why getjson function structured way?
$.getjson( url [, data ] [, success ] ) instead of returning object, i.e.:
var myjson = $.getjson( url [, data ])
because returns jqxhr object contains responsetext , responsexml properties, getresponseheader() method. when transport mechanism other xmlhttprequest (for example, script tag jsonp request) jqxhr object simulates native xhr functionality possible. basically, how know if request successful?
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