根据文档描述，class组件的render函数是必选的：The render() method is the only required method in a class component.
对应文档： https://reactjs.org/docs/react-component.html#render
根据文档描述，class组件的render函数是必选的：The render() method is the only required method in a class component.
对应文档： https://reactjs.org/docs/react-component.html#render
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