做惯了后台程序的我们，是否对前端编程有兴趣么，通过CSS框架，使我们很容易的开发出基于Div+CSS布局的页面来，今天让我们了解下大名鼎鼎的blueprint CSS框架吧！
它的官方网站：http://www.blueprintcss.org/
首先你应该申明好CSS，这很简单，通过在页面的head区域加入如下引用即可：
Html代码
blueprint为我们提供了grid，form，print，reset，typography等多种css文件，我们重点来了解下布局。
在默认情况下，以950px作为宽度，比如我们可以利用如下代码，表示950px的居中Div：
Html代码
-
- lt;p>Here's my site!
你可以通过span-x来进行容器内列的定义，比如我们需要实现常见的顶部，main区域3列布局，可利用如下代码：
Html代码
-
- 顶部
- 左侧边栏
- 主体
- 右侧边栏
The naming rule of span-x is to specify the width. Each span-x is 40px higher than the previous one. The starting value is 30px. It can be found in the grid.css file as follows Definition:
Html code
- /* Use these classes to set the width of a column. */
- .span-1 {width: 30px;}
- .span-2 {width: 70px;} 110px;}
- ......
- .span-23 {width: 910px;}
- .span-24, div.span-24 { width: 950px; margin-right: 0; }
The definition of columns in the container may be nested. For example, in the following code, we define a top and middle , top layout, where the middle part is divided into left, middle and right layouts, and the middle part includes upper and lower layouts. The code is as follows:
Html code
- Header
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