点击弹出

<script type="text/javascript">
        $(function() {
            //动画速度 
            var speed = 500;

            //绑定事件处理

            $("#aDown").click(function(event) {
                //取消事件冒泡 
                event.stopPropagation();
                //设置弹出层位置
                var offset = $(event.target).offset();
                //设置弹出层位置
                $("#divPop").css({ "top": offset.top + $(event.target).height(), "left": offset.left, "position": "absolute", "z-index": 1000 });
                //动画显示
                $("#divPop").show(speed);

            });

            //单击空白区域隐藏弹出层

            $(document).click(function(event) { $("#divPop").hide(speed); });

        }); 

   

    </script>