Jquery .find适用于xml但不适用于JSON

This works fine with XML

这适用于XML

$(document).ready(function() {
            $.ajax({
                type: "GET",
                url: "https://api.soundcloud.com/users/123/playlists.xml?client_id=ID",
                dataType: "xml",
                success: parse
            });
        });

        function parse(xml) {
           $(xml).find("playlists").each(function(){
                        //var title = $(this).find('title').text();
                        $("#catTitle").append($(this).text()+ "<br />"); 
                    });
        } 
        ​
$(document