我是ReactJ的新手。在我的应用程序中,我插入了下面的代码来验证textArea,但是当我键入它时,它会抛出以下错误。
NewBrand.js:67 Uncaught TypeError: Cannot read property 'validateName' of undefined
at handleNameChange (NewBrand.js:67)
at TextArea._this.handleTextareaChange (TextArea.js:94)
at HTMLUnknownElement.callCall
我在启动服务器时遇到了一个问题...
Windows PowerShell
Copyright (C) Microsoft Corporation. All rights reserved.
Try the new cross-platform PowerShell https://aka.ms/pscore6
PS C:\WINDOWS\system32> cd C:\Users\Smart-User^
PS C:\Users\Smart-User^> cd C:\Users\Smart-User^\Desktop\2q9\react\react-app
PS C:\User
我正在尝试使导航菜单类似于reactjs.org中的导航菜单,我正在使用Header组件和导航,它是带有链接和名称的对象。我使用状态添加onClick类,但这会切换所有按钮。 import React, { useState } from "react";
import styles from "./index.module.css";
import getNavigation from "../../utils/navigation";
import { Link } from "react-router-dom";
impo