如何解决使用React Recoil时弹出错误
我只是想学习React Recoil。并遇到以下问题。
错误:元素类型无效:需要一个字符串(对于内置组件)或一个类/函数(对于复合组件),但得到:对象
只需遵循本教程中提到的步骤 https://blog.logrocket.com/simple-state-management-recoil/
尝试了以下溢出帖子中提到的任何内容 https://www.dropbox.com/s/paosp6iom9oks9p/InnerViewPropBind.zip 没有运气!
import React from 'react';
import RecoilRoot from 'recoil';
import CharacterCounter from './CharacterCounter';
import './App.css';
function App() {
return (
<RecoilRoot>
<CharacterCounter />
</RecoilRoot>
);
}
export default App;
import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import App from './App';
import * as serviceWorker from './serviceWorker';
ReactDOM.render(
<App />,document.getElementById('root')
);
import { atom } from 'recoil';
export const textState = atom({
key: 'textState',// unique ID (with respect to other atoms/selectors)
default: '',// default value (aka initial value)
});
import { selector } from 'recoil';
import { textState } from './atom';
export const charCountState = selector({
key: 'charCountState',// unique ID (with respect to other atoms/selectors)
get: ({ get }) => {
const text = get(textState);
return text.length;
},});
import React from 'react';
import TextInput from './TextInput';
import CharacterCount from './CharacterCount';
function CharacterCounter() {
return (
<div>
<TextInput />
<CharacterCount />
</div>
);
}
export default CharacterCounter;
import React from 'react';
import { useRecoilState } from 'recoil';
import { textState } from './atom';
function Textinput() {
const [text,setText] = useRecoilState(textState);
const onChange = (event) => {
setText(event.target.value);
};
return (
<div>
<input type="text" value={text} onChange={onChange} />
<br />
Echo: {text}
</div>
);
}
export default TextInput;
import React from 'react';
import { useRecoilValue } from 'recoil';
import { charCountState } from './selector';
export function CharacterCount() {
const count = useRecoilValue(charCountState);
return (<div>Character Count: {count}</div>);
}
export default CharacterCount;
问题: 错误:元素类型无效:应使用字符串(对于内置组件)或类/函数(对于复合组件),但得到:对象。
Check the render method of `App`.
▶ 20 stack frames were collapsed.
Module../src/index.js
D:/Mohan/Projects/2020/Experiments/Recoil/recoil-example/src/index.js:8
import App from './App';
import * as serviceWorker from './serviceWorker';
ReactDOM.render(
<App />,
解决方法
App.js中的RecoilRoot导入应为:
import { RecoilRoot } from 'recoil';
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