代码结构：

js代码：

drag_append:function(){
        var self = this;
        var appender = null;
        $('.ullis').find('.lis').on('mousedown',function(event){
            var e = window.event||arguments[0];
            var niu = $(this).clone();
            var  a = self.pic_change(niu.html());
            appender = $(a);
            var cur_Pos = $(this).offset();
            $('#for_drag').append(appender);
            $('#for_drag').css({'display':'block','top':cur_Pos.top,'left':cur_Pos.left,'position':'absolute'});
            $('#for_drag').css({'width':'94px','height':'94px','z-index':'51'});
            $('#for_drag').trigger(event);
            $('#for_drag').css('z-index','51');
            var posX = $('#for_drag').offset().left;
            var posY = $('#for_drag').offset().top;
            $(document).bind('mousemove',function(){
                var e  = window.event||arguments[0];
                var Nposx = e.clientX - posX;
                var Nposy = e.clientY - posY;
                $('#for_drag').css({'top':(Nposy+'px'),'left':(Nposx+'px')})

            })
            $(document).bind('mouseup',function(){
                $(document).unbind('mousemove');
                $(document).unbind('mouseup')
            })

        });

在拖动的时候总是出现禁止图标，没法拖动，请问该怎么破？
刚又看了一下，是拖动时如果碰到相邻元素，会出现禁止符号 ，该怎么破？？