一.通配选择符(Universal Selector):
语法：*
说明：1.*表示通配符,表示所有的
2.格式:*{样式列表}
3.用于整个页面或网站字体、边距、背景等
例子：
1 <!DOCTYPE html > 2 <html xmlns="http://www.w3.org/1999/xhtml"> 3 <head> 4 <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> 5 <title>通配选择符</title> 6 <style type="text/css"> 7 * 8 {/**定义网页中所有元素字体、边距样式*/ 9 margin:0px;10 font-size:28px;11 font-family: "华文彩云";12 }13 div *14 {/**定义div中所有元素字体、边距样式*/15 margin:10px;16 color:#FF0000;17 }18 </style>19 </head> 20 <body>21 普通文本22 <p>段落文本</p>23 <span>span内联文本</span>24 <div>div文本25 <div>div子div元素中的文本</div>26 <p>div中段落文本</p>27 <span>div中span内联文本</span>28 </div>29 </body>30 </html> 输出如下：
==============================================================================================================================================
二. 类型选择符（Type Selectors）：
语法：E1
说明：1.类型选择符用于设定特定HTML元素样式
2.元素名称不区分大小写
3.格式:HTML元素名{样式列表}
例子：
1 <!DOCTYPE html > 2 <html xmlns="http://www.w3.org/1999/xhtml"> 3 <head> 4 <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> 5 <title>类型选择符</title> 6 <style type="text/css"> 7 p 8 { 9 font-size:1cm;10 font-style:oblique;11 }12 div13 {14 color:#FFFF00;15 font-family:"方正黄草简体";16 font-size:1in;17 }18 </style>19 </head>20 <body>21 <p>类型选择符</p>22 <div>类型选择符</div>23 </body>24 </html> 输出如下：
=================================================================================================================================
三.属性选择符（Attribute Selectors）：
语法：1. E1[attr]
2. E1[attr=value]
3. E1[attr~=value]
4. E1[attr|=value]
说明：用于定义特定属性值的HTML元素样式.
例子：
1 <!DOCTYPE html > 2 <html xmlns="http://www.w3.org/1999/xhtml"> 3 <head> 4 <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> 5 <title>属性选择符</title> 6 <style type="text/css"> 7 input[type] 8 { 9 border:2px solid #E81D2B;10 }11 input[name='button']12 {13 border:1px solid #868686;14 height:25px;15 width:60px;16 }17 </style>18 </head>19 <body>20 <form action="#">21 <div>用户名:<input type="text" name="name"/></div>22 <div>密码:<input type="password" name="password"/></div>23 <div>确认密码:<input type="password" name="confirmPWD"/></div>24 <div>电子邮箱:<input type="text" name="email"/></div>25 <div><input type="submit" value="用户注册" name="button"/> 26 <input type="reset" value="重新填写" name="button"/></div>27 </form>28 </body>29 </html> 输出如下：
=================================================================================================================================
四.包含选择符（Descendant Selectors）：
语法： E1 E2
说明：1.用于子元素对父元素样式的扩展
2. 格式:父选择符子选择符{样式列表}
3.注意HTML元素包含关系
例子：
1 <!DOCTYPE html > 2 <html xmlns="http://www.w3.org/1999/xhtml"> 3 <head> 4 <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> 5 <title>包含选择符</title> 6 <style type="text/css"> 7 div p 8 { 9 font-size:32px ;10 font-weight:lighter;11 }12 div p span13 {14 color:#FF0000 ;15 text-shadow: 20px 10px 2px #E81D2B; 16 }17 </style>18 </head>19 <body>20 <p>包含选择符</p>21 <div>22 <p> 包含选择符23 <span>包含选择符</span>24 </p>25 </div>26 </body>27 </html> 输出如下：
=================================================================================================================================
五.子对象选择符（Child Selectors）：
语法： E1>E2
说明：1.用于子对象元素对父对象元素样式扩展
2. 格式:父对象选择符>子对象HTML元素名称{样式列表}
3.注意和包含选择符的区别
4.使用情况较少,通常可以用包含选择符取代
例子：
1 <!DOCTYPE html > 2 <html > 3 <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> 4 <title>子对象选择符</title> 5 <style type="text/css"> 6 /** 7 常用子对象选择符 8 table>tbody>tr>td 9 ul>li10 ol>li11 div>子div12 dl>dt13 dl>dd14 form>input15 */16 ul > li17 {18 font-size:18px;19 color:#4F87C2;20 }21 table>td22 {23 font-style:italic;24 font-weight:bolder;25 }26 dl>dd27 {28 font-weight:bolder;29 }30 div >div{31 font-weight:bolder;32 }33 form> input34 {35 border:2px solid #4F87C2;36 }37 </style>38 </head>39 <body>40 水果列表41 <ul >42 <li>香蕉</li>43 <li>苹果</li>44 <li>桃子</li>45 </ul>46 <table > 47 <tr>48 <td>单元格一</td>49 <td>单元格一</td>50 </tr>51 </table>52 三大球类运动53 <dl>54 <dt>足球</dt>55 <dd>全世界第一大球类运动</dd>56 <dt>篮球</dt>57 <dd>全世界第二大球类运动</dd>58 <dt>排球</dt>59 <dd>全世界第三大球类运动</dd>60 </dl>61 <div>第一层div<div>第二层div</div></div>62 <form>63 <input type="button" value="普通按钮"/>64 </form>65 66 </body>67 </html> 输出如下：
=================================================================================================================================
六.ID选择符（ID Selectors）：
语法： #sID
说明：1.用于定义唯一ID属性值元素样式
2. 格式:#选择符名称{样式列表}
3.选择符名称必须和元素ID属性值完成相同,且区分大小写
例子：
1 <!DOCTYPE html > 2 <html xmlns="http://www.w3.org/1999/xhtml"> 3 <head> 4 <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> 5 <title>ID选择符</title> 6 <style type="text/css"> 7 #name 8 { 9 border:2px solid #4F87C2;10 width:200px;11 height:30px;12 }13 </style>14 </head>15 <body>16 <form action="#">17 文本框一:18 <input type="text" name="name" id="name"/>19 文本框二:20 <input type="text" name="address"/>21 </form>22 </body>23 </html> 输出如下：
=================================================================================================================================
七.类选择符（Class Selectors）：
语法：E1.className
说明： 1.用于选择特定类选择符
2. 可以选择一个或以上的类选择符
3.区分大小写
例子：
1 <!DOCTYPE html > 2 <html xmlns="http://www.w3.org/1999/xhtml"> 3 <head> 4 <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> 5 <title>类选择符</title> 6 <style type="text/css"> 7 .myButton 8 { 9 border:2px solid #4F87C2;10 width:200px;11 height:30px;12 }13 </style>14 </head>15 <body>16 <form action="#">17 文本框一:18 <input type="text" name="name" class="myButton"/>19 文本框二:20 <input type="text" name="address" class="mybutton"/>21 </form>22 </body>23 </html> 输出如下：
=================================================================================================================================
八.（选择符混合使用）选择符分组（Grouping）：
语法：E1.E2.E3
说明： 1.常见的有类型选择符与类选择符 ；格式:html元素名.类选择符名称,中间不能有空格
2.其它选择与包含选择符；最常见使用方式
例子：
1 <!DOCTYPE html > 2 <html xmlns="http://www.w3.org/1999/xhtml"> 3 <head> 4 <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> 5 <title>选择符混合使用</title> 6 <style type="text/css"> 7 p.bigFont 8 { 9 font-size:36px;10 font-family:"微软雅黑"；11 }12 p#colorFont13 {14 color:#FF0000;15 } 16 .div1 span, #div1 span, div div p17 {18 color:#FF00FF;19 font-weight:lighter;20 }21 </style>22 </head>23 <body>24 <p>普通文字<div>11</div></p>25 <p class="bigFont">放大文字</p>26 <div class="bigFont">div放大文字</div>27 <p id="colorFont">彩色字体</p>28 <div class="div1">29 <span>div中的span文字</span>30 </div>31 <div><div><p>子DIV中的段落文字</p></div></div>32 </body>33 </html> 输出如下：
==============================================================================================================================================
常见的三种样式表：
一.内嵌样式表：内嵌样式表其实就是把样式放在
,,,,内部。
例子：
1 <!DOCTYPE html> 2 <html xmlns="http://www.w3.org/1999/xhtml"> 3 <head> 4 <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> 5 <title>内嵌样式表</title> 6 <head> 7 <!-- 定义在头部标签里面--> 8 <style type="text/css"> 9 p10 { font-family:"隶书";11 font-size:28px;12 color:#FF0000;13 }14 </style>15 </head>16 <body>17 <h1 id="静夜思">静夜思</h1>18 <h2 id="作者李白">作者李白</h2>19 <p>床前明月光，</p>20 <p>疑是地上霜.</p>21 <p>我是郭德刚，</p>22 <p>低头思故乡.</p>23 </body>24 </html> 输出如下：
==============================================================================================================================================
二.行内样式表：其实就是把样式放在
,,,,,,,,内部。
例子：
1 <!DOCTYPE html > 2 <html xmlns="http://www.w3.org/1999/xhtml"> 3 <head> 4 <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> 5 <title>行内样式表</title> 6 </head> 7 <body> 8 <div style="float:right" > 9 <h1 id="静夜思">静夜思</h1>10 <h2 id="作者李白">作者李白</h2>11 <div style="font-family:'隶书';font-size:28px;color:#FF0000;">12 <p>床前明月光，</p>13 <p>疑是地上霜.</p>14 <p>我是郭德刚，</p>15 <p>低头思故乡.</p>16 </div>17 </div>18 </body>19 </html>
输出如下：
==============================================================================================================================================
三.链接外部样式表：样式放在链接的css/demo.css那个文档里，而链接放在
,,,,,,,,,,,内部。例子：
1 <!DOCTYPE html > 2 <html> 3 <head> 4 <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> 5 <title>链接外部样式表</title> 6 <link href="css/demo.css" type="text/css" rel="stylesheet"/> 7 </head> 8 <body> 9 <h1 id="静夜思">静夜思</h1>10 <h2 id="作者李白">作者李白</h2>11 <p>床前明月光，</p>12 <p>疑是地上霜.</p>13 <p>我是郭德刚，</p>14 <p>低头思故乡.</p>15 </body>16 </html>
输出如下：
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