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23 lines
513 B
23 lines
513 B
import React from "react";
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import ReactDOM from "react-dom";
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// 组件的类型
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type State = { count: number}
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type Props = { message?: string}
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// 无 props, 无 state
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class C1 extends React.Component {}
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// 有 props，无 state
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class C2 extends React.Component<Props> {}
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// 无 props，有 state
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class C3 extends React.Component<{}, State> {}
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// 有 props，有 state
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class C4 extends React.Component<Props, State> {}
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const App = () => <div></div>
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ReactDOM.render(<App />, document.getElementById('root'))
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