Using empty string to prevent updating of dangerouslySetInnerHTML?

From @sebmarkbage's comment over in the React repo it sounds like dangerouslySetInnerHTML doesn't update the underlying DOM if it receives an empty string. I could also reproduce this: https://repl.it/repls/MotherlyPuzzlingComma

That's useful behavior for us in a server-rendering context where we don't need to ship the HTML to the client. But before merging that PR, I want to make sure this behavior is intended and not going away silently. And if so, should we maybe document it on the website?

首先查看链接的 React issue 评论、repro 以及引用的 mozilla/kuma pull request，以确定空的 dangerouslySetInnerHTML 是否是预期行为。完成的标准是确认该行为，并决定是否应在 React 文档网站上进行说明。