未知的错误:还原器“构成疑问”在初始化过程中返回的未定义

Question

我正在尝试在redux中设置is Clicked的初始状态，但它总是抛出此错误

未接收的错误：降低器"已观察"在初始化期间返回的未定义。如果将传递给还原器的状态不确定，则必须明确返回初始状态。初始状态可能不确定。

这是我的代码

还原器

export default function reducerDomMethods(state={
isClicked: false,
}, action) {
switch (action.type) {
    case "CLICK_OPEN": {
        return {
            ...state,
            isClicked: true
        }
    }
    case "CLICK_CLOSE": {
        return{
            ...state,
            isClicked:false
        }
    }
        return state;
  }
}

动作

export function clicking(isClicked) {
return function (dispatch) {
            if( isClicked === true){
                dispatch({type: "CLICK_OPEN",isClicked: true});
            }else {
                dispatch({type: "CLICK_CLOSE",isClicked: false});
            }
   }
}

组合还原

    import { combineReducers } from "redux"
    import cityName from "./apiReducers"
    import nameOfCity from "./apiReducers"
    import weatherDescription from "./apiReducers"
    import windSpeed from "./apiReducers"
    import temperature from "./apiReducers"
    import maxTemperature from "./apiReducers"
    import minTemperature from "./apiReducers"
    import isClicked from "./manMethodsReducers"
    export default combineReducers({
        cityName,
        nameOfCity,
        weatherDescription,
        windSpeed,
        temperature,
        maxTemperature,
        minTemperature,
        isClicked
    })

商店

import { applyMiddleware, createStore } from "redux"
import logger from "redux-logger"
import thunk from "redux-thunk"
import promise from "redux-promise-middleware"
import reducer from "./reducers"
import reducerDomMethods from "./reducers"
const middleware = applyMiddleware(promise(), thunk, logger())
export default createStore( reducer , reducerDomMethods, middleware)

连接

import {connect} from "react-redux"

@connect（（店）=> {

return {
   nameOfCity:store.nameOfCity.nameOfCity,
   weatherDescription:store.weatherDescription.weatherDescription,
   windSpeed:store.windSpeed.windSpeed,
   temperature:store.temperature.temperature,
   maxTemperature:store.maxTemperature.maxTemperature,
   minTemperature:store.minTemperature.minTemperature,
   isClicked:store.isClicked.isClicked,
  }
 })

编辑：

我能够纠正它（商店中的错误没有给它提供特定的文件路径）。但是现在我得到

uck offult typeError：无法在reducerDommethods（manmethodsreducers.js：12）读取属性的"类型"

这是" switch（action.type）{"

在还原器中。我在下面移动了"返回"一个支架（如您先前指出的那样）

Answer 1

添加default案例并从那里返回状态。

Answer 2

您必须在默认情况下返回状态