下面的三个入门文档都太好了, 我都没啥可写的了, 尤其是第三个: css-tricks.com
参考:
- https://developer.mozilla.org/zh-CN/docs/Web/CSS/CSS_Flexible_Box_Layout/Basic_Concepts_of_Flexbox
- https://developer.mozilla.org/zh-CN/docs/Learn/CSS/CSS_layout/Flexbox
- https://css-tricks.com/snippets/css/a-guide-to-flexbox/