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我使用CSS网格来布局这样的一些项目...

#container {
  display: grid;
  grid-template-columns: 16.666% 16.666% 16.666% 16.666% 16.666% 16.666%;
}

.item {
  background: teal;
  color: white;
  padding: 20px;
  margin: 10px;
}

<div id="container">
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
</div>

CSS Grid不适合整行对齐,因为交叉的轨道会挡住去路。下面是详细的解释:

对齐整行/整列的网格项目(就像flex项目一样) 或者,使用flexbox和justify-content: center。

这会将所有项目打包到行的水平中心。然后你的利润会把它们分开。

在完全填充的行上,justify-content将不起作用,因为没有空闲空间让它工作。

在有空闲空间的行上(在您的例子中,只有最后一行),项目居中。

#container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}

.item {
  flex: 0 0 calc(16.66% - 20px);
  background: teal;
  color: white;
  padding: 20px;
  margin: 10px;
}

* {
  box-sizing: border-box;
}

<div id="container">
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
</div>

找到一篇关于如何用伪选择器控制剩余网格项目的文章

.grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  grid-gap: 20px;
  margin: 20px;
  padding: 20px;  
}
.item {
  grid-column: span 2;
  background: #AB47BC;
  padding: 20px;
}

/* Dealing with 2 orphan items */

.item:last-child:nth-child(3n - 1) {
  grid-column-end: -2;
}

.item:nth-last-child(2):nth-child(3n + 1) {
  grid-column-end: 4;
}

/* Dealing with single orphan */

.item:last-child:nth-child(3n - 2) {
  grid-column-end: 5;
}

<div class="wrapper">
    <div class="grid grid--1">
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
    </div>

    <div class="grid grid--2">
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
    </div>
</div>

这违背了网格系统的目的。网格是一个二维数组,其中所有东西都有一个X和Y值,就像电子表格一样。

是的,你想要一个包装物品的系统。由于flex-wrap,Flexbox符合这里的要求。

#container {
  padding: 10px;
  width: calc((100px + (10px * 2)) * 4); /* item width + padding on either side times number of items */
  display: flex;
  flex-wrap: wrap;
  background: blue;
  margin: 10px;
}

#container div {
  width: 100px;
  height: 100px;
  flex-grow: 1;
  background: red;
  margin: 10px;
}

https://jsfiddle.net/0c0hzh8t/

这使得子元素占据了所有的可用空间,如果一行已满,则没有可用空间,这将是它的标准大小。

如果您希望容器自动调整大小,则移除width属性,容器及其项将自动调整大小。这也无妨,但我假设您想要定义一行中的项目数量。

没有特定的属性可以使最后一行的行为不同于前面的行。

不过,基于您定义了一个与视口宽度内的n个项目相匹配的集合宽度这一事实,您可以使用Flexbox及其justify-content属性。

将它设置为居中,它会将任意数量的项目的最后一行居中。

堆栈片段

html, body {
  margin: 0;
}

#container {
  display: flex;
  flex-wrap: wrap;                  /*  allow items to wrap  */
  justify-content: center;          /*  horizontally center items  */
}

.item {
  flex-basis: calc(16.666% - 20px); /*  subtract the margin from the width  */
  background: teal;
  color: white;
  padding: 20px;
  margin: 10px;
  box-sizing: border-box;           /*  make padding be included in the set width  */
}

<div id="container">
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
</div>

这将使行内的任何项目居中,而无需使用flex

.center-item {
    grid-column: 1 / -1;
}

密码笔

<div class="grid grid-cols-3 justify-items-center gap-2">
    <div class="w-5">1</div>
    <div class="w-5">2</div>
    <div class="w-5">3</div>
    <div class="w-5">4</div>
    <div class="w-5">5</div>
    <div class="w-5">6</div> 
    <div class="w-5">7</div>
    <div class="w-5">8</div>
    <div class="w-5">9</div>
    <div class="col-span-3">0</div>
 </div>

.col-span-3 {
  grid-column: span 3 / span 3;
}

.grid {
  display: grid;
}

.w-5 {
  width: 1.25rem;
}

.grid-cols-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.justify-items-center {
  justify-items: center;
}

.gap-2 {
  gap: 0.5rem;
}

对于网格项目

grid-column: 1/-1;
margin: 0 auto;

我在网格方面没做多少工作,但据我所知,如果你想使用Flex-box,就使用这段代码。

#container {
  display: flex;
  flex-wrap: wrap;
  flex-direction: row;
 }

.item {
  flex: 1;
  flex-basis: 16.66%;
  background: teal;
  color: white;
  padding: 20px;
  margin: 10px;
}

<div id="container">
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
</div>

这是我写HTML邮件的解决方案(截至2018年4月23日):

#wrapper {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  grid-row-gap: 0;
  grid-column-gap: 15px;
  padding: 15px 15px 0 15px;
}

.item {
  border: 1px solid #000;
  height: 200px;
  margin-bottom: 15px;
}

<div style="width: 100%; margin: 0 auto; text-align: center; vertical-align: middle;">
  <div style="overflow: auto; height: 400px; margin-top: 15px;">
    <div style="position: relative">
      <div id="wrapper">
        <div class="item"><div>Item 1</div></div>
        <div class="item"><div>Item 2</div></div>
        <div class="item"><div>Item 3</div></div>
        <div class="item"><div>Item 4</div></div>
        <div class="item"><div>Item 5</div></div>
        <div class="item"><div>Item 6</div></div>
        <div class="item"><div>Item 7</div></div>
        <div class="item"><div>Item 8</div></div>
      </div>
      <div style="position: absolute; bottom: -30px; text-align: center; margin: 0 auto; width: 100%;">
        <div style="background-color: #defabc; width: 300px; margin: 0 auto; text-align: center; cursor: pointer;">
          <span style="color: #000;">See all items</span>
        </div>
      </div>
    </div>
  </div>
</div>