开发中跨域问题解决

当实现前后端分离，前端调用接口，浏览器给出的错误

Access to XMLHttpRequest at 'http://192.168.31.30:8000/Host/' from origin 'http://localhost:8080' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

No 'Access-Control-Allow-Origin' header is present on the requested resource.
意思就是说，所请求的资源没有Access-Control-Allow-Origin

• 带上标头-即可解决

get.addHeader(  "Access-Control-Allow-Origin"，"*");//允许所有来源访同
get.addHeader(  "Access-Control-Allow-Method","POST,GET");//允许访问的方式

• 使用浏览器插件快速解决

插件就帮我们处理好了