Access to XMLHttpRequest at 'http://localhost:8090/user/getotp' from origin 'null' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

Access to XMLHttpRequest at 'http://localhost:8090/user/getotp' from origin 'null' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
ajax跨域请求错误
```
解决：
　　springboot中：
　　　　加注解 @CrossOrigin
```
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原文地址：https://www.cnblogs.com/JimShi/p/11912542.html