大多数Ajax请求/框架应设置您可以用它来过滤阿贾克斯v非Ajax请求这个特殊的头。我用它来帮助确定在很多项目响应类型（JSON / HTML）：

Most Ajax requests/frameworks should set this particular header that you can use to filter Ajax v Non-ajax requests. I use this to help determine response type (json/html) in plenty of projects:

if( isset( $_SERVER['HTTP_X_REQUESTED_WITH'] ) && ( $_SERVER['HTTP_X_REQUESTED_WITH'] == 'XMLHttpRequest' ) )
{
	// allow access....
} else {
	// ignore....
}

编辑： 您可以在自己的Ajax请求在您的JavaScript code以下添加此自己：

edit: You can add this yourself in your own Ajax requests with the following in your javascript code:

var xhrobj = new XMLHttpRequest();
xhrobj.setRequestHeader("X-Requested-With", "XMLHttpRequest");