location.hash cross-domain solution principle

When we request resources from a web page in one domain name to another domain name, the browser will send a preflight request to the server to determine whether the server supports cross-domain requests. After the server receives the preflight request, it can determine whether the cross-domain request is allowed based on the request header information. If it is allowed, it will return the corresponding response header, allowing the browser to make the cross-domain request successfully.

location.hash is an attribute in JavaScript that obtains the hash part of the URL. It is mainly used to handle URL anchor (fragment identifier) ​​changes on the client side. Therefore, it is not directly related to cross-domain requests.

Cross-domain requests involve requesting resources from a web page in one domain name to another domain name. Due to the limitations of the browser's same-origin policy, ordinary Ajax requests cannot cross domains. However, cross-domain requests can be implemented in other ways, such as using JSONP, CORS, etc.

When we request resources from a webpage of one domain name to another domain name, the browser will send a preflight request (Preflight request) to the server to determine whether the server supports cross-domain requests. The preflight request is usually an OPTIONS request, which contains some additional header information, such as Origin, Access-Control-Request-Method, etc. After the server receives the preflight request, it can determine whether the cross-domain request is allowed based on the request header information. If it is allowed, it will return the corresponding response header, allowing the browser to make the cross-domain request successfully.

Summary

location.hash has no direct relationship with cross-domain requests. location.hash is mainly used to obtain and process the anchor part of the URL, while cross-domain requests This can be achieved in other ways, such as using JSONP, CORS, etc.

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