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css属性之媒体（Media）类型
样式单的一个最重要的特点就是它可以作用于多种媒体，比如页面、屏幕、电子合成器等等。特定的属性只能作用于特定的媒体，如"font-size"属性只对可卷动的媒体类型有效(屏幕)。
声明一个媒体属性可以用@import或@media引入：
以下是引用片段：
@import url(loudvoice.css) speech;
@media print {
/* style sheet for print goes here */
}
也可以在文档标记中引入媒体：
以下是引用片段：
<link rel="stylesheet" type="text/css" media="print" href="foo.css">
可以看出，@import和@media的区别在于，前者引入外部的样式单用于媒体类型，后者直接引入媒体属性。@import的使用方法是@import加样式单文件的URL地址再加媒体类型，可以多个媒体共用一个样式单，媒体类型之间用"，"分割符分开。@media用法则是把媒体类型放在前面，其他规则和rule-set基本一样。下面列出各种媒体类型：
SCREEN：指计算机屏幕。
PRINT：指用于打印机的不透明介质。
PROJECTION：指用于显示的项目。
BRAILLE：盲文系统，指有触觉效果的印刷品。
AURAL：指语音电子合成器。
TV：指电视类型的媒体。
HANDHELD：指手持式显示设备(小屏幕，单色)
ALL：适合于所有媒体。
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) [4512]
-- @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) [4512]
-- 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) [4512]
-- 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
