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

如果各个子项具有显式的宽度(例如;32%)，你可以通过在父元素中添加:after元素并给出相同的显式宽度来解决这个问题。

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。

添加一个::之后自动填充空间。不需要污染你的HTML。下面是一个代码依赖体:http://codepen.io/DanAndreasson/pen/ZQXLXj

.grid {
  display: flex;
  flex-flow: row wrap;
  justify-content: space-between;
}

.grid::after {
  content: "";
  flex: auto;
}

我修改了Dan Andreasson给出的示例，在元素上使用右边框来创建一个伪gutter。然后，您可以使用第n -child删除所需列网格计数的最后一个子节点上的边框。这里是一个演示https://codepen.io/JacobLett/pen/mdVoroM

/* demo only */ body { margin:0; padding:0; max-width:1024px; margin:0 auto; } .block-list { background: #ccc; border:1px solid #ccc; } .block-list .block-list__item { background: #eee; } /* demo only */ .block-list .block-list__item { min-height: 100px; margin-bottom: 1rem; } @media only screen and (min-width: 900px) { .block-list { display: -webkit-box; display: flex; flex-wrap: wrap; -webkit-box-pack: justify; justify-content: space-between; background-color: #ffffff; margin: 1em auto; } .block-list:after { content: ""; -webkit-box-flex: 1; flex: auto; } .block-list__item { height: 10em; width: 25%; box-sizing: border-box; border-right: 10px solid white; } .block-list-2 .block-list__item { width: 50%; } .block-list-2 .block-list__item:nth-child(2n) { border: none; } .block-list-3 .block-list__item { width: 33.3%; } .block-list-3 .block-list__item:nth-child(3n) { border: none; } .block-list-4 .block-list__item { width: 25%; } .block-list-4 .block-list__item:nth-child(4n) { border: none; } .block-list-5 .block-list__item { width: 20%; } .block-list-5 .block-list__item:nth-child(5n) { border: none; } .block-list-6 .block-list__item { width: 16.66%; } .block-list-6 .block-list__item:nth-child(6n) { border: none; } } <h2>2 column</h2> <div class="block-list block-list-2"> <div class="block-list__item">1 </div> <div class="block-list__item">2 </div> <div class="block-list__item">3 </div> <div class="block-list__item">4 </div> <div class="block-list__item">5 </div> <div class="block-list__item">6 </div> </div> <h2>3 column</h2> <div class="block-list block-list-3"> <div class="block-list__item">1 </div> <div class="block-list__item">2 </div> <div class="block-list__item">3 </div> <div class="block-list__item">4 </div> <div class="block-list__item">5 </div> <div class="block-list__item">6 </div> </div> <h2>4 column</h2> <div class="block-list block-list-4"> <div class="block-list__item">1 </div> <div class="block-list__item">2 </div> <div class="block-list__item">3 </div> <div class="block-list__item">4 </div> <div class="block-list__item">5 </div> <div class="block-list__item">6 </div> </div> <h2>5 column</h2> <div class="block-list block-list-5"> <div class="block-list__item">1 </div> <div class="block-list__item">2 </div> <div class="block-list__item">3 </div> <div class="block-list__item">4 </div> <div class="block-list__item">5 </div> <div class="block-list__item">6 </div> </div> <h2>6 column</h2> <div class="block-list block-list-6"> <div class="block-list__item">1 </div> <div class="block-list__item">2 </div> <div class="block-list__item">3 </div> <div class="block-list__item">4 </div> <div class="block-list__item">5 </div> <div class="block-list__item">6 </div> </div>

没有任何额外的标记，只是添加::after为我指定列的宽度。

.grid {
  display:flex;
  justify-content:space-between;
  flex-wrap:wrap;
}
.grid::after{
  content: '';
  width: 10em // Same width of .grid__element
}
.grid__element{
  width:10em;
}

使用这样的HTML:

<div class=grid">
   <div class="grid__element"></div>
   <div class="grid__element"></div>
   <div class="grid__element"></div>
</div>