import {createStore, applyMiddleware, compose} from 'redux'
import thunk from 'redux-thunk'
import {Reducer} from './Reducer'
// 创建一个store，store就是纯数据状态，
// 是数据存储器，只关心数据状态。
// 数据是要初始值的，本例中初始值只有一个数字。
// 而createStore(一参：是一个reducer；二参：是状态的初始值；三参：store enhancer，数据增强，没用过)
const initValues = 10;
const Store = createStore(Reducer, initValues, compose(applyMiddleware(thunk)));
export default Store;

import React from 'react'
//定义actionType类型
const makemoney = '挣钱';
const spendmoney = '花钱';
export function Reducer (state, action) {
  switch (action.type) {
    case makemoney:
      return state + 1;
    case spendmoney:
      return state - 1;
    default:
      return 10;
  }
}
//定义actions动作
export function MakeMoney () {
  return {type: makemoney}
}
export function SpendMoney () {
  return {type: spendmoney}
}

import React from 'react'
import Store from './Store'
import { MakeMoney, SpendMoney } from './Reducer'

class View extends React.Component{
  constructor (props) {
    super(props);
    this.handleItemDecrement = this.handleItemDecrement.bind(this);
    this.handleItemIncrement = this.handleItemIncrement.bind(this);
    this.state = {
      value: Store.getState(),
    };
    Store.subscribe(
        () => {
          this.setState({value: Store.getState()})
        }
    )
  }
  handleItemDecrement(spendmoney){
    const actionType = {type: spendmoney}
    Store.dispatch(MakeMoney(actionType))
  }
  handleItemIncrement(makemoney){
    const actionType = {type: makemoney}
    Store.dispatch(SpendMoney(actionType))
  }
  render () {
    const money = this.state.value;
    // console.log(money);
    return(
        <div>
          <h1>我现在有{money}块钱</h1>
          <button onClick={this.handleItemDecrement}>挣钱</button>
          <button onClick={this.handleItemIncrement}>花钱</button>
        </div>
    )
  }
}
export default View;