ajax、axios局部刷新，跨域不能重定向，且会报错。IP相同时不报错，可以返回重定向页面的代码。需要重定向时可以用form表单提交、location的href，这两种属于全部刷新

跨域解决
一：
response.setHeader("Access-Control-Allow-Origin", "*");
response.setHeader("Access-Control-Allow-Headers", "Content-Type, Content-Length, Authorization, Accept, " +
        "X-Requested-With , yourHeaderFeild");
response.setHeader("Access-Control-Allow-Methods", "PUT,POST,GET,DELETE,OPTIONS");
response.setHeader("X-Powered-By", " 3.2.1");
response.setHeader("Content-Type", "application/json;charset=utf-8");


二、注解 CrossOrigin