确保您将react-dom
也升级到16.7.0-alpha.0
。
package.json
{
"dependencies": {
"react": "16.7.0-alpha.0",
"react-dom" :"16.7.0-alpha.0",
...
},
...
}
也可能是你只是修改了package.json
中的版本号而没有安装新版本。可以删除node_modules
文件夹并重新安装。
npm ci
例子
const { useState } = React;
function Footer() {
const [selectedTab, setSelectedTab] = useState('redTab');
const [hidden, setHidden] = useState(false);
const [fullScreen, setFullScreen] = useState(false);
return (
<div>
<button onClick={() => setSelectedTab('blueTab')}>{selectedTab}</button>
<button onClick={() => setHidden(isHidden => !isHidden)}>
{hidden ? 'hidden' : 'visible'}
</button>
<button onClick={() => setFullScreen(isFullScreen => !isFullScreen)}>
{fullScreen ? 'fullscreen' : 'windowed'}
</button>
</div>
);
}
ReactDOM.render(
<Footer />,
document.getElementById('root')
);
<script src="https://unpkg.com/react@16.7.0-alpha.0/umd/react.development.js"></script>
<script src="https://unpkg.com/react-dom@16.7.0-alpha.0/umd/react-dom.development.js"></script>
<div id="root"></div>
react-dom
依赖项。https://reactjs.org/docs/hooks-state.html - CTS_AEimport React, { useRef, useState } from 'react';
function Counter() {
const [count, setCount] = useState(0);
const [icount, setICount] = useState(0);
const {current: increment} = useRef(1 + Math.floor(Math.random() * 5));
return (
<div>
Count {count}<br />
Increment {increment}<br />
<button onClick={() => {
setCount(count + 1);
setICount(icount + increment);
}} clicks={count}>
Current {icount}
</button>
</div>
);
}
export default Counter;
该导出功能可以通过基本应用程序进行测试/使用,例如:
import React from 'react';
import ReactDOM from 'react-dom';
import Counter from './Counter';
ReactDOM.render(<Counter />, document.body);
您的package.json中React和react-dom版本不同,
因此要解决此问题,您需要将react-dom升级到与react相同的版本。
运行以下命令。这将安装react-dom版本16.7.0-alpha.0
npm i -s react-dom@16.7.0-alpha.0
package.json
中升级了版本吗?尝试删除node_modules
并重新安装:rm -rf ./node_modules && npm install
。确保你也将react-dom
升级到相同的版本。 - Tholle