reactjs - Redux : store. getState 返回未定义值

Question

为什么我的store.getState返回未定义的值!我对 ReactJS 和 Redux 很陌生，这里是我的代码

import {createStore} from 'redux';

const initialState = {
salary: 1000,
}

const reducer = (state=initialState, action) => {
switch (action.type) {
    case "ADD":
        state = {
            salary: state.salary+=action.payload,
        }
        break;

    default:
        break;
}
}

const store = createStore(reducer);

store.subscribe(() => {
console.log('Update salary: ', store.getState.salary);
})

store.dispatch({
type: "ADD",
payload: 2000,
});

控制台:更新工资:-未定义

谢谢。

Answer 1

getState是一个方法，调用它

console.log('Update salary: ', store.getState().salary);

你甚至应该修复你的 reducer

case "ADD":
   return {salary: state.salary + action.payload}

它必须返回新状态，您不返回任何内容