php - My ajax JSON object is recognized as "Undefined" -

I have trouble with my Ajax call when I try to warn the result, the result is undefined .

Both alerts are result of being undefined. I'm not sure if I'm coding it correctly, please help me.

Q: If I am using it incorrectly, how do I use the skill property / index?

JQUERY / JSCRIPT

  $ (document) .ready (function () {// Change on skill sort $ ('# order_by' ). 'Change', function () {$ .ajax ({type: "post", url: "sort_skill_be.php", datatype: "jason", data: {skill: this.value}} done (work) (Result) {Warning (Results [0] .skill);})});});   
  PHP file: This method receives a statement and puts an "object" array in an aggregate array.   
  function helpFetchPostInfo ($ Stmt) {$ result = $ stmt-> Fatch ALL (); $ Recent_posts = Array (); $ Line ['steam'], 'skill' => $ Line ($ result as $ line) {$ post = array} ('username' = & gt; $ row ['username'], 'steam' = & gt; ['skill'], 'description' = & Gt; $ line ['description'], 'date' = & gt; $ line ['date'],); Array_press ($ recent_page, $ post); } Return json_encode ($ recent_posts); }   
 Thanks very much for the help  
  function sort socket ($ skill) {// if all the skills are displayed normally Posts are selected (if $ skill == 'all') {displayPosts (); Go out; } $ Db = connect (); $ Sql ​​= "SELECT * Users · Users · IDUsers · Join posts on Posts · Posts · FQEE Posts · No FQU and Users. Skill: = Date by skill DCSC"; $ Stmt = $ db- & gt; Ready ($ sql); $ Stmt- & gt; Execute (array (': skill' => $ skill)); If ($ stmt-> rowCount () == 0) {// nothing was set back ($ _ session ['recent_posts']); // Reset the session to terms, if no terms appear} and {$ recent_posts = helpFetchPostInfo ($ stmt); $ Recent_posts return; }}   
 The sequential skill is being called in a separate php file, which is sorted by ctrl_b.f. It is said, that a selection is changed when jquery is called.  
  & lt ;? Php session_start (); Included 'database.php'; $ Skill_sort = $ _POST ['skill']; SortSkill ($ skill_sort); Header ('location: index.php'); ? & Gt;   
 Edit: jquery added JSON datatype  
 Now my problem is that the alert is no longer being called.  
  
 
 
 It looks like you type your  AJAX  method in  dataType < / Code> attribute are not provided.  
  Type the data: "Jason",   
 Do this either or  parse your result  before accessing it From  JSON   
 I do not see any problems trying to reach the object.