classAppextendsReact.Component{
    state={
        name:'jack',
        age:19,
        gender:'男',
        count:1
    }
    render() {
        return<div >
            御劍乘風(fēng)來(lái),除魔天地間!
            <Child {...this.state}  hobby={[1,2,3,4]}></Child>
        </div>
    }

子組件：

  const Child = (props) => {
    console.log(props,99);
    return<div>
      御劍乘風(fēng)來(lái),除魔天地間!===Child======{props.count}
    </div>
    };

2、子向父?jìng)髦?/h2>

父組件

classAppextendsReact.Component{
    state={
        name:'jack',
        age:19,
        gender:'男',
        count:1
    }
  handle2=(msg)=>{
        console.log(msg,77); //  123
    }
    render() {
        return<div >
            御劍乘風(fēng)來(lái),除魔天地間!==
            <ChildgetMsg={this.handle2}></Child>
        </div>
    }

子組件：

  const Child = (props) => {
    console.log(props,99);
    var handle=()=>{
            console.log(111);
      props.getMsg('123')
        }
    return<div>
      御劍乘風(fēng)來(lái),除魔天地間!===Child======
        <buttononClick={handle}>child1</button></div>
    };

3、非父子傳值

child1 向 child2 傳值

思路：child 傳到app ,然后app傳到child2

classAppextendsReact.Component{
    state={
        name:'jack',
        age:19,
        gender:'男',
        count:1
    }
  handle2=(msg)=>{
        console.log(msg,77); //  123this.setState({
      count:this.state.count+msg
    })
    }
    render() {
        return<div >
            御劍乘風(fēng)來(lái),除魔天地間!==
            <ChildgetMsg={this.handle2} ></Child>
        <Child2count={this.state.count}></Child2>
        </div>
    }

子組件1：

const Child = (props) => {
    console.log(props,99);
    var handle=()=>{
            console.log(111);
      props.getMsg('123')
        }
    return<div>
      御劍乘風(fēng)來(lái),除魔天地間!===Child======
        <buttononClick={handle}>child1</button></div>
    };
  const Child2 = (props) => {
    console.log(props,99);
    var handle=()=>{
            console.log(111);
      props.getMsg('123')
        }
    return<div>
      御劍乘風(fēng)來(lái),除魔天地間!===Child======
        <buttononClick={handle}>child1</button></div>
    };

4、Context 方法傳值【類(lèi)似vue的 provide / inject】

步驟：

1- const {Provider,Consumer} = React.createContext()
2- Provider包裹父組件定義value是需要傳的值 ====<Provider value={this.state.count}>
3- Consumer包裹需要接收數(shù)據(jù)的組件 data接收數(shù)據(jù)

<Consumer >
            {data=>(
                    <div>
                        御劍乘風(fēng)來(lái),除魔天地間! ==Child2*****{data}                
                    </div>
            )}

代碼如下：

import React from 'react'const  {Provider,Consumer} = React.createContext()
const Child = (props) => {
    console.log(props,99);
    return <div>
        御劍乘風(fēng)來(lái),除魔天地間!===Child
</div>
}; 
classChild2extendsReact.Component{
    render() {
        return <div>
                <Consumer >
            {data=>(
                    <div>
                        御劍乘風(fēng)來(lái),除魔天地間! ==Child2*****{data}                
                    </div>
            )}
            </Consumer>
        </div>
    }
} 
classAppextendsReact.Component{
    state={
        name:'jack',
        age:19,
        gender:'男',
        count:1
    }
    render() {
        return <Provider value={this.state.count}>
            御劍乘風(fēng)來(lái),除魔天地間!=={this.state.name}
            <Child></Child>
            <Child2></Child2>
        </Provider>
    }
}
export default App

到此這篇關(guān)于react組件傳值的四種方法的文章就介紹到這了,更多相關(guān)react組件傳值內(nèi)容請(qǐng)搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家！

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