CSS实现等分布局的4种方式
思路一: float
缺点:结构和样式存在耦合性，IE7-浏览器下对宽度百分比取值存在四舍五入的误差
【1】float + padding + background-clip
使用padding来实现子元素之间的间距，使用background-clip使子元素padding部分不显示背景
<style>
body,p{margin: 0;}
.parentWrap{
overflow: hidden;
}
.parent{
margin-right: -20px;
overflow: hidden;
}
.child{
float: left;
height: 100px;
width: 25%;
padding-right: 20px;
box-sizing: border-box;
background-clip: content-box;
}
</style>
<div class="parentWrap">
<div class="parent" style="background-color: lightgrey;">
<div class="child" style="background-color: lightblue;">1</div>
<div class="child" style="background-color: lightgreen;">2</div>
<div class="child" style="background-color: lightsalmon;">3</div>
<div class="child" style="background-color: pink;">4</div>
</div>
</div>
【2】float + margin + calc
使用margin实现子元素之间的间距，使用calc()函数计算子元素的宽度
<style>
body,p{margin: 0;}
.parentWrap{
overflow: hidden;
}
.parent{
overflow: hidden;
margin-right: -20px;
}
.child{
float: left;
height: 100px;
width: calc(25% - 20px);
margin-right: 20px;
}
</style>
<div class="parentWrap">
<div class="parent" style="background-color: lightgrey;">
<div class="child" style="background-color: lightblue;">1</div>
<div class="child" style="background-color: lightgreen;">2</div>
<div class="child" style="background-color: lightsalmon;">3</div>
<div class="child" style="background-color: pink;">4</div>
</div>
</div>
【3】float + margin + (fix)
使用margin实现子元素之间的间距，通过增加结构来实现兼容
<style>
body,p{margin: 0;}
.parentWrap{
overflow: hidden;
}
.parent{
overflow: hidden;
margin-right: -20px;
}
.child{
float: left;
width: 25%;
}
.in{
margin-right: 20px;
height: 100px;
}
</style>
<div class="parentWrap">
<div class="parent" style="background-color: lightgrey;">
<div class="child" style="background-color: blue;">
<div class="in" style="background-color: lightblue;">1</div>
</div>
<div class="child" style="background-color: green;">
<div class="in" style="background-color: lightgreen;">2</div>
</div>
<div class="child" style="background-color: orange;">
<div class="in" style="background-color: lightsalmon;">3</div>
</div>
<div class="child" style="background-color: red;">
<div class="in" style="background-color: pink;">4</div>
</div>
</div>
</div>
思路二: inline-block
缺点：需要设置垂直对齐方式vertical-align，则需要处理换行符解析成空格的间隙问题。IE7-浏览器不支持给块级元素设置inline-block属性，兼容代码是display:inline;zoom:1;
【1】inline-block + padding + background-clip
<style>
body,p{margin: 0;}
.parentWrap{
overflow: hidden;
}
.parent{
font-size: 0;
margin-right: -20px;
overflow: hidden;
}
.child{
display:inline-block;
vertical-align: top;
width: 25%;
padding-right: 20px;
box-sizing: border-box;
background-clip: content-box;
font-size: 16px;
}
</style>
<div class="parentWrap">
<div class="parent" style="lightgrey;">
<div class="child" style="lightblue;">1</div>
<div class="child" style="lightgreen;">2</div>
<div class="child" style="lightsalmon;">3</div>
<div class="child" style="pink;">4</div>
</div>
</div>
【2】inline-block + margin + calc
<style>
body,p{margin: 0;}
.parentWrap{
overflow: hidden;
}
.parent{
margin-right: -20px;
font-size: 0;
}
.child{
display: inline-block;
vertical-align: top;
font-size: 16px;
height: 100px;
width: calc(25% - 20px);
margin-right: 20px;
}
</style>
<div class="child" style="lightblue;">1</div>
<div class="child" style="lightgreen;">2</div>
<div class="child" style="lightsalmon;">3</div>
<div class="child" style="pink;">4</div>
</div>
</div>
【3】inline-block + margin + (fix)
CSS Code复制内容到剪贴板
<style>
body,p{margin: 0;}
.parentWrap{
overflow: hidden;
}
.parent{
margin-right: -20px;
font-size: 0;
}
.child{
display: inline-block;
vertical-align: top;
font-size: 16px;
width: 25%;
}
.in{
margin-right: 20px;
height: 100px;
}
</style>
<div class="parentWrap">
<div class="parent" style="lightgrey;">
<div class="child" style="blue;">
<div class="in" style="lightblue;">1</div>
</div>
<div class="child" style="green;">
<div class="in" style="lightgreen;">2</div>
</div>
<div class="child" style="orange;">
<div class="in" style="lightsalmon;">3</div>
</div>
<div class="child" style="red;">
<div class="in" style="pink;">4</div>
</div>
</div>
</div>
思路三: table
缺点：元素被设置为table后，内容撑开宽度。若要兼容IE7-浏览器，需要改为<table>结构。table-cell元素无法设置margin，设置padding及background-clip也不可行
【1】table + margin负值
<style>
body,p{margin: 0;}
.parentWrap{
overflow: hidden;
}
.parent{
display: table;
width: calc(100% + 20px);
table-layout: fixed;
}
.child{
display: table-cell;
height: 100px;
padding-right: 20px;
}
</style>
<div class="parentWrap">
<div class="parent" style="lightgrey;">
<div class="child" style="blue;">
<div class="in" style="lightblue;">1</div>
</div>
<div class="child" style="green;">
<div class="in" style="lightgreen;">2</div>
</div>
<div class="child" style="orange;">
<div class="in" style="lightsalmon;">3</div>
</div>
<div class="child" style="red;">
<div class="in" style="pink;">4</div>
</div>
</div>
</div>
【2】table + 兄弟选择器
<style>
body,p{margin: 0;}
.parent{
display: table;
width: 100%;
table-layout: fixed;
}
.child{
display: table-cell;
height: 100px;
}
.child + .child{
padding-left: 20px;
}
</style>
XML/HTML Code复制内容到剪贴板
<div class="parent" style="lightgrey;">
<div class="child" style="blue;">
<div class="in" style="lightblue;">1</div>
</div>
<div class="child" style="green;">
<div class="in" style="lightgreen;">2</div>
</div>
<div class="child" style="orange;">
<div class="in" style="lightsalmon;">3</div>
</div>
<div class="child" style="red;">
<div class="in" style="pink;">4</div>
</div>
</div>
思路四: flex
<style>
body,p{margin: 0;}
.parent{
display: flex;
}
.child{
flex:1;
height: 100px;
}
.child + .child{
margin-left: 20px;
}
</style>
<div class="parent" style="lightgrey;">
<div class="child" style="lightblue;">1</div>
<div class="child" style="lightgreen;">2</div>
<div class="child" style="lightsalmon;">3</div>
<div class="child" style="pink;">4</div>
</div>
