const { SHOW_ALL } = VisibilityFilters是什么意思

Question

import { combineReducers } from 'redux';import { ADD_TODO, COMPLETE_TODO, SET_VISIBILITY_FILTER, VisibilityFilters } from '../action/action';const { SHOW_ALL } = VisibilityFilters;最后面这句的意思是：重新定义一个变量接收 VisibilityFilters，就是相当于重命名吗？这个是react+redux案例中的，SHOW_ALL是antion中VisibilityFilters中定义的：exports const VisibilityFilters = {SHOW_ALL: 'SHOW_ALL',SHOW_COMPLETED: 'SHOW_COMPLETED',SHOW_ACTIVE: 'SHOW_ACTIVE'    }我没明白的是这个写法到底是表达的是什么意思，VisibilityFilters在上面一句已经导入了，然后为什么有用一个大括号的形式呢