css怎么让按钮平均分布

css怎么让按钮平均分布

等分布局是指子元素平均分配父元素宽度的布局方式，本文将介绍实现等分布局的4种方式

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

（相关课程推荐：css视频教程）

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>

2. 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>

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="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. 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>   
  
XML/HTML Code复制内容到剪贴板
<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. inline-block + margin + (fix)

<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="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>

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>   
  
XML/HTML Code复制内容到剪贴板
<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>

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>   
  
<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>

四、flex

<style>   
body,p{margin: 0;}   
.parent{   
    display: flex;   
}   
.child{   
    flex:1;   
    height: 100px;   
}   
.child + .child{   
    margin-left: 20px;   
}   
</style>   
  
XML/HTML Code复制内容到剪贴板
<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>

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