创建Java文件，加注解@Configuration，然后实现WebMvcConfigurer 接口

package com.wdz.config;

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class MyCrosConfig implements WebMvcConfigurer {

    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**")
                .allowedOrigins("*")
                .allowedMethods("GET", "POST", "PUT", "DELETE", "OPTION")
                .allowCredentials(true)
                .maxAge(3600)
                .allowedHeaders("*");
    }
}