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用CSS的float属性创建三栏布局网页的方法
三栏布局是最常见的网页布局，主要页内容放在中间一栏，边上的两栏放置导航链接之类的内容。基本布局一般是标题之下放置三栏，三栏占据整个页面的宽度，最后在页的底端放置页脚，页脚也占据整个页面宽度。本文介绍一种用CSS的float和clear属性来获得三栏布局的方法。
绝大多数网页设计者都熟悉传统的网页设计技术，用这些技术可以生成带有表格、创建固定宽度布局或者“液态”(它可以根据用户浏览器窗口宽度自动伸缩)布局的网页。
基本方法
基本的布局包含五个div，即标题、页脚和三栏。标题和页脚占据整个页宽。左栏div和右栏div都是固定宽度的，并且用float属性来把它们挤压到浏览器窗口的左侧和右侧。中栏实际上占据了整个页宽，中栏的内容在左、右两栏之间“流淌”。由于中栏div的宽度并不固定，因此它可以根据浏览器窗口的改变进行必要的伸缩。中栏div的左侧和右侧的填充(padding)属性保证内容安排在一个整齐的栏中，甚至当它伸展到边栏(左栏或者右栏)的底端也是这样。
三栏布局的一个例子
XHTML代码：
以下是引用片段：
<body>
<div id="header">
<h1>Header</h1>
</div>
<div id="left">
Port side text...
</div>
<div id="right">
Starboard side text...
</div>
<div id="middle">
Middle column text...
</div>
<div id="footer">
Footer text...
</div>
</body>
下面是CSS代码：
以下是引用片段：
body {
margin: 0px;
padding: 0px;
}
div#header {
clear: both;
height: 50px;
background-color: aqua;
padding: 1px;
}
div#left {
float: left;
width: 150px;
background-color: red;
}
div#right {
float: right;
width: 150px;
background-color: green;
}
div#middle {
padding: 0px 160px 5px 160px;
margin: 0px;
background-color: silver;
}
div#footer {
clear: both;
background-color: yellow;
}
SELECT [t0].[a_id], [t0].[a_site], [t0].[a_model], [t0].[a_type], [t0].[a_special], [t0].[a_name], [t0].[a_from], [t0].[a_from_url], [t0].[a_author], [t0].[a_editor], [t0].[a_describe], [t0].[a_content], [t0].[a_create_date], [t0].[a_tag], [t0].[a_hits], [t0].[a_commend], [t0].[a_istop], [t0].[a_isimg], [t0].[a_cacheimg], [t0].[a_imgurls], [t0].[a_imgurl], [t0].[a_ismedia], [t0].[a_mediaurl], [t0].[a_iscomment], [t0].[a_isRecycle], [t0].[a_weight], [t0].[a_weights], [t0].[a_status], [t0].[a_url], [t0].[a_file_path], [t0].[a_contentfile], [t0].[a_comment], [t0].[a_ispass], [t0].[a_bury], [t0].[a_dig], [t0].[a_score], [t0].[a_rank], [t0].[a_diguser], [t0].[a_buryuser], [t0].[a_viewip], [t0].[a_lastviewdate], [t0].[a_neworimageorvideo], [t0].[class_id], [t0].[class_type], [t0].[class_name], [t0].[class_show_name], [t0].[class_parent_id], [t0].[class_id_path], [t0].[class_name_path], [t0].[class_show_name_path], [t0].[class_depth], [t0].[class_order], [t0].[class_content], [t0].[class_img], [t0].[a_model_name]
FROM [dbo].[mvc_content_view] AS [t0]
WHERE ([t0].[a_id] = @p0) AND ([t0].[a_type] = @p1) AND (NOT ([t0].[a_isRecycle] = 1))
-- @p0: Input BigInt (Size = 0; Prec = 0; Scale = 0) [4523]
-- @p1: Input BigInt (Size = 0; Prec = 0; Scale = 0) [233]
-- Context: SqlProvider(Sql2008) Model: AttributedMetaModel Build: 3.5.30729.1
SELECT TOP (1) [t0].[a_id], [t0].[a_name]
FROM [dbo].[mvc_content_view] AS [t0]
WHERE ([t0].[a_type] = @p0) AND ([t0].[a_id] < @p1) AND (NOT ([t0].[a_isRecycle] = 1))
ORDER BY [t0].[a_id] DESC
-- @p0: Input BigInt (Size = 0; Prec = 0; Scale = 0) [233]
-- @p1: Input BigInt (Size = 0; Prec = 0; Scale = 0) [4523]
-- Context: SqlProvider(Sql2008) Model: AttributedMetaModel Build: 3.5.30729.1
SELECT TOP (1) [t0].[a_id], [t0].[a_name]
FROM [dbo].[mvc_content_view] AS [t0]
WHERE ([t0].[a_type] = @p0) AND ([t0].[a_id] > @p1) AND (NOT ([t0].[a_isRecycle] = 1))
ORDER BY [t0].[a_id]
-- @p0: Input BigInt (Size = 0; Prec = 0; Scale = 0) [233]
-- @p1: Input BigInt (Size = 0; Prec = 0; Scale = 0) [4523]
-- Context: SqlProvider(Sql2008) Model: AttributedMetaModel Build: 3.5.30729.1
SELECT TOP (10) [t0].[a_id], [t0].[a_site], [t0].[a_model], [t0].[a_type], [t0].[a_special], [t0].[a_name], [t0].[a_from], [t0].[a_from_url], [t0].[a_author], [t0].[a_editor], [t0].[a_describe], [t0].[a_content], [t0].[a_create_date], [t0].[a_tag], [t0].[a_hits], [t0].[a_commend], [t0].[a_istop], [t0].[a_isimg], [t0].[a_cacheimg], [t0].[a_imgurls], [t0].[a_imgurl], [t0].[a_ismedia], [t0].[a_mediaurl], [t0].[a_iscomment], [t0].[a_isRecycle], [t0].[a_weight], [t0].[a_weights], [t0].[a_status], [t0].[a_url], [t0].[a_file_path], [t0].[a_contentfile], [t0].[a_comment], [t0].[a_ispass], [t0].[a_bury], [t0].[a_dig], [t0].[a_score], [t0].[a_rank], [t0].[a_diguser], [t0].[a_buryuser], [t0].[a_viewip], [t0].[a_lastviewdate], [t0].[a_neworimageorvideo], [t0].[class_id], [t0].[class_type], [t0].[class_name], [t0].[class_show_name], [t0].[class_parent_id], [t0].[class_id_path], [t0].[class_name_path], [t0].[class_show_name_path], [t0].[class_depth], [t0].[class_order], [t0].[class_content], [t0].[class_img], [t0].[a_model_name]
FROM [dbo].[mvc_content_view] AS [t0]
WHERE ([t0].[a_type] IN (@p0, @p1, @p2, @p3)) AND (NOT ([t0].[a_isRecycle] = 1))
ORDER BY [t0].[a_id] DESC
-- @p0: Input BigInt (Size = 0; Prec = 0; Scale = 0) [233]
-- @p1: Input BigInt (Size = 0; Prec = 0; Scale = 0) [253]
-- @p2: Input BigInt (Size = 0; Prec = 0; Scale = 0) [254]
-- @p3: Input BigInt (Size = 0; Prec = 0; Scale = 0) [255]
-- Context: SqlProvider(Sql2008) Model: AttributedMetaModel Build: 3.5.30729.1
SELECT TOP (10) [t0].[a_id], [t0].[a_site], [t0].[a_model], [t0].[a_type], [t0].[a_special], [t0].[a_name], [t0].[a_from], [t0].[a_from_url], [t0].[a_author], [t0].[a_editor], [t0].[a_describe], [t0].[a_content], [t0].[a_create_date], [t0].[a_tag], [t0].[a_hits], [t0].[a_commend], [t0].[a_istop], [t0].[a_isimg], [t0].[a_cacheimg], [t0].[a_imgurls], [t0].[a_imgurl], [t0].[a_ismedia], [t0].[a_mediaurl], [t0].[a_iscomment], [t0].[a_isRecycle], [t0].[a_weight], [t0].[a_weights], [t0].[a_status], [t0].[a_url], [t0].[a_file_path], [t0].[a_contentfile], [t0].[a_comment], [t0].[a_ispass], [t0].[a_bury], [t0].[a_dig], [t0].[a_score], [t0].[a_rank], [t0].[a_diguser], [t0].[a_buryuser], [t0].[a_viewip], [t0].[a_lastviewdate], [t0].[a_neworimageorvideo], [t0].[class_id], [t0].[class_type], [t0].[class_name], [t0].[class_show_name], [t0].[class_parent_id], [t0].[class_id_path], [t0].[class_name_path], [t0].[class_show_name_path], [t0].[class_depth], [t0].[class_order], [t0].[class_content], [t0].[class_img], [t0].[a_model_name]
FROM [dbo].[mvc_content_view] AS [t0]
WHERE ([t0].[a_type] IN (@p0, @p1, @p2, @p3)) AND (NOT ([t0].[a_isRecycle] = 1))
ORDER BY [t0].[a_id] DESC
-- @p0: Input BigInt (Size = 0; Prec = 0; Scale = 0) [233]
-- @p1: Input BigInt (Size = 0; Prec = 0; Scale = 0) [253]
-- @p2: Input BigInt (Size = 0; Prec = 0; Scale = 0) [254]
-- @p3: Input BigInt (Size = 0; Prec = 0; Scale = 0) [255]
-- Context: SqlProvider(Sql2008) Model: AttributedMetaModel Build: 3.5.30729.1
SELECT TOP (10) [t0].[a_id], [t0].[a_site], [t0].[a_model], [t0].[a_type], [t0].[a_special], [t0].[a_name], [t0].[a_from], [t0].[a_from_url], [t0].[a_author], [t0].[a_editor], [t0].[a_describe], [t0].[a_content], [t0].[a_create_date], [t0].[a_tag], [t0].[a_hits], [t0].[a_commend], [t0].[a_istop], [t0].[a_isimg], [t0].[a_cacheimg], [t0].[a_imgurls], [t0].[a_imgurl], [t0].[a_ismedia], [t0].[a_mediaurl], [t0].[a_iscomment], [t0].[a_isRecycle], [t0].[a_weight], [t0].[a_weights], [t0].[a_status], [t0].[a_url], [t0].[a_file_path], [t0].[a_contentfile], [t0].[a_comment], [t0].[a_ispass], [t0].[a_bury], [t0].[a_dig], [t0].[a_score], [t0].[a_rank], [t0].[a_diguser], [t0].[a_buryuser], [t0].[a_viewip], [t0].[a_lastviewdate], [t0].[a_neworimageorvideo], [t0].[class_id], [t0].[class_type], [t0].[class_name], [t0].[class_show_name], [t0].[class_parent_id], [t0].[class_id_path], [t0].[class_name_path], [t0].[class_show_name_path], [t0].[class_depth], [t0].[class_order], [t0].[class_content], [t0].[class_img], [t0].[a_model_name]
FROM [dbo].[mvc_content_view] AS [t0]
WHERE ([t0].[a_type] IN (@p0, @p1, @p2, @p3)) AND (NOT ([t0].[a_isRecycle] = 1))
ORDER BY [t0].[a_hits] DESC, [t0].[a_id] DESC
-- @p0: Input BigInt (Size = 0; Prec = 0; Scale = 0) [233]
-- @p1: Input BigInt (Size = 0; Prec = 0; Scale = 0) [253]
-- @p2: Input BigInt (Size = 0; Prec = 0; Scale = 0) [254]
-- @p3: Input BigInt (Size = 0; Prec = 0; Scale = 0) [255]
-- Context: SqlProvider(Sql2008) Model: AttributedMetaModel Build: 3.5.30729.1
