redux的基本使用

1.创建store 和 使用 reducer

import { createStore } from "redux"; 
const reducer = (pre = {
   name:'ss'
},action)=>{
   const newState = {...pre}
   console.log(pre)
   switch(action.type){
     case 'cxk':
        newState.name = '鸡你太美'
        return newState
     case 'nazi':
        newState.name = '希特勒万岁'
     case 'cccp':
         newState.name = '卢比扬卡包吃住'
      default:
        return pre      
   }
}
const store = createStore(reducer);  //创建一个store
export default store

2.派发dispatch

  const btn = ()=>{
    store.dispatch({   //点击派发
       type:'cxk'
    })
    setName('sss')  //异步更新
  }