我使用react-cli创建一个应用,然后导入material-UI,只需一个简单的代码
App.js
import React from 'react';
import logo from './logo.svg';
import './App.css';
import Appbar from './Componets/Appbar/Appbar'
function App() {
return (
<div className="App">
<Appbar />
</div>
);
}
export default App;
Appbar.js
import React from 'react';
import {AppBar,Toolbar,Typography } from '@material-ui/core'
function Appbar(){
return (
<AppBar>
<Toolbar>
<Typography variant="h5" color="inherit">
BLACKPINK HOUSE
</Typography>
</Toolbar>
</AppBar>
)
}
//before
export default AppBar
//after
export default Appbar
我还修改了节点的依赖关系
{
"name": "news",
"version": "0.1.0",
"private": true,
"dependencies": {
"@testing-library/jest-dom": "^4.2.4",
"@testing-library/react": "^9.5.0",
"@testing-library/user-event": "^7.2.1",
"react": "16.13.0",
"react-dom": "16.13.0",
"react-scripts": "3.4.3"
},
它只是无法启动,如果我删除了应用内的应用栏,它将运行
错误消息是这样的
错误:无效的挂钩调用。挂钩只能在功能组件的主体内部调用。发生这种情况可能是由于以下原因之一:
模块../src/index.js C:/用户/管理员/桌面/MaterialUI/news/src/index.js:7
4 | import App from './App';
5 | import * as serviceWorker from './serviceWorker';
6 |
> 7 | ReactDOM.render(
8 | <React.StrictMode>
9 | <App />
10 | </React.StrictMode>,
webpack_require C:/用户/管理员/桌面/ MaterialUI / news / webpack / bootstrap:784
781 | };
782 |
783 | // Execute the module function
> 784 | modules[moduleId].call(module.exports, module, module.exports, hotCreateRequire(moduleId));
| ^ 785 |
786 | // Flag the module as loaded
787 | module.l = true;
fn C:/ Users / Administrator / Desktop / MaterialUI / news / webpack / bootstrap:150
147 | );
148 | hotCurrentParents = [];
149 | }
> 150 | return __webpack_require__(request);
| ^ 151 | };
152 | var ObjectFactory = function ObjectFactory(name) {
153 | return {
webpack_require C:/用户/管理员/桌面/ MaterialUI / news / webpack / bootstrap:784
781 | };
782 |
783 | // Execute the module function
> 784 | modules[moduleId].call(module.exports, module, module.exports, hotCreateRequire(moduleId));
| ^ 785 |
786 | // Flag the module as loaded
787 | module.l = true;
checkDeferredModules C:/用户/管理员/桌面/ MaterialUI / news / webpack / bootstrap:45
42 | }
43 | if(fulfilled) {
44 | deferredModules.splice(i--, 1);
> 45 | result = __webpack_require__(__webpack_require__.s = deferredModule[0]);
| ^ 46 | }
47 | }
48 |
Array.webpackJsonpCallback [作为推送] C:/用户/管理员/桌面/ MaterialUI / news / webpack / bootstrap:32
29 | deferredModules.push.apply(deferredModules, executeModules || []);
30 |
31 | // run deferred modules when all chunks ready
> 32 | return checkDeferredModules();
| ^ 33 | };
34 | function checkDeferredModules() {
35 | var result;