15.使div 水平垂直居中

roxy0724 commented 5 years ago

尽可能写多的实现方案

zlx362211854 commented 5 years ago

水平垂直居中有多种方案实现。

使用position实现

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <style>
    * {
      margin: 0;
      padding: 0
    }
    html,body{
      width: 100%;
      height: 100%;
    }
    body {
      position: relative;
    }
    .box {
      width: 200px;
      height: 200px;
      background-color: aquamarine;
      position: absolute;
      left: 50%;
      top: 50%;
      margin-top: -100px;
      margin-left: -100px;
    }
  </style>
</head>
<body>
  <div class="box"></div>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <style>
    * {
      margin: 0;
      padding: 0
    }
    html,body{
      width: 100%;
      height: 100%;
    }
    body {
      position: relative;
    }
    .box {
      width: 200px;
      height: 200px;
      background-color: aquamarine;
      position: absolute;
      margin: auto;
      top: 0; left: 0; bottom: 0; right: 0;
    }
  </style>
</head>
<body>
  <div class="box"></div>
</body>
</html>

使用flex实现

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <style>
    * {
      margin: 0;
      padding: 0
    }
    html,body{
      width: 100%;
      height: 100%;
    }
    body {
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .box {
      width: 200px;
      height: 200px;
      background-color: rgb(11, 77, 55);
    }
  </style>
</head>
<body>
  <div class="box"></div>
</body>
</html>

使用transform

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <style>
    * {
      margin: 0;
      padding: 0
    }
    html,body{
      width: 100%;
      height: 100%;
    }
    .box {
      width: 200px;
      height: 200px;
      background-color: aquamarine;
      position: relative;
      left: 50%;
      top: 50%;
      transform: translate(-50%,-50%)
    }
  </style>
</head>
<body>
  <div class="box"></div>
</body>
</html>

goldEli commented 5 years ago

flex

<style>
    .box{
      width: 200px;
      height: 200px;
      border: 1px solid red;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .innerBox{
      width: 50px;
      height: 50px;
      background-color: brown;
    }
</style>
<body>
    <div class="box">
      <div class="innerBox">

      </div>
    </div>
</body>

position + margin

<style>
    .box{
      width: 200px;
      height: 200px;
      border: 1px solid red;
      position: relative;
    }
    .innerBox{
      width: 50px;
      height: 50px;
      background-color: brown;
      position: absolute;
      top: 50%;
      left: 50%;
      margin: -25px 0 0 -25px;
    }
</style>
<body>
    <div class="box">
      <div class="innerBox"></div>
    </div>
</body>

position + transform

<style>
    .box{
      width: 200px;
      height: 200px;
      border: 1px solid red;
      position: relative;
    }
    .innerBox{
      width: 50px;
      height: 50px;
      background-color: brown;
      position:absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%)
    }
</style>
<body>
    <div class="box">
      <div class="innerBox"></div>
    </div>
</body>

roxy0724 commented 5 years ago

flex

<style>
.content{
    width: 100px;
    height: 100px;
    background: #ccc;
}
.box {
    height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
}
</style>
<body>
<div class="box">
    <div class="content"></div>
</div>
</body>

2.绝对定位、负边距

<style>
    .box {
        position: relative;
        height: 500px;
    }
    .content {
        position: absolute;
        width: 100px;
        height: 100px;
        background: #cccccc;
        top: 50%;
        left: 50%;
        margin: -50px 0 0 -50px;
    }
</style>

3.table-cell(仅适用于inline或inline-block元素)

<style>
    .box {
        display: table-cell;
        text-align: center;
        vertical-align: middle;
        height: 500px;
        width: 500px;
    }
</style>

4.transform

<style>
    .content{
        position: relative;
        height: 500px;
    }
    .box {
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%,-50%);
    }
</style>

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