从json对象追加的重复条目

我从stackoverflow中搜索并实现了以下jquery代码，即从php中获取json对象并将其附加为li标记，但它附加了一个值的3个实例。示例代码为：

   var $childs = $('.childs');

            $.getJSON('common/db/fetchUniversity.php', function(data) {
            $(data).each(function() {
                var $element = $childs.clone().removeClass('childs').appendTo('#colleges');
                $element.attr('id', this.id+"u");
                $element.html("<a href='#' class='img'><strong><img alt='image' src='images/mit.jpg' style='height:40px; width:40px;' /></strong></a><div style='padding-right: 30px;'><h4 style='display:inline; margin:1px;'>"+this.name+"</h4><p style='display:inline;'>"+this.description+"</p></div><p style='margin:2px;'><a href='#' style='text-decoration: none;'><span class='ui-icon ui-icon-circle-plus' style='display:inline-block; vertical-align:middle;'></span>Follow</a></p><ul class='actions'><li class='remove'><a href='javascript:RemoveMe('#"+this.id+"u')'><span class='ui-icon ui-icon-closethick'>close</span></a></li></ul>");
                });
            });

            $.getJSON('common/db/fetchPeople.php', function(data1) {
                $(data1).each(function() {
                    var $element = $childs.clone().removeClass('childs').appendTo('#people');
                    $element.attr('id', this.id+"p");
                    $element.html("<a href='#' class='img'><strong><img alt='image' src='"+btoa(this.pic)+"' style='height:40px; width:40px;' /></strong></a><div style='padding-right: 30px;'><h4 style='display:inline; margin:1px;'>"+this.name+"</h4><p style='display:inline;'>"+this.job_desc+","+this.location+"</p></div><p style='margin:2px;'><a href='#' style='text-decoration: none;'><span class='ui-icon ui-icon-circle-plus' style='display:inline-block; vertical-align:middle;'></span>Follow</a></p><ul class='actions'><li class='remove'><a href='javascript:RemoveMe('#"+this.id+"p')'><span class='ui-icon ui-icon-closethick'>close</span></a></li></ul>");
                    });
                });

            $.getJSON('common/db/fetchGroups.php', function(data) {
                $(data2).each(function() {
                    var $element = $childs.clone().removeClass('childs').appendTo('#groups');
                    $element.attr('id', this.id+"g");
                    $element.html("<a href='#' class='img'><strong><img alt='image' src='images/groups/hbr.jpg' style='height:40px; width:40px;' /></strong></a><div style='padding-right: 30px;'><h4 style='display:inline; margin:1px;'>"+this.name+"</h4><p style='display:inline;'>"+this.job_desc+","+this.location+"</p></div><p style='margin:2px;'><a href='#' style='text-decoration: none;'><span class='ui-icon ui-icon-circle-plus' style='display:inline-block; vertical-align:middle;'></span>Follow</a></p><ul class='actions'><li class='remove'><a href='javascript:RemoveMe('#"+this.id+"g')'><span class='ui-icon ui-icon-closethick'>close</span></a></li></ul>");
                    });
                });

上面的代码获取了3个json对象，并将其附加到li标记中，但上面所有的代码都添加了3个单一值的实例。li标签在jquery手风琴中。

当我点击jsonphp文件时，它的返回是正确的，我想jquery代码对我做了一些错误的事情。请告诉我哪里出了问题。

json对象，在浏览器中输入时：-

[{"id":1,"name":"Stanford university","description":"One of the best university in the world"},{"id":2,"name":"Princeton University","description":"One of the best university in the world"},{"id":3,"name":"Yale University","description":"One of the best university in the world"},{"id":4,"name":"California University","description":"One of the best university in the world"},{"id":5,"name":"Yale University","description":"One of the best university in the world"},{"id":6,"name":"California University","description":"One of the best university in the world"},{"id":7,"name":"Princeton University","description":"One of the best university in the world"},{"id":8,"name":"Stanford university","description":"One of the best university in the world"},{"id":9,"name":"California University","description":"One of the best university in the world"},{"id":10,"name":"Princeton University","description":"One of the best university in the world"},{"id":11,"name":"Yale University","description":"One of the best university in the world"}]

上面的id:1值被追加了3次，所有值都会发生这种情况。