同一域上的CORS错误?

It is only considered to be the same if the protocol, host and port is the same: Same Origin Policy

如果你想启用它，你必须遵循 跨域资源共享 (cors)通过添加标题.Mozilla 有 示例

If you want to enable it you must follow Cross-Origin Resource Sharing (cors) by adding headers. Mozilla has examples

您需要在响应中添加 Access-Control-Allow-Origin 作为标题.允许所有人(您可能不这样做):

You need to add Access-Control-Allow-Origin as a header in your response. To allow everyone (you should probably NOT do that):

Access-Control-Allow-Origin: *

如果您需要支持多个来源(例如 example.com 和 www.example.com)，请设置 Access-Control-Allow-Origin 在您对请求中 Origin-header 的值的回复中(在您验证 Origin 已列入白名单之后.)

If you need to support multiple origins (for example both example.com and www.example.com), set the Access-Control-Allow-Origin in your reply to the value of the Origin-header from the request (after you verified that the Origin is white-listed.)

另外请注意，有些请求会发送一个带有 OPTION 方法的预检请求，因此如果您编写自己的代码，您也必须处理这些请求.请参阅 Mozilla 了解 示例.

Also note that some requests send a preflight-request, with an OPTION-method, so if you write your own code you must handle those requests too. See Mozilla for examples.

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