js ajax接口提示跨域请求 PHP解决办法

四条代码，自己理解吧，万能方法！

header("Access-Control-Allow-Origin:*");
header("Access-Control-Allow-Methods:GET,POST");
header('Access-Control-Allow-Headers:x-requested-with,content-type');
header("Content-Type: text/html; charset=utf-8");