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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                context: 實現跨層級的組件數據傳遞 ``` import React, { createContext } from 'react'; import logo from './logo.svg'; // 1. 引入 createContext() const BatteryContext = createContext(); function Leaf() { return ( // 數據消耗者 <BatteryContext.Consumer> { battery => <h1>Battery: {battery}</h1> } </BatteryContext.Consumer> ) } function Middle() { return ( <Leaf /> ) } class App extends React.Component { state = { battery: 60 } render() { const {battery} = this.state return ( // 數據提供者 <BatteryContext.Provider value={battery}> <button type="button" onClick={()=>this.setState({battery:50})}>點擊</button> <Middle /> </BatteryContext.Provider> ) } } export default App; ```
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                              哎呀哎呀视频在线观看