我正在尝试带有react 16.7的钩子的功能组件，出现错误：
src/组件/页脚/index.js
function Footer() {
const [selectedTab, setSelectedTab] = useState('redTab');
const [hidden, setHidden] = useState(false);
const [fullScreen, setFullScreen] = useState(false);
//...
}
包.json
我应该怎么办？
确保您已升级react-dom to 16.7.0-alpha.0以及。
包.json
{
"dependencies": {
"react": "16.7.0-alpha.0",
"react-dom" :"16.7.0-alpha.0",
...
},
...
}
也可能是您只更新了版本package.json无需安装新版本。您可以删除node_modules并再次安装 https://docs.npmjs.com/cli/ci.
npm ci
Example
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/[email protected] /cdn-cgi/l/email-protection/umd/react.development.js"></script>
<script src="https://unpkg.com/[email protected] /cdn-cgi/l/email-protection/umd/react-dom.development.js"></script>
<div id="root"></div>
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