javascript - js跨域请求问题

我在后端已经添加了header("Access-Control-Allow-Origin:*");，但是为什么前端使用js请求时还是出现

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://nichijou.org/x. (Reason: CORS header 'Access-Control-Allow-Origin' missing). 
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://nichijou.org/x. (Reason: CORS request failed).

回复内容：

我在后端已经添加了header("Access-Control-Allow-Origin:*");，但是为什么前端使用js请求时还是出现

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://nichijou.org/x. (Reason: CORS header 'Access-Control-Allow-Origin' missing). 
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://nichijou.org/x. (Reason: CORS request failed).

1. 很多浏览器都已经不支持使用 * 来设置 Access-Control-Allow-Origin 了，正常的做法是 header("Access-Control-Allow-Origin:".$_SERVER['HTTP_HOST']);

2. 如果需要传递 COOKIE 的话还需要搭配 Access-Control-Allow-Credentials: true 这个头使用。具体可以看文档：https://developer.mozilla.org/en-US/docs/Web/HTTP/Server-Side_Access_Control

什么浏览器啊，版本号都列出来