Spring boot ajax跨域请求，页面和java服务端的写法

private CorsConfiguration buildConfig() {     CorsConfiguration corsConfiguration = new CorsConfiguration();     corsConfiguration.addAllowedOrigin("*");     corsConfiguration.addAllowedHeader("*");     corsConfiguration.addAllowedMethod("*");     return corsConfiguration; } /** 跨域过滤器 * @return */ @Bean public CorsFilter corsFilter() {     UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();     source.registerCorsConfiguration("/**", buildConfig()); // 4     return new CorsFilter(source); }