一、下载 React developertools 

下载地址:https://www.extfans.com/extension/lmhkpmbekcpmknklioeibfkpmmfibljd/

二、安装 

启动项目F12,点击  the instructions.

添加到store

//store
import {createStore} from 'redux';
import reducer from './reducer';

import React from "react";

const store=createStore(reducer, window.__REDUX_DEVTOOLS_EXTENSION__ && window.__REDUX_DEVTOOLS_EXTENSION__());

export default store;

三、测试

打开浏览器