查看测试用例/预期的错误，您是正确的，应该克隆对象。

Warning: `div` was passed a style object that has previously been
mutated. Mutating `style` is deprecated. Consider cloning it
beforehand. Check the `render` of `App`. Previous style:
{border: "1px solid black"}. Mutated style:
{border: "1px solid black", position: "absolute"}.

https://github.com/facebook/react/blob/fc96f31fade8043856eb7bc34c56598c4a576110/src/renderers/dom/shared/
测试 /ReactDOMComponent-
test.js#L128

我想这与道具的推理类似-它使您免于在任何地方传递可变样式对象，并最终失去了React真正擅长为您提供帮助的大量推理功能。

The props object is now frozen, so mutating props after creating a component element is no longer supported. In most cases, React.cloneElement should be used instead. This change makes your components easier to reason about and enables the compiler optimizations mentioned above.