var CAT = {
  //[{id: '', name: '', data: [{id: '', name: '', data:[{id: '', name: ''}]},{}, ...]}, {} ...]
  data: [],
  url: function(){
    return 'http://upload.taobao.com/auction/json/reload_cats.htm"Content-type","application/x-www-form-urlencoded");
    xhr.send(post_data);
    xhr.onreadystatechange=function(){
      if (xhr.readyState==4 && xhr.status==200){
        result = JSON.parse(xhr.responseText);
        func(result);
      }else if(xhr.readyState==4 && (!xhr.status==200)){
        console.log('Ajax Return Error!');
      }
    }
  }
};
CAT.init();