reactjs - TypeError : Object(. ..) 在 React 版本 16.13.1 中不是 "useCallBack"的函数

Question

我在浏览器的本地主机端口上收到一条错误消息，我还没有部署我的代码:

TypeError: Object(...) 不是一个函数

新事件src/events/pages/NewEvent.js:51

---

这里是我在 package.json 中的 react 版本:

  "dependencies": {
    "react": "^16.13.1",
    "react-dom": "^16.13.1",
    "react-router-dom": "5.2.0",
    "react-scripts": "^3.2.0",
    "react-transition-group": "^4.4.1"
  },

我在我的页面中导入了 NewEvent.js :

import React, {useCallBack , useReducer} from 'react'; 

在同一页面中，我在一个函数中嵌套了另一个函数:

  const [formState, dispatch] = useReducer(formReducer, {
    inputs: {
      title: {
        value: '',
        isValid: false
      },
      description: {
        value: '',
        isValid: false
      }
    },
    isValid: false
  });// this is the initial state that needs  to be update in the reducer

  const inputHandler = useCallBack((id,value,isValid) => {
 
  dispatch({
    type: 'INPUT_CHANGE',
    value: value,
    isValid: isValid,
    inputId: id,
   });
 }, []);

问题在浏览器中显示为以下行:

  const inputHandler = useCallBack((id,value,isValid) => {

useCallBack is supposed to stop the code to loop when there is several function..I checked online in other post it seems to be link with the version of react, but I am not sure and quite confused.

这里是控制台中的消息:

log.js:24 [HMR] Waiting for update signal from WDS...
NewEvent.js:51 Uncaught TypeError: Object(...) is not a function

    at NewEvent (NewEvent.js:51)
    at renderWithHooks (react-dom.development.js:14803)
    at mountIndeterminateComponent (react-dom.development.js:17482)
    at beginWork (react-dom.development.js:18596)
    at HTMLUnknownElement.callCallback (react-dom.development.js:188)
    at Object.invokeGuardedCallbackDev (react-dom.development.js:237)
    at invokeGuardedCallback (react-dom.development.js:292)
    at beginWork$1 (react-dom.development.js:23203)
    at performUnitOfWork (react-dom.development.js:22154)
    at workLoopSync (react-dom.development.js:22130)
    at performSyncWorkOnRoot (react-dom.development.js:21756)
    at scheduleUpdateOnFiber (react-dom.development.js:21188)
    at updateContainer (react-dom.development.js:24373)
    at react-dom.development.js:24758
    at unbatchedUpdates (react-dom.development.js:21903)
    at legacyRenderSubtreeIntoContainer (react-dom.development.js:24757)
    at Object.render (react-dom.development.js:24840)
    at Module../src/index.js (index.js:7)
    at __webpack_require__ (bootstrap:784)
    at fn (bootstrap:150)
    at Object.1 (Users.js:19)
    at __webpack_require__ (bootstrap:784)
    at checkDeferredModules (bootstrap:45)
    at Array.webpackJsonpCallback [as push] (bootstrap:32)
    at main.chunk.js:1
index.js:1 The above error occurred in the <NewEvent> component:
    in NewEvent (at App.js:23)
    in Route (at App.js:22)
    in Switch (at App.js:15)
    in main (at App.js:14)
    in Router (created by BrowserRouter)
    in BrowserRouter (at App.js:11)
    in App (at src/index.js:7)

Consider adding an error boundary to your tree to customize error handling behavior.
react-dom.development.js:22665 Uncaught TypeError: Object(...) is not a function
    at NewEvent (NewEvent.js:51)
    at renderWithHooks (react-dom.development.js:14803)
    at mountIndeterminateComponent (react-dom.development.js:17482)
    at beginWork (react-dom.development.js:18596)
    at HTMLUnknownElement.callCallback (react-dom.development.js:188)
    at Object.invokeGuardedCallbackDev (react-dom.development.js:237)
    at invokeGuardedCallback (react-dom.development.js:292)
    at beginWork$1 (react-dom.development.js:23203)
    at performUnitOfWork (react-dom.development.js:22154)
    at workLoopSync (react-dom.development.js:22130)
    at performSyncWorkOnRoot (react-dom.development.js:21756)
    at scheduleUpdateOnFiber (react-dom.development.js:21188)
    at updateContainer (react-dom.development.js:24373)
    at react-dom.development.js:24758
    at unbatchedUpdates (react-dom.development.js:21903)
    at legacyRenderSubtreeIntoContainer (react-dom.development.js:24757)
    at Object.render (react-dom.development.js:24840)
    at Module../src/index.js (index.js:7)
    at __webpack_require__ (bootstrap:784)
    at fn (bootstrap:150)
    at Object.1 (Users.js:19)
    at __webpack_require__ (bootstrap:784)
    at checkDeferredModules (bootstrap:45)
    at Array.webpackJsonpCallback [as push] (bootstrap:32)
    at main.chunk.js:1

---

浏览器上显示的信息:

NewEvent
src/events/pages/NewEvent.js:51
  48 |   isValid: false
  49 | });// this is the initial state that needs  to be update in the reducer
  50 | 
> 51 | const inputHandler = useCallBack((id,value,isValid) => {
     | ^  52 | //this function will received the id of the input that changed, value and answer whether it's valid or not
  53 | dispatch({
  54 |   type: 'INPUT_CHANGE',

View compiled
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Module../src/index.js

有人知道这个问题吗？

-- 对不起，我的帖子很长 -- :D

Answer 1

所以我花了一些时间尝试重现此错误，最终意识到这是一个不幸的打字错误。

简而言之，这样做:import React, { useCallback, useReducer } from "react";(注意回调中的小写 b ).

很难收集到实际错误是什么，仅给出这么多信息:TypeError: undefined is not a function。

但是，MDN docs关于 TypeError 的(除其他事项外)状态:

Maybe there is a typo in the function name?

希望这会有所帮助!