解决本地浏览器运行项目时的跨域问题-Access to XMLHttpRequest at ‘file:///D:/WebPracties/newSmartCity/data/funData.json

回答: 这个错误是由于浏览器的CORS策略引起的。CORS是一种安全机制，用于限制跨域请求。当浏览器发现请求的源与目标不在同一个域时，会发送一个预检请求，检查目标服务器是否允许跨域请求。如果目标服务器没有正确配置CORS头部，浏览器就会拒绝该请求，从而导致这个错误。\[1\]\[2\] 对于你提到的具体错误，'file:///D:/vue/vue-first/data.json'是一个本地文件路径，而'null'是请求的源。由于这是一个本地文件请求，而不是通过HTTP协议请求，所以CORS策略不适用于这种情况。因此，你可以通过将数据文件放在与你的应用程序相同的域中，或者使用服务器来提供数据，以避免这个错误。 #### 引用[.reference_title] - *1* [Access to XMLHttpRequest at ‘http://xxx‘ from origin ‘http://xxx‘ has been blocked by CORS ...](https://blog.csdn.net/qq_41470439/article/details/109361842)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^insertT0,239^v3^insert_chatgpt"}} ] [.reference_item] - *2* [前后端分离跨域问题Access to XMLHttpRequest at ‘http://localhos...has been blocked by CORS policy: ...](https://blog.csdn.net/qq_42416602/article/details/121731774)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^insertT0,239^v3^insert_chatgpt"}} ] [.reference_item] - *3* [Access to XMLHttpRequest at ‘http://xx‘ from origin ‘http://xx‘ has been blocked by CORS policy](https://blog.csdn.net/weixin_51603038/article/details/129319187)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^insertT0,239^v3^insert_chatgpt"}} ] [.reference_item] [ .reference_list ]