Access to XMLHttpRequest at httpnnnncodingicu8080apilogout from origin httplocalhost5173 has been blocked by CORS policy No Access-Control-Allow-Origin header is present on the requested resource这段话什么

这段话意味着在从源地址为'http://localhost:5173'发送的XMLHttpRequest请求访问'http://nn.nncoding.icu:8080/api/logout'时，被请求的资源没有在响应头中包含'Access-Control-Allow-Origin'字段，因此被浏览器的CORS策略阻止了。