悠悠之家 -- 开发教程,开发笔记,分享!

本文通过设置Access-Control-Allow-Origin来实现跨域。

例如：客户端的域名是client.uoften.com，而请求的域名是server.uoften.com。

如果直接使用ajax访问，会有以下错误：

XMLHttpRequest cannot load https://server.uoften.com/server.php. No 'Access-Control-Allow-Origin' header is present on the requested resource.Origin 'https://client.uoften.com' is therefore not allowed access.

1、允许单个域名访问

指定某域名（https://client.uoften.com）跨域访问，则只需在https://server.uoften.com/server.php文件头部添加如下代码：

header('Access-Control-Allow-Origin:https://client.uoften.com');

2、允许多个域名访问

指定多个域名（https://client1.uoften.com、https://client2.uoften.com等）跨域访问，则只需在https://server.uoften.com/server.php文件头部添加如下代码：

$origin = isset($_SERVER['HTTP_ORIGIN'])? $_SERVER['HTTP_ORIGIN'] : '';  
  
$allow_origin = array(  
    'https://client1.uoften.com',  
    'https://client2.uoften.com'  
);  
  
if(in_array($origin, $allow_origin)){  
    header('Access-Control-Allow-Origin:'.$origin);       
} 

3、允许所有域名访问

允许所有域名访问则只需在https://server.uoften.com/server.php文件头部添加如下代码：

header('Access-Control-Allow-Origin:*');