如何将ajax请求返回的Json格式数据循环输出成table形式

<script>
$(function(){
$('#test').click(function(){
$.ajax({
url:'__APP__/Article/jsonTest',
type:'post',
success:function(data){
var item;
$.each(data,function(i,result){
item = "<tr><td>"+result['num']+"</td><td>"+result['title']+"</td><td>"+result['credate']+"</td><td>操作</td></tr>";
$('.table').append(item);
});
}
})
})
});
</script>

$list = $File->group('num')->order('id desc')->limit($Page->firstRow.','.$Page->listRows)->select();
$this->ajaxReturn($list,'JSON');

<table class="table table-striped table-bordered table-condensed">
<tr><th>编号</th><th>名称</th><th>创建时间</th><th>操作</th></tr>
</table>