Jqueryを使用してjson形式から「customers_firstname」のみを抽出するにはどうすればよいですか?
<?php echo json_encode($users) ?>
出力
[{"Customer":{"id":"13","customers_gender":"M","resumetest":"a15ff2aa27d616636b5bc30fac4dba38733f4e5f","created":"2013-01-29 13:49:06","modified":"2013-03-14 11:50:18","customers_firstname":"Gerald","customers_lastname":"Russ"}},{"Customer":{"id":"14","customers_gender":"F","resumetest":null,"created":"2013-01-29 15:41:23","modified":"2013-02-14 15:08:42","customers_firstname":"Jim","customers_lastname":"Carrie"}}]