MiThink 记事本

如下：

XMLHttpRequest cannot load http://xxxx/xxx.php. Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:8888' is therefore not allowed access.

又或：

XMLHttpRequest cannot load http://xxxx/xxx.php. Method DELETE(PUT) is not allowed by Access-Control-Allow-Methods in preflight response.

再或：

XMLHttpRequest cannot load http://xxxx/xxx.php. Request header field Content-Type is not allowed by Access-Control-Allow-Headers in preflight response.

PHP解决办法如下：

header('Access-Control-Allow-Origin: *');
header("Access-Control-Allow-Headers: Content-Type");
header('Access-Control-Allow-Methods: GET，PUT, DELETE');

前台取到的数据不是JSON格式？

header('Content-type:application/json');