处理全局跨域问题，前后端对接

1.修改.en.development文件

VUE_APP_BASE_API = 'http://localhost:9999'

2.修改.js的请求路径

3.关掉vue.config.js中的mock.js

4.在后端添加一个配置类

@Configuration
public class MyCorsConfig {
    //处理全局跨域问题
    @Bean
    public CorsFilter corsFilter(){
        CorsConfiguration corsConfiguration = new CorsConfiguration();
        corsConfiguration.addAllowedOrigin("http://localhost:8888");
        corsConfiguration.setAllowCredentials(true);//传cookies
        corsConfiguration.addAllowedMethod("*");//允许的请求方式例如get，post,Head
        corsConfiguration.addAllowedHeader("*");//允许的头信息
        //过滤资源
        UrlBasedCorsConfigurationSource us = new UrlBasedCorsConfigurationSource();
        us.registerCorsConfiguration("/**",corsConfiguration);
        return new CorsFilter(us);
    }
}