如果你想在网格视图中对齐项目，即使是最后一个元素。确保卡片宽度为100% 使用下面的css。效果很好

.container {
  /* ... snip ... */
  display: grid;
  grid-template-columns: repeat(auto-fill, 100px);
  justify-content: space-between;
  grid-gap: 20px;
}

使用flexbox和一些媒体查询，我做了这个小小的变通:http://codepen.io/una/pen/yNEGjv(它有点俗气，但有效):

.container {
  display: flex;
  flex-flow: row wrap;
  justify-content: flex-start;
  max-width: 1200px;
  margin: 0 auto;
}

.item {
  background-color: gray;
  height: 300px;
  flex: 0 30%;
  margin: 10px;

  @media (max-width: 700px) {
     flex: 0 45%;
  }

  @media (max-width: 420px) {
    flex: 0 100%;
  }

  &:nth-child(3n-1) {
    margin-left: 10px;
    margin-right: 10px;
  }
}

我为它做了一个SCSS mixin。

@mixin last-row-flexbox($num-columns, $width-items){

  $filled-space: $width-items * $num-columns;
  $margin: calc((100% - #{$filled-space}) / (#{$num-columns} - 1));

  $num-cols-1 : $num-columns - 1;

  &:nth-child(#{$num-columns}n+1):nth-last-child(-n+#{$num-cols-1}) ~ & {
    margin-left: $margin;
  }
  @for $i from 1 through $num-columns - 2 { 
    $index: $num-columns - $i;
    &:nth-child(#{$num-columns}n+#{$index}):last-child{
      margin-right: auto;
    }
  }
}

这是代码依赖的链接:http://codepen.io/diana_aceves/pen/KVGNZg

你只需要设置项目的宽度百分比和列数。

我希望这能帮助到你。

你不能。Flexbox不是一个网格系统。它没有实现您所要求的功能的语言结构，至少在使用justify-content: space between时是这样。使用Flexbox最接近的方法是使用列方向，这需要设置显式的高度:

http://cssdeck.com/labs/pvsn6t4z(注:不包括前缀)

ul {
  display: flex;
  flex-flow: column wrap;
  align-content: space-between;
  height: 4em;
}

然而，只使用列会更简单，它有更好的支撑，不需要设置特定的高度:

http://cssdeck.com/labs/dwq3x6vr(注:不包括前缀)

ul {
  columns: 15em;
}

如果你想让最后一项与网格对齐，请使用以下代码:

网格容器

.card-grid {
  box-sizing: border-box;
  max-height: 100%;
  display: flex;
  flex-direction: row;
  -webkit-box-orient: horizontal;
  -webkit-box-direction: normal;
  justify-content: space-between;
  align-items: stretch;
  align-content: stretch;
  -webkit-box-align: stretch;
  -webkit-box-orient: horizontal;
  -webkit-box-direction: normal;
  -ms-flex-flow: row wrap;
  flex-flow: row wrap;
}

.card-grid:after {
  content: "";
  flex: 1 1 100%;
  max-width: 32%;
}

网格中的项

.card {
  flex: 1 1 100%;
  box-sizing: border-box;
  -webkit-box-flex: 1;
  max-width: 32%;
  display: block;
  position: relative;

}

诀窍是将项目的max-width设置为.card-grid的max-width:after。

Codepen上的现场演示

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>