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docs(cn): translate reference/rules/rules-of-hooks.md into Chinese (#1502)
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src/content/reference/rules/rules-of-hooks.md

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---
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title: Rules of Hooks
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title: Hook 的规则
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---
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<Intro>
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Hooks are defined using JavaScript functions, but they represent a special type of reusable UI logic with restrictions on where they can be called.
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Hook 是使用 JavaScript 函数定义的,但它们代表了一种特殊的可重用的 UI 逻辑,并且对它们可以被调用的位置有限制。
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</Intro>
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<InlineToc />
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---
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## Only call Hooks at the top level {/*only-call-hooks-at-the-top-level*/}
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## 只在顶层调用 Hook {/*only-call-hooks-at-the-top-level*/}
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Functions whose names start with `use` are called [*Hooks*](/reference/react) in React.
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在 React 中,以 `use` 开头命名的函数被称为 **[Hook](/reference/react)**
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**Don’t call Hooks inside loops, conditions, nested functions, or `try`/`catch`/`finally` blocks.** Instead, always use Hooks at the top level of your React function, before any early returns. You can only call Hooks while React is rendering a function component:
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**不要在循环、条件语句、嵌套函数或 `try`/`catch`/`finally` 代码块中调用 Hook**。相反,你应该在 React 函数组件的顶层使用 Hook,且在任何提前返回之前。你只能在 React 渲染函数组件时调用 Hook:
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*Call them at the top level in the body of a [function component](/learn/your-first-component).
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*Call them at the top level in the body of a [custom Hook](/learn/reusing-logic-with-custom-hooks).
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*[函数组件主体](/learn/your-first-component) 的顶层调用它们。
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*[自定义 Hook 主体](/learn/reusing-logic-with-custom-hooks) 的顶层调用它们。
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```js{2-3,8-9}
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function Counter() {
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// ✅ Good: top-level in a function component
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// ✅ 正确的:在函数组件顶层
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const [count, setCount] = useState(0);
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// ...
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}
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function useWindowWidth() {
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// ✅ Good: top-level in a custom Hook
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// ✅ 正确的:在自定义 Hooks 顶层
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const [width, setWidth] = useState(window.innerWidth);
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// ...
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}
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```
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It’s **not** supported to call Hooks (functions starting with `use`) in any other cases, for example:
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不支持在其他任何情况下调用以 `use` 开头的 Hook,例如:
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* 🔴 Do not call Hooks inside conditions or loops.
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* 🔴 Do not call Hooks after a conditional `return` statement.
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* 🔴 Do not call Hooks in event handlers.
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* 🔴 Do not call Hooks in class components.
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* 🔴 Do not call Hooks inside functions passed to `useMemo`, `useReducer`, or `useEffect`.
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* 🔴 Do not call Hooks inside `try`/`catch`/`finally` blocks.
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* 🔴 不要在条件语句或循环中调用 Hook。
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* 🔴 不要在条件性的 `return` 语句之后调用 Hook。
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* 🔴 不要在事件处理函数中调用 Hook。
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* 🔴 不要在类组件中调用 Hook。
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* 🔴 不要在传递给 `useMemo``useReducer` `useEffect` 的函数内部调用 Hook。
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* 🔴 不要在 `try`/`catch`/`finally` 代码块中调用 Hook。
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If you break these rules, you might see this error.
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如果你违反了这些规则,你可能会看到以下错误:
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```js{3-4,11-12,20-21}
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function Bad({ cond }) {
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if (cond) {
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// 🔴 Bad: inside a condition (to fix, move it outside!)
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// 🔴 错误的:在条件语句内部(要修复这个问题,将其移到外部!)
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const theme = useContext(ThemeContext);
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}
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// ...
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}
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function Bad() {
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for (let i = 0; i < 10; i++) {
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// 🔴 Bad: inside a loop (to fix, move it outside!)
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// 🔴 错误的:在循环语句内部(要修复这个问题,将其移到外部!)
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const theme = useContext(ThemeContext);
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}
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// ...
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if (cond) {
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return;
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}
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// 🔴 Bad: after a conditional return (to fix, move it before the return!)
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// 🔴 错误的:在条件性 return 语句之后(要修复这个问题,将其移到 return 之前!)
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const theme = useContext(ThemeContext);
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// ...
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}
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function Bad() {
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function handleClick() {
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// 🔴 Bad: inside an event handler (to fix, move it outside!)
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// 🔴 错误的:在事件处理函数内部(要修复这个问题,将其移到 return 之前!)
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const theme = useContext(ThemeContext);
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}
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// ...
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}
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function Bad() {
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const style = useMemo(() => {
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// 🔴 Bad: inside useMemo (to fix, move it outside!)
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// 🔴 错误的:在 useMemo 内部调用(要修复这个问题,将其移到外部!)
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const theme = useContext(ThemeContext);
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return createStyle(theme);
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});
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class Bad extends React.Component {
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render() {
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// 🔴 Bad: inside a class component (to fix, write a function component instead of a class!)
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// 🔴 错误的:在类组件内部调用(要修复这个问题,改写为函数组件!)
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useEffect(() => {})
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// ...
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}
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}
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function Bad() {
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try {
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// 🔴 Bad: inside try/catch/finally block (to fix, move it outside!)
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// 🔴 错误的:在 trycatchfinally 代码块内部调用(要修复这个问题,将其移到外部!)
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const [x, setX] = useState(0);
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} catch {
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const [x, setX] = useState(1);
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}
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}
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```
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You can use the [`eslint-plugin-react-hooks` plugin](https://www.npmjs.com/package/eslint-plugin-react-hooks) to catch these mistakes.
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你可以使用 [`eslint-plugin-react-hooks` 插件](https://www.npmjs.com/package/eslint-plugin-react-hooks) 来捕获这些错误。
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<Note>
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[Custom Hooks](/learn/reusing-logic-with-custom-hooks) *may* call other Hooks (that's their whole purpose). This works because custom Hooks are also supposed to only be called while a function component is rendering.
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[自定义 Hook](/learn/reusing-logic-with-custom-hooks) **可以** 调用其他 Hook(这正是它们的主要目的)。之所以可以这样做,是因为自定义 Hook 也应该只在函数组件渲染时被调用。
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</Note>
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---
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## Only call Hooks from React functions {/*only-call-hooks-from-react-functions*/}
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## 仅在 React 函数中调用 Hook {/*only-call-hooks-from-react-functions*/}
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Don’t call Hooks from regular JavaScript functions. Instead, you can:
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不要在常规的 JavaScript 函数中调用 Hook。相反,你可以:
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Call Hooks from React function components.
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Call Hooks from [custom Hooks](/learn/reusing-logic-with-custom-hooks#extracting-your-own-custom-hook-from-a-component).
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React 函数组件中调用 Hook。
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[自定义 Hook](/learn/reusing-logic-with-custom-hooks#extracting-your-own-custom-hook-from-a-component) 中调用 Hook。
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By following this rule, you ensure that all stateful logic in a component is clearly visible from its source code.
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遵循这条规则,你可以确保组件中的所有状态逻辑在其源代码中清晰可见。
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```js {2,5}
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function FriendList() {

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