異步按需加載，需要做以下兩個操作

1.在webpack.config中，output增加以下配置

output: {
    path: config.build.assetsRoot,
    publicPath: process.env.NODE_ENV === 'production' ? config.build.assetsPublicPath : config.dev.assetsPublicPath,
    filename: '[name].js',
    chunkFilename:"[name]-[hash:8].js"
  }

chunkFilename:"[name]-[hash:8].js"

2.配置router

參考：按需加載

//import Index from './components/Index'
const Index = resolve => require(['./components/Index'], resolve)
//import Draf from './components/Draf'
const Draf = resolve => require(['./components/Draf'], resolve)
//import CreateQues from './components/create/CreateQues'
const CreateQues = resolve => require(['./components/create/CreateQues'], resolve)
//import published from './components/published'
const published = resolve => require(['./components/published'], resolve)