html - 为什么 div 的内容会受到其显示的影响？

Question

总结:我想并排放置两个文本 block (包含在 div 中)，这两个 block 通过 flexbox 进行管理.然而，他们的内容受到 display 的影响。 parent 的div .

(以下代码在JSFiddle)

为什么会出现下面的代码

.flex {
  display: flex;
  flex-direction: row;
}

<div class="flex">
  <div class="flex">
    this is the content of the left box
  </div>
  <div class="flex">
    this is the content of the right box
    <p>
      with some paragraphs
    </p>
    <p>
      more paragraphs
    </p>
  </div>
</div>

显示为

我原以为这两段会在“这是右框的内容”下面。为什么它们遵循 div 的行对齐方式s 类 flex ？我怎样才能阻止他们这样做？ (我的印象是 display: flex 只会覆盖 div 容器，但这些 div 的内容将呈现为默认定位)

Answer 1

因为 flex-container 的子项是 flex-items 并且失去了它们的默认显示属性。

甚至文本节点...

Each in-flow child of a flex container becomes a flex item, and each contiguous run of text that is directly contained inside a flex container is wrapped in an anonymous flex item.

来自Spec

A flex item establishes a new formatting context for its contents. The type of this formatting context is determined by its display value, as usual. However, flex items themselves are flex-level boxes, not block-level boxes: they participate in their container’s flex formatting context, not in a block formatting context.

因此，要实现您想要的布局，请确保子 div 不是 display:flex。

.flex {
  display: flex;
  flex-direction: row;
}
.flex div {
  border: 1px solid grey;
}

<div class="flex">
  <div class="">
    this is the content of the left box
  </div>
  <div class="">
    this is the content of the right box
    <p>
      with some paragraphs
    </p>
    <p>
      more paragraphs
    </p>
  </div>

</div>