如何动态给图片添加、隐藏按钮

1. 图片的代码：

   <img />

 

1. 按钮代码：

   <a >Hello World</a>

    

2. JavaScript代码：

   <script src="//cdn.bootcss.com/jquery/2.2.1/jquery.min.js "></script>

   <script src="//cdn.bootcss.com/bootstrap/3.3.5/js/bootstrap.min.js "></script>

    

    

   <script type="text/javascript">

               function showButton(obj, e) {

                   var $obj = $(obj);

                   var X = $obj.offset().top;

                   var Y = $obj.offset().left;

                   

                   $('#a1').css({

                       'position': 'absolute',

                       'top': X + 10,

                       'left': Y + 10,

                       'z-index': '10',

                       'display': 'block'

                   });

               }

    

               function hideButton(obj, e) {

                   var $obj = $(obj);

                   if (e.pageX > $obj.offset().left && e.pageX < $obj.offset().left + $obj.width() && e.pageY > $obj.offset().top && e.pageY < $obj.offset().top + $obj.height()) {

                       //console.log('在范围内' + e.pageX + ' ' + e.pageY);

                   } else {

                       //console.log('在范围外' + e.pageX + ' ' + e.pageY);

                       $('#a1').hide();

                   }

               }

           </script>

    

3. 效果如下

   

   当鼠标移到图片上呈现 按钮，移出时隐藏按钮。

   按钮使用Bootstrap样式