前后端分离下,egg如何设置跨域

Question

前端url是http://localhost:3333/index.html#/detail这样的格式访问后端,报跨域错误No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:3333' is therefore not allowed access.请问后端如何设置config.default.js里设置白名单：http://localhost:3333/index.html#/detail仍然无效。百思不得姐，求教高手！