前后端分离后，解决跨域问题

https://blog.csdn.net/zhaokejin521/article/details/81007884

注意：

 如果使用了Spring Security，请确保在Spring Security已经启用CORS

@EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.cors().and()...
    }
}