1. 要將store注入到組件當(dāng)中，必須用<Provider store={store對(duì)象}></Provider>標(biāo)簽將組件包裹
   ??<Provider></Provider>組件引入自"react-redux"核心包

import { Provider } from 'react-redux';
import store from './store/index';

  <Provider store={store}>
    <App />
  </Provider>

2."react-redux"核心包為我們提供的鉤子函數(shù)

• ①useSelector(state => {}) 用來(lái)抓取store中存儲(chǔ)的state數(shù)據(jù)
  1.其中形參state獲取的是所有切片中的state集合
  2.函數(shù)中通過(guò)返回 state.name (name為store中各切片的屬性名)，來(lái)提取各切片數(shù)據(jù)
  3.此時(shí)，調(diào)用useSelector()函數(shù)會(huì)返回回調(diào)函數(shù)中的返回值，用一個(gè)變量接收該對(duì)象即可

  const student = useSelector(state => state.student)
  console.log(student.age);

• ②useDispatch()獲取派發(fā)器對(duì)象，此鉤子函數(shù)無(wú)需傳參

import { useDispatch } from "react-redux";
const dispatch = useDispatch()

引入切片頁(yè)面中暴露的action創(chuàng)建器(例如setName、setAge等)，然后作為調(diào)用dispatch時(shí)的參數(shù)即可

import { setName,setAge } from "./store";
  const nameHandler = () => {
    dispatch(setName({name:'楊玉蟬'}))
  }