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HTML

              
                <div class="layout" id="layout">
  <div class="section clearfix">
    <h4 id="单行 inline 或 inline-block 元素">
      <a href="#单行 inline 或 inline-block 元素" class="headerlink" title="单行 inline 或 inline-block 元素"></a>
      单行文本、inline 或 inline-block 元素
    </h4>
    <h5>水平居中</h5>
    <div class="section-horizontally section-inline">
      这是水平居中的文本
    </div>
    <div class="section-horizontally section-inline-block">
      <span>星期一</span>
      <span>星期二</span>
      <span>星期三</span>
      <span>星期四</span>
    </div>
    <h5>垂直居中</h5>
    <div class="section-vertically single-line">
      <div class="padding">我是单行文本padding: 20px 0;</div>
      <div class="line-height">我是单行文本height: 63px;line-height: 63px;</div>
    </div>
  </div>
  <div class="section clearfix">
    <h4 id="固定宽高块级盒子水平垂直居中">
      <a href="#固定宽高块级盒子水平垂直居中" class="headerlink" title="固定宽高块级盒子水平垂直居中"></a>
      固定宽高块级盒子水平垂直居中
    </h4>
    <h5>方法一:absolute + 负 margin</h5>
    <div class="demo1 box">
      <div class="bg-ddd">absolute + 负 margin</div>
    </div>
    <h5>方法二:absolute + margin auto</h5>
    <div class="demo2 box">
      <div class="bg-ddd">absolute + margin auto</div>
    </div>
    <h5>方法三:absolute + calc</h5>
    <div class="demo3 box">
      <div class="bg-ddd">absolute + calc</div>
    </div>
  </div>
  
  
  <div class="section clearfix">
    <h4 id="不固定宽高块级盒子水平垂直居中">
      <a href="#不固定宽高块级盒子水平垂直居中" class="headerlink" title="不固定宽高块级盒子水平垂直居中"></a>
      不固定宽高块级盒子水平垂直居中
    </h4>
    <h5>方法一:absolute + transform</h5>
    <div class="demo4 box">
      <div class="bg-ddd">absolute + transform</div>
    </div>
    <h5>方法二:line-height + vertical-align</h5>
    <div class="demo5 box">
      <div class="bg-ddd">line-height + vertical-align</div>
    </div>
    <h5>方法三:writing-mode</h5>
    <div class="demo6 box">
      <div class="middle">
        <div class="child bg-ddd">writing-mode</div>
      </div>
    </div>
    <h5>方法四:table-cell</h5>
    <div class="demo7 box">
      <div class="bg-ddd">table-cell</div>
    </div>
    <h5>方法五:flex</h5>
    <div class="demo8 box">
      <div class="bg-ddd">flex</div>
    </div>
    <h5>方法六:grid</h5>
    <div class="demo9 box">
      <div class="bg-ddd">grid</div>
    </div>
  </div>
 
              
            
!

CSS

              
                .clearfix {
    zoom: 1;
}
.clearfix:after {
    content: '';
    display: block;
    visibility: hidden;
    width: 100%;
    height: 0;
    clear: both;
}
h5 {
  font-size: 14px;
}
ul, li {
    padding: 0;
    margin: 0;
    list-style-type: none;
}
.left {
    float: left;
}
.right {
    float: right;
}
.layout {
    color: #666;
    margin: 0 auto;
}
.section {
    margin: 25px auto;
    width: 600px;
}
.section h4 {
    margin: 15px 0;
    color: #4e4a4a;
    position: relative;
}
.section h4:before {
    content: '#';
    display: block;
    color: #41b883;
    position: absolute;
    font-size: 20px;
    line-height: 22px;
    left: -18px;
    top: 0;
}

.section-horizontally {
    text-align: center;
    border: 1px solid #ddd;
    padding: 5px 0;
}
.section-inline-block span {
    display: inline-block;
    padding:0 5px;
}
.section-block div {
    width: 300px;
    background-color: #ddd;
    margin: 0 auto;
}
.section-more-block div, .section-more-block2 div {
    width: 150px;
    background-color: #ddd;
    display: inline-block;
    margin: 5px;
}
.section-more-block2 {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-pack: center;
    -ms-flex-pack: center;
    justify-content: center;
}
.single-line div {
    border: 1px solid #ddd;
}
.single-line .padding {
    padding: 20px 0;
}
.single-line .line-height {
    height: 60px;
    line-height: 60px;
}
.multiple-line div, .multiple-line table {
    float: left;
    width: 180px;
    height: 180px;
    margin-right: 50px;
    border: 1px solid #ddd;
}
.multiple-line .vertical-align {
    display: table;
}
.multiple-line .vertical-align p {
    display: table-cell;
    vertical-align: middle;
}
.multiple-line .flex-vertical {
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    display: -webkit-flex;
    display: flex;
}
.block-vertically div {
    float: left;
    width: 120px;
    height: 120px;
    margin-right: 50px;
    border: 1px solid #ddd;
    position: relative;
}
.block-vertically p {
    background-color: #ddd;
}
.know-height p {
    position: absolute;
    top: 50%;
    height: 50px;
    margin-top: -25px;
}
.unknow-height p {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
}
.block-vertically .flexbox {
    display: flex;
    justify-content: center;
    flex-direction: column;
}
.block-vertically .unset {
    position: relative;
}
.block-vertically .unset p {
    position: absolute;
    top: 30%;
    bottom: 30%;
}
.horizontally-vertically-box div {
    width: 150px;
    height: 150px;
    margin-right: 50px;
    border: 1px solid #ddd;
    float: left;
}
.horizontally-vertically-box div p {
    background-color: #ddd;
}
.horizontally-vertically-box .know-size {
    position: relative;
}
.horizontally-vertically-box .know-size p {
    width: 100px;
    height: 100px;
    position: absolute;
    left: 50%;
    top: 50%;
    margin: -50px 0 0 -50px;
}
.horizontally-vertically-box .unknow-size {
    position: relative;
}
.horizontally-vertically-box .unknow-size p {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}
.horizontally-vertically-box .flexbox {
    display: flex;
    justify-content: center;
    align-items: center;
}
.bg-ddd {
  background-color: #ddd;
}
.box {
  height: 150px;
  border: 1px solid #ddd;
}
.demo1 {
  position: relative;
}
.demo1 div {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 100px;
  height: 100px;
  margin: -50px 0 0 -50px;
}
.demo2 {
  position: relative;
}
.demo2 div {
  width: 100px;
  height: 100px;
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  margin: auto;
}
.demo3 {
  position: relative;
}
.demo3 div {
  width: 100px;
  height: 100px;
  position: absolute;
  left: calc(50% - 50px);
  top: calc(50% - 50px);
}
.demo4 {
  position: relative;
}
.demo4 div {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}
.demo5 {
  line-height: 150px;
  text-align: center;
}
.demo5 div {
  display: inline-block;
  line-height: initial;
  vertical-align: middle;
}
.demo6 {
  width: 600px;
  writing-mode: vertical-lr;
  text-align: center;
}
.demo6 .middle {
  display: inline-block;
  writing-mode: horizontal-tb;
  text-align: center;
  width: 100%;
}
.demo6 .child {
  display: inline-block;
}
.demo7 {
  display: table-cell;
  vertical-align: middle;
  text-align: center;
  width: 600px;
}
.demo7 div {
  display: inline-block;
}
.demo8 {
  display: flex;
    align-items: center;
    justify-content: center;
}
.demo9 {
  display: grid;
}
.demo9 div {
  align-self: center;
  justify-self: center;
}
              
            
!

JS

              
                
              
            
!
999px

Console