解决方法
当然，这里是一个跨浏览器的方式：
<html>
<head>
<style type="text/css">
div.imageSub { position: relative; }
div.imageSub img { z-index: 1; }
div.imageSub div {
position: absolute;
left: 15%;
right: 15%;
bottom: 0;
padding: 4px;
height: 16px;
line-height: 16px;
text-align: center;
overflow: hidden;
}
div.imageSub div.blackbg {
z-index: 2;
background-color: #000;
-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=50)";
filter: alpha(opacity=50);
opacity: 0.5;
}
div.imageSub div.label {
z-index: 3;
color: white;
}
</style>
</head>
<body>
<div class="imageSub" style="width: 300px;"> <!-- Put Your Image Width -->
<img src="image.jpg" alt="Something" />
<div class="blackbg"></div>
<div class="label">Label Goes Here</div>
</div>
</body>
</html>
此方法不需要JavaScript，不会导致在IE中丢失ClearType文本，并且与Firefox，Safari，Opera，IE6,7,8 …兼容。不幸的是，它只适用于一行文本。如果您想要多行，请调整div.imageSub div的height和line-height属性，或者使用以下(修改CSS并要求指定两次标签)。
<html>
<head>
<style type="text/css">
div.imageSub { position: relative; }
div.imageSub img { z-index: 1; }
div.imageSub div {
position: absolute;
left: 15%;
right: 15%;
bottom: 0;
padding: 4px;
}
div.imageSub div.blackbg {
z-index: 2;
color: #000;
background-color: #000;
-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=50)";
filter: alpha(opacity=50);
opacity: 0.5;
}
div.imageSub div.label {
z-index: 3;
color: white;
}
</style>
</head>
<body>
<div class="imageSub" style="width: 300px;"> <!-- Put Your Image Width -->
<img src="image.jpg" alt="Something" />
<div class="blackbg">Label Goes Here</div>
<div class="label">Label Goes Here</div>
</div>
</body>
</html>
