项目为前后端分离,前段打包成x.html静态文件，结合x.css,x.js

egg众多配置都完成,跨域访问成功.....com/x.html#/user 可以成功获取到数据
问题来了，微信验证需要后端重定向
例this.ctx.redirect('https://open.weixin.qq.com/connect/oauth2/authorize?appid='+AppID+'&redirect_uri='+return_uri+'&response_type=code&scope='+scope+'&state=STATE#wechat_redirect');
这个return_uri的参数为...com/oauth,那么前端页面访问这个url会提示跨域

XMLHttpRequest cannot load https://open.weixin.qq.com/connect/oauth2/authorize?appid=xxxxxx&;redirect_uri=xxxxxxx&response_type=code&scope=snsapi_userinfo&state=STATE#wechat_redirect. Redirect from 'https://open.weixin.qq.com/connect/oauth2/authorize?appid=xxxxxx&redirect_uri=xxxxxxxxx&response_type=code&scope=snsapi_userinfo&state=STATE#wechat_redirect' to 'https://open.weixin.qq.com/connect/oauth2/authorize?appid=xxxxxx&redirect_uri=xxxxxxx&response_type=code&scope=snsapi_userinfo&state=STATE&connect_redirect=1#wechat_redirect' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'xxxxxxxx' is therefore not allowed access.


axios中也做了跨域设置，仍然无效，请教大牛！