has been blocked by CORS policy:

CORS是跨域资源共享（Cross-Origin Resource Sharing）的缩写。它是一种机制，用于控制在一个域名下的网页应用能否访问另一个域名下的资源。当浏览器发起跨域请求时，如果被请求的资源服务器没有正确设置CORS相关的响应头，浏览器会阻止该请求，提示"has been blocked by CORS policy"的错误信息，其中"No 'Access-Control-Allow-Origin' header is present on the requested resource"表示请求头中缺少"Access-Control-Allow-Origin"字段。这通常是出于安全考虑，防止未经授权的网站访问数据。要解决这个问题，服务器端需要设置响应头中的"Access-Control-Allow-Origin"字段，指定允许访问的域名或者使用通配符"*"表示允许所有域名进行访问。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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