Access to XMLHttpRequest at 'http://localhost:88/api/sys/menu/nav?t-1685520551741' from origin 'http://localhost:8001' has been blocked by CORS policy: The 'Access-Control-Allow-Origin' header contains multiple values 'http://localhost:8001, http://localhost:8001', but only one is allowed.

这是一个跨域资源共享（CORS）的错误，表明你正在尝试从一个不同于当前页面域的地方请求资源。在这种情况下，你正在从 localhost:8001 发出请求，但是服务器没有设置允许从该源访问资源的 CORS 头部。此外，错误消息还表明服务器返回了多个允许访问的源，而这是不允许的。要解决这个问题，你需要在服务器上配置 CORS 头部，以允许你的应用程序从 localhost:8001 发出请求。你可以使用 Access-Control-Allow-Origin 头部来指定允许访问的源，例如： Access-Control-Allow-Origin: http://localhost:8001 确保服务器只返回一个允许访问的源，而不是多个。这样应该可以解决你遇到的问题。

Access to XMLHttpRequest at 'http://localhost:8081/api/login' from origin 'http://localhost:8080'

根据提供的引用内容，你可以通过以下两种方式解决"Access to XMLHttpRequest at 'http://localhost:8081/api/login' from origin 'http://localhost:8080'?"的问题： 1. 在PHP中添加跨域配置： ```php header("Access-Control-Allow-Origin: *"); header("Access-Control-Allow-Methods: GET, POST, OPTIONS, DELETE"); header("Access-Control-Allow-Headers: DNT,X-Mx-ReqToken,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Accept-Language,Origin,Accept-Encoding,token"); if ($_SERVER['REQUEST_METHOD'] == 'OPTIONS') { exit(); } ``` 2. 在Spring Boot中添加跨域配置： ```java @Configuration public class AccessControlAllowOriginFilter implements WebMvcConfigurer { @Override public void addCorsMappings(CorsRegistry registry) { registry.addMapping("/*/**") .allowedHeaders("*") .allowedMethods("*") .maxAge(1800) .allowedOrigins("*"); } } ``` 这两种方式都是通过设置响应头来允许跨域请求。第一种方式是在PHP中添加相应的header头，第二种方式是在Spring Boot中添加一个过滤器类来配置跨域请求。

Access to XMLHttpRequest at 'http://localhost:3000/product' from origin 'http://localhost:8080' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

这个错误是由于浏览器中的同源策略所导致的。同源策略是浏览器的一种安全机制，它限制了一个源的文档或脚本如何能够与另一个源的资源进行交互。在你的情况中，你的应用程序运行在http://localhost:8080，而你的API运行在http://localhost:3000。这两个地址不属于同一个源，因此浏览器阻止了你的应用程序向API发送请求，以保护用户的数据安全。为了解决这个问题，你需要在API的响应头中添加Access-Control-Allow-Origin字段，来允许http://localhost:8080访问API。具体的做法是，在你的API的响应头中添加以下代码： ``` Access-Control-Allow-Origin: http://localhost:8080 ``` 这样，浏览器就会知道允许http://localhost:8080访问你的API，从而解决了跨域问题。

阅读全文

Access to XMLHttpRequest at 'http://localhost:8081/api/login' from origin 'http://localhost:8080'

Access to XMLHttpRequest at 'http://localhost:3000/product' from origin 'http://localhost:8080' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

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