我有一个简单的flex-box布局的容器，如:
.grid {
display: flex;
flex-flow: row wrap;
justify-content: space-between;
}
现在我想让最后一行中的项目与其他项目对齐。justify-content:之间的空间;应使用，因为网格的宽度和高度是可以调节的。
目前看来
在这里，我希望右下角的项目在“中间一列”中。最简单的方法是什么?下面是一个展示这种行为的小jsfiddle。
.exposegrid {
display: flex;
flex-flow: row wrap;
justify-content: space-between;
}
.exposetab {
width: 100px;
height: 66px;
background-color: rgba(255, 255, 255, 0.2);
border: 1px solid rgba(0, 0, 0, 0.4);
border-radius: 5px;
box-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
margin-bottom: 10px;
}
<div class="exposegrid">
<div class="exposetab"></div>
<div class="exposetab"></div>
<div class="exposetab"></div>
<div class="exposetab"></div>
<div class="exposetab"></div>
<div class="exposetab"></div>
<div class="exposetab"></div>
<div class="exposetab"></div>
<div class="exposetab"></div>
<div class="exposetab"></div>
<div class="exposetab"></div>
<div class="exposetab"></div>
<div class="exposetab"></div>
<div class="exposetab"></div>
</div>
这里有一些解决方案，人们建议编写精确的布局css类，使用伪元素伪造最后一项，使用非flexbox方法等。
一个大问题是邻居之间的间隙(大小写对齐的按钮包装到多行)。在这种情况下，你不希望物品相互接触，就需要有空隙。我只是想添加一个适当的解决方案，尊重差距，并适用于任何数量的项目。它也是基于假的最后一个元素的想法，但更普遍。有关详细信息，请参阅代码片段注释。
html {
font-size: 1px;
}
.container {
font-size: 16rem;
display: flex;
flex-wrap: wrap;
justify-content: space-between;
}
.item {
background-color: orange;
border-radius: 10rem;
box-sizing: border-box;
color: white;
margin-bottom: 10rem;
padding: 15rem 10rem;
text-align: center;
}
<!--
Our setup from design (example) used later in calculations:
container-width: 100%; (can be any)
max-per-row = 4;
total = 6;
desired-hor-gap = 10rem; (equal to vert. gap)
If you go dynamic (drawing html according to the coming data either in a backend template or in a frontend template), you have to calculate and then set exact properties inline.
<i> (or any real html element) is needed to set inline styles to arrange the last row properly.
"2" in <i> calc function - is 6 % 4 since calc doesn't allow for "%" operator. But in real life you will calculate these numbers in JS or some backend template anyway.
Formulas written in elements' calc functions. Seem to be self-descriptive, but the idea is to set for the last fake item the remainder width + hypothetical gaps.
-->
<div class="container">
<div style="flex: 0 1 calc((100% - (4 - 1) * 10rem) / 4);" class="item">do stuff</div>
<div style="flex: 0 1 calc((100% - (4 - 1) * 10rem) / 4);" class="item">do stuff</div>
<div style="flex: 0 1 calc((100% - (4 - 1) * 10rem) / 4);" class="item">do stuff</div>
<div style="flex: 0 1 calc((100% - (4 - 1) * 10rem) / 4);" class="item">do stuff</div>
<div style="flex: 0 1 calc((100% - (4 - 1) * 10rem) / 4);" class="item">do stuff</div>
<div style="flex: 0 1 calc((100% - (4 - 1) * 10rem) / 4);" class="item">do stuff</div>
<i style="flex: 0 1 calc((100% - (4 - 1) * 10rem) / 4 * (4 - 2) + ( 4 - 2 - 1) * 10rem);"></i>
</div>
