text: import { fromJS } from 'immutable';
  import * as constants from './constants';
  
  const defaultState = fromJS({
      title: '',
      content:""
  })
  
  export default (state = defaultState, action ) => {
      switch(action.type){
          case constants.CHANGE_DETAIL:
              return state.merge({
                  title: action.title,
                  content: action.content
              })
          default:
              return state;
      }
  }