Example4.jsx
import React, { useState,createContext,useContext} from 'react'
const CountContext = createContext();
function Counter(){
let count = useContext(CountContext)
return (
<h2>{count}</h2>
)
}
function Example4(){
const [count, setCount] = useState(0); //数组第一个是0 第二是一个函数
return (
<div>
<p>You Clicked {count} times</p>
<button onClick={() => {setCount(count+1)}}>Click me</button>
<CountContext.Provider>
<Counter/>
</CountContext.Provider>
</div>
)
}
export default Example4
App.JSX
import React, { Component } from 'react'
// import Count from "./components/Count/index"
// import HooksDemo from "./components/Hooks/index"
import Example4 from "./components/Hooks/Example4"
export default class App extends Component {
render() {
return (
<div>
{/* <Count></Count> */}
{/* <HooksDemo></HooksDemo> */}
<Example4></Example4>
</div>
)
}
}
运行结果
原文地址:https://www.cnblogs.com/malong1992/p/15317850.html
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