axios跨域问题：

会一直报错：“http://127.0.0.1:8848’ has been blocked by CORS policy: No ‘Access-Control-Allow-Origin’ header”
因为使用了前后端分离开发，跨域访问了，解决方案：需要配置springboot内置tomcat允许跨域访问。

package com.lzhhuo.shop.config;import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
import org.springframework.web.filter.CorsFilter;/*** 解决跨域问题*/
@Configuration
public class CorsConfig {private CorsConfiguration buildConfig() {CorsConfiguration corsConfiguration = new CorsConfiguration();corsConfiguration.addAllowedOrigin("*"); //允许任何域名corsConfiguration.addAllowedHeader("*"); //允许任何头corsConfiguration.addAllowedMethod("*"); //允许任何方法return corsConfiguration;}@Beanpublic CorsFilter corsFilter() {UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();source.registerCorsConfiguration("/**", buildConfig()); //注册return new CorsFilter(source);}
}

注：

后台接收数据时应加入@RequestBody注解。

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“http://127.0.0.1:8888' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header”

axios跨域问题：

注：

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