什么是表现和内容分离:
表现和内容分离是网页布局一直倡导的原则，也是当下非常流行的名词之一，可能很多开发人员虽然已经在很好的利用表现和内容分离原则进行网页布局，但是并没有对它有过多的注意，下面就结合代码实例简单介绍一下什么是表现和内容分离。
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></head> <body> <div style="width:200px;"> <font color="red">好好学习</font></div> </body> </html>
以上代码的表现和内容分离原则做的并不好，因为对文本控制的样式和网页结构都混合在一起。这样不但不利于网页的修改，而且还让网页内容不能够很好的展现于搜索引擎之下，不利于SEO。
以上代码修改如下:
<!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"> div { width:200px; color:red; } </style> </head> <body> <div>好好学习</div> </body> </html>
以上代码实现了内容和表现分离的布局。由上面两个代码可以得出，所谓”内容“，就是网页的骨架，如果排版网页的结构，而”表现“就是对”内容“的润色，比如div的宽度或者高度，字体的颜色大小等等。这样网页的内容就赤裸裸的展现在搜索引擎面前，也利于网站的优化。
原文地址是:http://www.softwhy.com/forum.php?mod=viewthread&tid=4775
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