css实现的在图片上面添加文字说明_html/css_WEB-ITnose
css实现的在图片上面添加文字说明:
在一些图片效果中，图片上面会有文字说明，下面就通过代码实例介绍一下如何实现此效果。
代码实例如下:
<!DOCTYPE html><html><head><meta charset=" utf-8"><meta name="author" content="http://www.softwhy.com/" /><title>蚂蚁部落</title><style type="text/css">.thediv{ width:400px; height:200px; position:relative;}img{ width:400px; height:200px;}.thediv span{ width:400px; height:50px; display:block; text-align:center; line-height:50px; background-color:#333; filter:alpha(opacity=50); -moz-opacity:0.5; opacity:0.5; position:absolute; top:100px; color:red;}</style></head><body><div class="thediv"> <img src="/static/imghw/default1.png" data-src="mytest/demo/tree.jpg" class="lazy"/ alt="css实现的在图片上面添加文字说明_html/css_WEB-ITnose" > <span>蚂蚁部落欢迎您</span></div></body></html>
以上代码实现了我们的要求，图片上面有文字说明，并且具有半透明效果。实现原理非常的简单，也就是设置最外层div使用相对定位，然后设置span元素绝对定位，这样就可以以外层div为定位参考对象，然后设置top属性值就可以了。但是上面的并不完美，因为不但背景透明了，而且文字也透明了，这往往并不是我们希望看到的，代码如下:
<!DOCTYPE html><html><head><meta charset=" utf-8"><meta name="author" content="http://www.softwhy.com/" /><title>蚂蚁部落</title><style type="text/css">.thediv{ width:400px; height:200px; position:relative;}img{ width:400px; height:200px;}.thediv span{ width:400px; height:50px; display:block; text-align:center; line-height:50px; position:absolute; top:100px;}.content{ background-color:#333; filter:alpha(opacity=50); -moz-opacity:0.5; opacity:0.5;}.text{ color:red; z-index:100;}</style></head><body><div class="thediv"> <img src="/static/imghw/default1.png" data-src="mytest/demo/tree.jpg" class="lazy"/ alt="css实现的在图片上面添加文字说明_html/css_WEB-ITnose" > <span class="content"></span> <span class="text">蚂蚁部落欢迎您</span></div></body></html>以上代码实现了我们的要求，背景透明但是文本不透明。在上面的代码中，之所以文字透明，是因为透明属性具有继承性，子元素也会出现透明效果，这样就可以利用定位的方式将存放文本的span元素覆盖与半透明的span元素之上。
原文地址是:http://www.softwhy.com/forum.php?mod=viewthread&tid=12679
更多内容可以参阅:http://www.softwhy.com/divcss/
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