ajax测试报错Access to XMLHttpRequest at '' from origin '' has been blocked by CORS policy: No 'Access-Co

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本文详细解释了跨域策略导致的访问错误，特别是在本地不同端口间的资源请求受阻情况。提供了通过使用Koa框架的cors中间件来解决跨域问题的方法。

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报错全文：Access to XMLHttpRequest at 'http://localhost:8080/' from origin 'http://127.0.0.1:8848' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

报错原因：本地不同端口也属于不同的域，因此需要跨域

实现跨域：通过script的src属性，或通过信任的服务器代理请求

可如图安装koa解决跨域问题

之后引入即可：

const cors = require("@koa/cors");

app.use(cors())

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