$.getJSON()方法，函数function参数data怎么理解

Question

  <script type="text/javascript">            $(function () {                $("#btnShow").bind("click", function () {                    var $this = $(this);                    $.getJSON("http://www.imooc.com/data/sport.json",function(data){                        $this.attr("disabled", "true");                        $.each(data, function (index, sport) {                            if(index==3)                            $("ul").append("<li>" + sport["name"] + "</li>");                        });                        });                })            });        </script>

Answer 1

你从http://www.imooc.com/data/sport.json获得了json数据，但你用什么来接收这些数据呢，data就是干这活的