关于redux 连接多个reducers 即combinereducers的问题？

Question

//下面是一个reducer
import { USER_EDIT } from '../actions/actions'
const editUsers = (state = USER_EDIT , action)=>{
    switch(action.type){
        case USER_EDIT:
            return Object.assign({},action.obj)
        default:
            return state
    }
}
export default editUsers
//下面也是一个reducer
const todos = (state = [] ,action)=>{
    switch(action.type){
        case USER_ADD :
    ...
    }
}
export default todos

//下面是combineReducers
import React , {combineReducers} from 'redux'
import todos from './todos'
import editUsers from './edit'


const lists = combineReducers({
    todos,
     editUsers
})

问题来了，调试时发现只有todos这个reducer生效，editUsers这个ruducer不起作用，这是为什么？

补充 actions export const USER_ADD = 'USER_ADD';
export const USER_EDIT = 'USER_EDIT'
export const USER_DEL = 'USER_DEL'
export const USER_LIST = 'USER_LIST'
export const USER_INFO = 'USER_INFO'
export const USER_EDIT_SUB = 'USER_EDIT_SUB'

let count = 0;

export function addUser(obj){
    obj.key = count++;
    return {
        type: USER_ADD,
        obj
    }
}
export function delUser(id){
    return {
        type: USER_DEL,
        id
    }
}
export function editUser(obj){
    return {
        type: USER_EDIT,
        obj
    }
}

Answer 1

调用代码方式都正确，条件太少，没法找到具体的错位，建议多去看看reducer官方文档，来进行对比哪儿代码使用错误，中文文档链接
http://uprogrammer.cn/redux-i...

Answer 2

import React from 'react'
import { combineReducers } from 'redux'

Answer 3

看着没问题啊，具体错误贴一下吧。。

Answer 4

目测有两个错误

1.import改为这样

import React from 'react'
import { combineReducers } from 'redux'

2.editUsers这个reducer的第一个参数，state = USER_EDIT 等于一个字符串，明显错误，默认state为{}或某个对象。还有Object.assign({}, state, action.obj)

const editUsers = (state = USER_EDIT , action)=>{
    switch(action.type){
        case USER_EDIT:
            return Object.assign({}, state, action.obj)
        default:
            return state
    }
}