<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==4)
$("ul").append("<li>" +sport["name"] + "</li>");
});
});
});
});
</script>
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