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CSS基礎（一）-添加CSS代碼的三種方式（內聯、內部、外部）、CSS標簽選擇器（標簽、類、id）

時間：2021-07-05 18:24:50 阅读：0 評論：0 收藏：0 [點我收藏+]

標簽：model exp col data number bapi utf-8 uil att

CSS：Cascading Style Sheet的缩写，意思是层叠样式表

作用：美化頁面，可設置頁面上各種元素的樣式，包括顔色、大小、位置等等，使頁面變得更好看。

1.添加CSS代碼的三種方式：內聯、內部、外部

內聯：在標簽的style屬性中添加樣式代碼（使用較少）
- 弊端：不能複用

內部：在head标签里面添加style标签，在标签內部写样式代码（接下來主要以這個進行講解）
- 弊端：只能在當前頁面複用

外部：在單獨的css文件中寫樣式代碼，在html頁面中通過link標簽引入，可以實現多頁面複用（使用最多）

代碼如下：

（1）cssDemo01.html

 <!DOCTYPE html>
 <html>
 <head>
 <meta charset="UTF-8">
 <link rel="添加CSS代码的三种方式：內聯、內部、外部" href="test.css"> 
 <title>cssDemo01</title>
     
 <style type="text/css">
 /* 內部样式表要添加style标签，指定type="text/css"  */
 p{
     font-size: 30px;
     color:orange;
 }
 h3{
     font-size:40px;
     color:green;
 }
 </style>
     
 </head>
 <body>
 <!-- 
     1、內聯样式表：也称内嵌样式表、行内样式表
     在標簽裏直接書寫，標簽中寫style屬性，屬性用""括起來，多個屬性之間用;隔開
     缺点：不能复用，今后使用較少。
     此處以div標簽進行演示：<div>內容</div>
 -->
 <div>內聯样式表效果</div>
 <div style="font-size:20px">內聯样式表效果：添加字体大小</div>
 <div style="color:red">內聯样式表效果：添加字体颜色</div>
 <div style="font-size:30px;color:blue">內聯样式表效果：添加字体大小和颜色</div>
 ?
     
 <!-- 
     2、內部样式表
     在當前html文件中編寫，在head標簽中編寫style標簽 
     注释为：/*  */
     此處以p標簽進行演示：上面p{}設置屬性，下面<p>內容</p>顯示效果
 -->
 <p>內部样式表效果</p>
   
     
 <!-- 
     3、外部樣式表 
     需要在外部創建css文件，將內容寫到該文件中，並在當前文件中引入這個css文件
     此處以span標簽進行演示：<span>內容</span>
     外部css文件爲：test.css
 -->
 <span>外部樣式表效果</span>
 ?
 <!-- 內聯样式表优先级最高，內部样式表与外部样式表采用就近原则 -->
 <h3 style="font-size:20px;color:red">優先級測試</h3>
 ?
 </body>
 </html>

（2）test.css

 @CHARSET "UTF-8";
 span{
     font-size:50px;
     color:yellow;
 }
 h3{
     font-size:60px;
     color:blue;
 }

顯示效果：

技术图片

2.CSS基本選擇器

2.1 标签选择器

格式：標簽名{}
作用：選擇頁面中所有指定名稱的標簽

2.2 类选择器

格式：.class{}，其中class爲類名
作用：選擇頁面中同一類的多個標簽，需要給標簽添加class屬性

2.3 id选择器

格式：#id{}，其中id爲id名
作用：選擇頁面中某一個標簽時使用，需要給標簽添加id屬性，id名不能重複

代碼測試：

 <!DOCTYPE html>
 <html>
 <head>
 <meta charset="UTF-8">
 <title>基本選擇器</title>
 ?
 <style type="text/css">
 /* 內部样式表  */
 /* 1、标签选择器（优先级最低）   */
 li{
     font-size:30px;
     color:blue;
 }
 ?
 /* 2、类选择器（优先级居中）    */
 .bapi{
     color:green;
 }
 ?
 /* 3、id选择器（优先级最高）    */
 #third{
     color:gold;
 }
 ?
 </style>
 ?
 </head>
 <body>
     <ul>
         <li id="first">蘋果</li>
         <li id="second">西瓜</li>
         <li class="bapi">橘子</li>
         <li class="bapi">香蕉</li>
         <li>梨子</li>
         <li class="bapi" id="third">荔枝</li>
     </ul>
 </body>
 </html>

顯示效果：

技术图片

优先级：id选择器 >类选择器 > 标签选择器

CSS基礎（一）-添加CSS代碼的三種方式（內聯、內部、外部）、CSS標簽選擇器（標簽、類、id）

標簽：model exp col data number bapi utf-8 uil att

原文地址：https://www.cnblogs.com/XiaoCui-blog/p/14966596.html

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