ajax 设置Access-Control-Allow-Origin实现跨域访问

设置单个域名

header('content-type:application:json;charset=utf8');  
header('Access-Control-Allow-Origin:*');  
header('Access-Control-Allow-Methods:POST');  
header('Access-Control-Allow-Headers:x-requested-with,content-type');  
  
echo json_encode($ret);  

多个域名：

header('content-type:application:json;charset=utf8');  
  
$origin = isset($_SERVER['HTTP_ORIGIN'])? $_SERVER['HTTP_ORIGIN'] : '';  
  
$allow_origin = array(  
    'http://www.client.com',  
    'http://www.client2.com'  
);  
  
if(in_array($origin, $allow_origin)){  
    header('Access-Control-Allow-Origin:'.$origin);  
    header('Access-Control-Allow-Methods:POST');  
    header('Access-Control-Allow-Headers:x-requested-with,content-type');  
}  
  
echo json_encode($ret);