css布局:如何实现垂直居中?

zuncle 2019-11-08

css布局:如何实现垂直居中?

1.利用line-height实现居中,这种方法适合纯文字类的;

css布局:如何实现垂直居中?

<!-- css -->
<style>
.parents {
  height: 400px;
  line-height: 400px;
  width: 400px;
  border: 1px solid red;
  text-align: center;
}

.child {
  background-color: blue;
  color: #fff;
}
 </style>
</head>

<body>
<!-- html -->
<div class="parents">
   <span class="child">css布局,实现垂直居中</span>
</div>
</body>

2.通过设置父容器相对定位,子级设置绝对定位,标签通过margin实现自适应居中;

css布局:如何实现垂直居中?

<!-- css -->
<style>
.parents {
  height: 400px;
  width: 400px;
  border: 1px solid red;
  position: relative;
}

.child {
  width: 200px;
  height: 100px;
  line-height: 100px;
  text-align: center;
  color: #fff;
  background-color: blue;
  /* 四个方向设置为0, 然后通过margin为auto自适应居中 */
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  margin: auto;
}
 </style>
</head>

<body>
<!-- html -->
<div class="parents">
  <span class="child">css布局,实现垂直居中</span>
</div>
</body>

3.弹性布局flex 父级设置display: flex; 子级设置margin为auto实现自适应居中;

css布局:如何实现垂直居中?

<!-- css -->
  <style>
    .parents {
      height: 400px;
      width: 400px;
      border: 1px solid red;
      display: flex;
    }

    .child {
      width: 200px;
      height: 100px;
      line-height: 100px;
      text-align: center;
      color: #333;
      background-color: yellow;
      margin: auto;
  }
 </style>
</head>

<body>
 <!-- html -->
  <div class="parents">
    <span class="child">css布局,实现垂直居中</span>
  </div>
</body>

4. 父级设置相对定位,子级设置绝对定位,并且通过位移transform实现;

css布局:如何实现垂直居中?

<!-- css -->
  <style>
    .parents {
      height: 400px;
      width: 400px;
      border: 1px solid red;
      position: relative;
    }

    .child {
      width: 200px;
      height: 100px;
      line-height: 100px;
      text-align: center;
      color: #fff;
      background-color: green;
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
    }
  </style>
</head>

<body>
  <!-- html -->
  <div class="parents">
    <span class="child">css布局,实现垂直居中</span>
  </div>
</body>

5. 父级设置弹性盒子,并设置弹性盒子相关属性;

css布局:如何实现垂直居中?

<!-- css -->
 <style>
    .parents {
      height: 400px;
      width: 400px;
      border: 1px solid red;
      display: flex;
      justify-content: center; /* 水平 */
      align-items: center; /* 垂直 */
    }

    .child {
      width: 200px;
      height: 100px;
      color: black;
      background-color: orange;
    }
  </style>
</head>

<body>
  <!-- html -->
  <div class="parents">
    <span class="child"></span>
  </div>
</body>

6. 网格布局,父级通过转换成表格形式,然后子级设置行内或行内块实现。(需要注意的是:vertical-align: middle使用的前提条件是内联元素以及display值为table-cell的元素)。

css布局:如何实现垂直居中?

<!-- css -->
 <style>
    .parents {
      height: 400px;
      width: 400px;
      border: 1px solid red;
      display: table-cell;
      text-align: center;
      vertical-align: middle;
    }

    .child {
      width: 200px;
      height: 100px;
      color: #fff;
      background-color: blue;
      display: inline-block; /* 子元素设置行内或行内块 */
    }
  </style>
</head>

<body>
  <!-- html -->
  <div class="parents">
    <span class="child"></span>
  </div>
</body>

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