問題:Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested
解決方法:服務器的攔截,tomcat服務器的conf文件下,web.xml添加
<filter>
<filter-name>CorsFilter</filter-name>
<filter-class>org.apache.catalina.filters.CorsFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>CorsFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>