可以使用“flex-start”手动添加页边距。它需要一些数学技巧，但绝对容易做到，并且很容易与CSS预处理器(如LESS)一起使用。

请看这个LESS mixin的例子:

.flexboxGridMixin(@columnNumber,@spacingPercent) {
  @contentPercent: 100% - @spacingPercent;
  @sideMargin: @spacingPercent/(@columnNumber*2);
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: flex-start;
  > * {
    box-sizing: border-box;
    width: @contentPercent/@columnNumber;
    margin-left: @sideMargin;
    margin-right: @sideMargin;
  }
}

然后它可以很容易地用来显示一个响应式网格布局:

ul {
  list-style: none;
  padding: 0;
  @spacing: 10%;
  @media only screen and (max-width: 499px) { .flexboxGridMixin(1,@spacing); }
  @media only screen and (min-width: 500px) { .flexboxGridMixin(2,@spacing); }
  @media only screen and (min-width: 700px) { .flexboxGridMixin(3,@spacing); }
  @media only screen and (min-width: 900px) { .flexboxGridMixin(4,@spacing); }
  @media only screen and (min-width: 1100px) { .flexboxGridMixin(5,@spacing); }
}

li {
  background: pink;
  height: 100px;
  margin-top: 20px;
}

这里有一个例子

http://codepen.io/anon/pen/YyLqVB?editors=110

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>

可以使用“flex-start”手动添加页边距。它需要一些数学技巧，但绝对容易做到，并且很容易与CSS预处理器(如LESS)一起使用。

请看这个LESS mixin的例子:

.flexboxGridMixin(@columnNumber,@spacingPercent) {
  @contentPercent: 100% - @spacingPercent;
  @sideMargin: @spacingPercent/(@columnNumber*2);
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: flex-start;
  > * {
    box-sizing: border-box;
    width: @contentPercent/@columnNumber;
    margin-left: @sideMargin;
    margin-right: @sideMargin;
  }
}

然后它可以很容易地用来显示一个响应式网格布局:

ul {
  list-style: none;
  padding: 0;
  @spacing: 10%;
  @media only screen and (max-width: 499px) { .flexboxGridMixin(1,@spacing); }
  @media only screen and (min-width: 500px) { .flexboxGridMixin(2,@spacing); }
  @media only screen and (min-width: 700px) { .flexboxGridMixin(3,@spacing); }
  @media only screen and (min-width: 900px) { .flexboxGridMixin(4,@spacing); }
  @media only screen and (min-width: 1100px) { .flexboxGridMixin(5,@spacing); }
}

li {
  background: pink;
  height: 100px;
  margin-top: 20px;
}

这里有一个例子

http://codepen.io/anon/pen/YyLqVB?editors=110

假设:

你想要4列网格布局与包装 项目的数量不一定是4的倍数

除了第1、5、9项以外，在每一项上都设置左距。如果左边的边距是10px，那么每行有30px的边距分布在4个项目中。项目宽度百分比计算方法如下:

100% / 4 - horizontal-border - horizontal-padding - left-margin * (4 - 1) / 4

这是一个体面的工作，涉及flexbox最后一行的问题。

.flex { display: flex; flex-direction: row; flex-wrap: wrap; margin: 1em 0 3em; background-color: peachpuff; } .item { margin-left: 10px; border: 1px solid; padding: 10px; width: calc(100% / 4 - 2px - 20px - 10px * (4 - 1) / 4); background-color: papayawhip; } .item:nth-child(4n + 1) { margin-left: 0; } .item:nth-child(n + 5) { margin-top: 10px; } <div class="flex"> <div class="item">1</div> <div class="item">2</div> <div class="item">3</div> <div class="item">4</div> </div> <div class="flex"> <div class="item">1</div> <div class="item">2</div> <div class="item">3</div> <div class="item">4</div> <div class="item">5</div> <div class="item">6</div> </div> <div class="flex"> <div class="item">1</div> <div class="item">2</div> <div class="item">3</div> <div class="item">4</div> <div class="item">5</div> <div class="item">6</div> <div class="item">7</div> <div class="item">8</div> <div class="item">9</div> </div>

一个可能的解决方案是使用justify-content: flex-start;在.grid容器中，其子元素的大小限制以及适当子元素的边距——取决于所需的列数。

对于一个3列网格，基本的CSS看起来是这样的:

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

.grid > * {
    flex: 0 0 32%;
    margin: 1% 0;
}

.grid > :nth-child(3n-1) {
    margin-left: 2%;
    margin-right: 2%;
}

这是另一个不完美的解决方案，但它有效。

http://codepen.io/tuxsudo/pen/VYERQJ

你还可以这样做:

.exposegrid:last-child {
  margin-right: auto;
}