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四分.html
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<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<style>
/*<!--假设此盒子宽高为400px-->*/
.box {
margin: 100px auto;
width: 400px;
height: 400px;
position: relative;
background-color: #ccc;
}
/*方案一，利用伪类,此方法只给演示，不是用于布局*/
.demo:after, .demo:before {
content: "";
position: absolute;
background-color: #fff;
}
.demo:after {
width: 10px;
top: 0;
left: 50%;
height: 100%;
transform: translateX(-50%);
}
.demo:before {
height: 10px;
width: 100%;
top: 50%;
left: 0;
transform: translateY(-50%);
}
/*方案一 table 此方法在高度存在不能平分高度的缺陷。如果高度不固定的情况。下面的每个div，由于table的特性。高度只能跟随内容高度来高*/
.table {
display: table;
table-layout: fixed;
height: auto;
text-align: center;
vertical-align: middle;
}
.table-row {
display: table-row;
}
.table-row > div {
display: table-cell;
width: 50%;
background-color: blue;
background-clip: content-box;
padding-right: 5px;
padding-top: 5px;
}
.table .table-row:first-child > div {
padding-top: 0px;
padding-bottom: 5px;
}
.table-row div:nth-child(2n) {
padding-left: 5px;
padding-right: 0;
}
/*方案二 flex 此方法在高度上完全可以平分高度，但在移动端还是flex的兼容性问题存在*/
.flex {
display: flex;
flex-wrap: wrap;
}
.flex > div {
background-color: blue;
width: 50%;
box-sizing: border-box;
padding-right: 5px;
padding-bottom: 5px;
background-clip: content-box;
}
.flex div:nth-child(even) {
padding-left: 5px;
padding-right: 0;
}
.flex div:last-child, .flex div:nth-child(3) {
padding-top: 5px;
padding-bottom: 0;
}
/*方案三 float 此方法一样，在高度上也能平分*/
.float div {
float: left;
width: 50%;
background-color: blue;
padding-left: 5px;
padding-bottom: 5px;
box-sizing: border-box;
height: 50%;
background-clip: content-box;
}
.float div:nth-child(odd) {
padding-right: 5px;
padding-left: 0;
}
.float div:last-child, .float div:nth-child(3) {
padding-top: 5px;
padding-bottom: 0;
}
/*absolute 纯属娱乐*/
.absolute div {
position: absolute;
width: 50%;
height: 50%;
background-color: blue;
padding-right: 5px;
padding-bottom: 5px;
background-clip: content-box;
box-sizing: border-box;
}
.absolute div:nth-child(2n) {
left: 50%;
padding-left: 5px;
padding-right: 0;
}
.absolute div:last-child, .absolute div:nth-child(3) {
top: 50%;
padding-top: 5px;
padding-bottom: 0;
}
</style>
</head>
<body>
<h3>演示，非布局</h3>
<div class="box demo"></div>
<h3>table布局，问题：不能高度自适应</h3>
<div class="box table">
<div class="table-row">
<div>1</div>
<div>2</div>
</div>
<div class="table-row">
<div>3</div>
<div>4</div>
</div>
</div>
<h3>flex布局宽度和高度都能自适应。使用了伪类选择器</h3>
<div class="box flex">
<div>1</div>
<div>2</div>
<div>3</div>
<div>4</div>
</div>
<h3>float布局宽度和高度都能自适应。使用了伪类选择器</h3>
<div class="box float">
<div>1</div>
<div>2</div>
<div>3</div>
<div>4</div>
</div>
<h3>absolute布局。纯属娱乐</h3>
<div class="box absolute">
<div>1</div>
<div>2</div>
<div>3</div>
<div>4</div>
</div>
<h3>还可以有tranform:translate方法，position:relative方法</h3>
</body>
</html>