react 爷爷组件件传递给孙子组件

爷爷组件

import React, { Component } from "react";
import "./App.css";
import TestHanderClick from "./components/TestHanderClick";
import proptypeskey from "prop-types";

export class App extends Component {
  // 也是人家提供的,不可以改变  传递给孙子组件的类型(必须写)
  // 爷爷组件传递给孙子组件,依赖于  prop-types;(验证参数的格式)
  static childContextTypes = {
    title: proptypeskey.string,
  };

  // getChildContext是人家提供的,设置穿度的内容(必须写)
  getChildContext() {
    return {
      title: "营业员==>给孙子的",
    };
  }

  render() {
    return (
      <div className="App">
        {/* 父组件传递给子组件的值 */}
        <TestHanderClick></TestHanderClick>
      </div>
    );
  }
}

export default App;

父亲组件(父亲组件啥子都不用干)


import React, { Component } from "react";
import "./base.css";
import SuoZi from "./SuoZi";

// 父组件  
export class TestHanderClick extends Component {
  //  static defaultProps是默认的写法,人家规定这样写的,你的默认值
  static defaultProps = {
    bg: "pink",
    wi: "400px",
    he: "200px",
  };

  render() {
    return (
      // 使用值
      <div
        style={{
          background: this.props.bg,
          width: this.props.wi,
          height: this.props.he,
        }}
      >
        <SuoZi></SuoZi>
      </div>
    );
  }
}

export default TestHanderClick;

孙子组件

import React, { Component } from "react";

// 引入验证格式类型的插件
import proptypeskey from "prop-types";

export class SuoZi extends Component {
  // 也是人家提供的,不可以改变(必须写)
  static contextTypes = {
    title: proptypeskey.string,
  };

  render() {
    return (
      <div>
        {/* 获取值 */}
        <p>爷爷=={this.context.title} </p>
      </div>
    );
  }
}

export default SuoZi;

posted @ 2020-08-21 20:37  何人陪我共长生  阅读(1301)  评论(0编辑  收藏  举报