衍生自：http://www.zhihu.com/question/28634169/answer/41563077
我记得 Medium 发布文章的时候会自动去除掉写作者自己换行的排版，然后统一变成一个
，再由 Medium 的 CSS 来控制段间距达到统一的效果。所以知乎这样是偷懒么= =
回复内容：
简单一句话：知乎负责实现这部分功能的工程师缺乏追求极致卓越的心。 主要是方便。
和用户输入的换行符是一一对应的，所以总是能符合用户换行的预期。而
的样式里包含了段前后间距、行高等，不一定符合用户的预期。因为用户换行不代表他想输入一个新段落。
比如空多行时，用户想要的排版效果是空多行行高，而简单地替换成
就会变成空多行段间距。
所以尽管前端都讨厌用
排版，但我还是觉得用
要比
更方便稳妥。毕竟用户的意图往往难以揣度。
当然这些也不是不能解决，就是麻烦了点。或许这就是 @贺师俊 前辈说的缺乏追求极致的心吧。
完全是前端的编程习惯，何必纠结
经过试验，我在编辑器里面，按enter，也就是硬回车，会另开一个段落（用div控制），按shift+enter，也就是软回车，会用br标签。但是当我发布的时候，全被改成br。所以是不是被后端处理的？
反正知乎的答案不需要花花绿绿的格式，不用上样式。
可是比
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