A: () => import(/* webpackChunkName:"a" */ '@/components/common/modal/A.vue')

B: () => import(/* webpackChunkName:"b" */ '@/components/common/modal/B.vue')

C: () => import(/* webpackChunkName:"c" */ '@/components/common/modal/C.vue')

vue加载了ABC三个组件，打包之后出现a~b~c.css和a~b~c.js的问题，这是什么原因呢