transition与visibility与淡入淡出效果

CSS代码：

.trans-fadeout{
   -webkit-transition:all 0.5s linear;
   -moz-transition:all 0.5s linear;
   -ms-transition:all 0.5s linear;
   -o-transition:all 0.5s linear;
   transition:all 0.5s linear;
}
.image-fadeout{position:absolute; margin-top:20px; visibility:hidden; opacity:0;}
.hover-fadeout:hover .image-fadeout{ visibility:visible; opacity:1; }

HTML代码：

<div class="hover-fadeout">
    <img src="example.jpg" class="trans-fadeout image-fadeout" />
    <a href="#">经过我显示图片</a>
</div>