交叉原始标题存在但仍然出错

Question

我们希望在iframe中显示我们网站的博客页面。阅读This我设置了：

 <?php /** @package WordPress @subpackage Default_Theme  **/
 header("Access-Control-Allow-Origin: *"); 
 ?>

在标题中设置访问控制。

然而，当我尝试：

<iframe src="https://get10things.com/blog" style="border: 0; width: 100%; height: 100%"></iframe>

我仍然收到错误：

 Uncaught DOMException: Blocked a frame with origin      "https://get10things.com" from accessing a cross-origin frame.
at https://get10things.com/wp-content/themes/10t2016_v1/js/script.js?201607261750:2:20942
at https://get10things.com/wp-content/themes/10t2016_v1/js/script.js?201607261750:2:20739
at https://get10things.com/wp-content/themes/10t2016_v1/js/script.js?201607261750:2:20772

我做错了什么？