• 类组件createContext、静态属性contextType 与函数组件useContext 的对比

import { Component, createContext, useContext } from 'react'
const AppContext = createContext(0)
class Foo extends Component {render() {return (<AppContext.Consumer>{value => ('Foo:' + value)}</AppContext.Consumer>)}
}
class Bar extends Component {static contextType = AppContextrender() {const value = this.contextreturn <>Bar:{value}</>}
}
const Baz = () => {const value = useContext(AppContext)return <>Baz:{value}</>
}
const Middle = () => {return (<><AppContext.Provider value={888}><Foo /><br /><Bar /><br /><Baz /></AppContext.Provider></>)
}
export default Middle