报如下错误：
    Access to XMLHttpRequest at ‘http://192.168.20.100:8090/expert/indInformation‘ from origin ‘http://127.0.0.1:8020‘ has been blocked by CORS policy: No ‘Access-Control-Allow-Origin’ header is present on the requested resource.

    看到：“ CORS policy: No ‘Access-Control-Allow-Origin’ header”，不用说，就是跨域问题。

    解决办法是
    1.先确认下自己的接口名字是否写错了。
    2.请后端开发人员在服务器配置一下。