how to use cross-domain to ajax load?

how to use cross-domain to ajax load?

i add header to "bbb.com" php server like this
  1. header("Access-Control-Allow-Origin: *");



and in aaa.com like this


  1. <a href="http://bbb.com/"  data-ajax="true" >test</a>


but is not ajax load, how can i do?

i need ajax load, sigh,  demo  please,