$.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