在前后端分离开发的时候会存在跨域的问题，假如采用拦截器进行缓存命中，实现的拦截器中并没有对跨域进行支持，需要对CORS跨域支持：
image.png
// 将data数据进行响应
response.setCharacterEncoding("UTF-8");
response.setContentType("application/json; charset=utf-8");
// 支持跨域
response.setHeader("Access-Control-Allow-Origin", "*");
response.setHeader("Access-Control-Allow-Methods", "GET,POST,PUT,DELETE,OPTIONS");
response.setHeader("Access-Control-Allow-Credentials", "true");
response.setHeader("Access-Control-Allow-Headers", "Content-Type,X-Token");
response.setHeader("Access-Control-Allow-Credentials", "true");
