CSS flex 布局中没有 justify-items 和 justify-self align-items 和 align-self，却没有 justify-items 和 justify-self 呢？要解答这个问题，首先需要理解主轴（main axis）和交叉轴（cross axis）之间的差异。
- 主轴和交叉轴的区别
在没有折行的情况下，一个 flex 容器（flex container）只有一个主轴，但却有 n 个交叉轴（n 代表 flex item的数量）。每个 flex item 都拥有自己独立的交叉轴。
一个 flex item 在主轴上的位置会影响其他 flex item，因为它们共享相同的主轴，而交叉轴却不会引发这种相互影响。
- CSS 属性的命名规则
2.1 align-* 和 justify-*
在 CSS flex 布局中，属性名称中的 justify-* 表示这是应用于主轴上的规则，而 align-* 表示这是应用于交叉轴上的规则。
2.2 *-items， *-content 和 *-self
*-self 表示每个 flex item 都拥有独立的轴，它们在轴上的位置不会影响其他 flex item。我们可以针对单个 item 设置它的位置。
*-items 和 *-self 在本质上相似，只不过前者是批量设置，而后者是针对单个 item 的设置。可以看作是一个语法糖。
*-content 表示多个 flex item 共享一个轴，一个 flex item 在轴上的位置会影响其他 flex item。
- 总结
因此，在 flex 布局中，我们不能使用 justify-items，因为多个元素共享一个轴，它们属于同一组，这会导致相互干扰。想象一下：假如我们指定了justify-items: flex-end，最终只会有一个元素抢到这个位置。
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https://github.COM/devoben2000/vdfrfs5rfw/issues/328
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https://github.COM/devoben2000/vdfrfs5rfw/issues/330
https://github.COM/devoben2000/vdfrfs5rfw/issues/331
https://github.COM/devoben2000/vdfrfs5rfw/issues/332
https://github.COM/devoben2000/vdfrfs5rfw/issues/333
https://github.COM/devoben2000/vdfrfs5rfw/issues/334
https://github.COM/devoben2000/vdfrfs5rfw/issues/335
https://github.COM/devoben2000/vdfrfs5rfw/issues/336
https://github.COM/devoben2000/vdfrfs5rfw/issues/337
https://github.COM/devoben2000/vdfrfs5rfw/issues/338
https://github.COM/devoben2000/vdfrfs5rfw/issues/339
同样的道理，我们也不能使用 justify-self，因为各元素之间可能会竞争位置导致冲突。但是，我们可以采用其