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https://zh-hans.reactjs.org/docs/hooks-rules.html#explanation
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在 React 中,Hooks 是一种特殊的函数,用于在函数组件中添加状态、生命周期等特性。Hooks 可以在函数组件的顶层使用,但不能在条件语句、循环语句或嵌套函数中使用。这是因为 Hooks 的使用依赖于 React 的调用顺序和内部状态的管理机制。
下面是为什么不能在表达式中定义 React Hooks 的原因:
Hooks 必须在函数组件的顶层使用:
Hooks 需要在每次渲染时保持稳定:
因此,为了确保 React 组件的正确运行和状态管理,Hooks 必须在函数组件的顶层使用,而不能在表达式中定义。如果需要根据条件动态使用 Hooks,可以考虑使用条件渲染或自定义钩子来管理。
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