本文主要取自于网易云课堂——前端微专业 页面制作
github相关代码：https://github.com/Mirror1988...

??布局解决方案

居中布局

水平居中

父元素与子元素宽度不定

<div class="parent1 parent">
  <div class="child1 child">demo</div>
</div>

inline-block + text-align

.parent1{text-align: center;}
.child1{display: inline-block;}

table + margin

.parent2{}
.child2{display: table;margin:0 auto;}

absolute + transform

.parent3{position: relative;}
.child3{position: absolute;left:50%;transform: translateX(-50%);}

flex + justify-content

.parent4{display:flex;justify-content:center;}

垂直居中

父元素与子元素高度不定

table-cell + vertical-align

.parent5{display: table-cell;vertical-align: middle;}

absolute + tranform

.parent6{position: relative;}
.child6{position: absolute;transform: translateY(-50%);top:50%;}

flex + align-items

.parent7{display: flex;align-items:center;}

水平垂直居中

inline-block + text-align + table-cell + vertical-align

.parentT{height:200px;background-color: #ccc;width:500px;}
.parent8{text-align: center;display: table-cell;vertical-align: middle;}
.child8{display: inline-block;}

absolute + transform

.parent9{position: relative;}
.child9{position: absolute;transform: translate(-50%,-50%);top:50%;left:50%;}

flex + justify-content + align-items

.parent10{display: flex;align-items: center;justify-content: center;}

多列布局

定宽+自适应

<div class="parent1 parent">
  <div class="left1 left">left</div>
  <div class="right1 right">
    <p>right</p>
    <p>right</p>
    <p>right</p>
  </div>
</div>

float + margin （问题：左侧浮动脱离文档流）

.left1{float:left;width:100px;}
.right1{margin-left: 120px}

float + overflow （问题：左侧浮动脱离文档流）

.left2{float:left;width: 100px}
.right2{overflow:hidden;}

table (可实现左右等高)

.left3{display: table-cell;width:100px;table-layout: fixed;}
.right3{display: table-cell}

flex (可实现左右等高)

.parent4{display: flex}
.left4{width:100px;margin-right: 10px}
.right4{flex:1;}

不定宽+自适应

float + overflow

.left5{float:left;}
.right5{overflow:hidden;}

table

.parent6{display: table;width: 100%}
.left6{display: table-cell;width:0.1%;}
.right6{display: table-cell}

flex

.parent7{display: flex}
.left7{margin-right: 10px}
.right7{flex:1;}

等分布局

<div class="parent8 parent clearfix">
  <div class="column8 column"><p>column</p></div>
  <div class="column8 column"><p>column</p></div>
  <div class="column8 column"><p>column</p></div>
  <div class="column8 column"><p>column</p></div>
</div>

float

并不理想

.parent8{margin-left: -20px;}
.column8{float:left;width:25%;padding-right:20px;box-sizing: border-box;}

flex

.parent9{display: flex}
.column9{flex:1;}
.column9+.column9{margin-left:20px;}

等高布局

table

.parent10{display: table;width: 100%;table-layout: fixed}
.left10{display: table-cell;width: 100px;}
.right10{display: table-cell}

flex

.parent11{display: flex}
.left11{margin-right: 10px}
.right11{flex:1;}

float

.parent12{overflow: hidden;}
.left12{float:left;margin-right: 10px}
.right12{overflow: hidden}
.left12,.right12{padding-bottom:9999px;margin-bottom: -9999px}

全屏布局

position

<div class="wrap">
  <div class="parent1 parent">
    <div class="top1 top">top</div>
    <div class="left1 left">left</div>
    <div class="right1 right">
      <div style="height:1000px;width:2000px"><p>bottom</p><p>bottom</p><p>bottom</p><p>bottom</p><p>bottom</p><p>bottom</p>                      <p>bottom</p><p>bottom</p><p>bottom</p></div>
    </div>
    <div class="bottom1 bottom">bottom</div>
  </div>
</div>

.wrap{width:95%;height:500px;border:2px dashed #333;margin:0 auto;color:#fff;}
.parent{width:100%;height:100%;}
.top{height:50px;background-color: #ccc}
.bottom{height:50px;background-color: #ccc}
.left{background-color: #cf1200}
.right{background-color: #4a7fc0;overflow: auto}
.parent1{position: relative;}
.top1{position: absolute;top:0;left:0;right: 0}
.bottom1{position: absolute;bottom:0;left:0;right: 0}
.left1{position: absolute;width:100px;top:50px;bottom:50px;}
.right1{position: absolute;top:50px;bottom:50px;left:100px;right: 0}

flex

<div class="wrap">
  <div class="parent2 parent">
    <div class="top2 top">top</div>
    <div class="middle2">
      <div class="left2 left">left 200px</div>
      <div class="right2 right">
        <div style="height:1000px;width:2000px"><p>bottom</p><p>bottom</p><p>bottom</p><p>bottom</p><p>bottom</p><p>bottom</p><p>bottom</p><p>bottom</p><p>bottom</p></div>
      </div>
    </div>
    <div class="bottom2 bottom">bottom</div>
  </div>
</div>

/*flex*/
.parent2{display: flex;flex-direction: column;}
.middle2{flex:1;display: flex}
.left2{width: 200px;}
.right2{flex:1;}

vh

通过vh单位也可实现全屏布局

flex

通过flex可以实现上述布局

Flex布局