parent'>
       <div class='son'></div>
    </div>
  </body>
</html>
  1. 绝对定位 + auto margin
    适用场景:父子元素宽高都未知的情况(该方式不需要明确知道子元素宽高,子元素宽高可用百分比,对于子元素宽高不确定需要居中的情况比较适合。)
<html>
  <head>
    <style>
      .parent {
          position: relative;
          width: 200px;
          height: 200px;
          background: cyan;
        }
        .son {
          position: absolute;
          left: 0;
          top: 0;
          bottom: 0;
          right: 0;
          margin: auto;
          width: 10%;
          height: 10%;
          background: yellow;
        }
    </style>
  </head>
  <body>
    <div class='parent'>
       <div class='son'></div>
    </div>
  </body>
</html>
  1. 网格布局
    适用场景:父子元素宽高未知,兼容性不大好
<html>
  <head>
    <style>
      .parent {
          display: grid;
      }
      .son {
        jusitify-self: center;
        align-self: center;
      }
    </style>
  </head>
    <body>
      <div class='parent'>
       <div class='son'></div>
    </div>
    </body>
</html>
  1. Table-cell + text-align + vertical-align
    适用场景: 父元素大小已知(非百分比高度),子元素大小未知,但子元素须为行内块元素,较好的兼容性
<html>
  <head>
    <style>
      .parent {
          display: table-cell;
          vertical-align: middle;
          text-align: center;
          width: 100vw;
          height: 90vh;
          background-color: yellowgreen;
        }
        .son {
          display: inline-block;
          width: 200px;
          height: 200px;
          background-color: Indigo;
        }
    </style>
  </head>
  <body>
    <div class='parent'>
       <div class='son'></div>
    </div>
  </body>
</html>
  1. 伪元素
    适用场景:父子宽高都可未知,子元素需为行内块元素(这种方式其实就是使用伪元素的高度为100%,子元素和伪元素都设置 vertical-align: middle实现垂直居中的效果)
<html>
  <head>
    <style>
    .parent {
      height: 100vh;
      width: 100vw;
      text-align: center;
      background: #c0c0c0;
    }
     
    .parent:before {
      content: "\200B";
      display: inline-block;
      height: 100%;
      vertical-align: middle;
    }
     
    .son {
      display: inline-block;
      vertical-align: middle;
      width: 200px;
      height: 200px;
      padding: 10px 15px;
      background: #f5f5f5;
    }
    </style>
  </head>
  <body>
    <div class="parent">
      <div class="son"></div>
    </div>
  </body>
</html>
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