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第16课 探秘网页与代码

  • 2026-05-12 11:50:51
第16课 探秘网页与代码

——— 七年级  第四单元  校园活动线上展

本课将关注以下问题

    1. 网页与HTML代码有什么关系?

    2. 浏览器是如何显示网页的?

    3. HTML 代码是不是必须保存在网页文件中?

学习目标:

   1. 了解网页与代码之间的对应关系。

   2. 初步认识HTML语言,知道常用标签的作用。

   3. 验证网页内容的保存形式。

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   很多同学对网页为何能够展现图文声像,为何能够实现跳转,如何制作网页等问题心存好奇。本课将带领大家学习网页与网页代码的相关知识。

16.1 网页与HTML代码

    上网浏览时会接触风格各异的网页,里面有文字、图像、音频、视频等多种资源。通过网页中的超链接,可以方便地在网页和资源之间跳转。这一切到底是怎样完成的呢?

  学习活动1

浏览网页,调出浏览器的“开发人员”工具,观察页面代码(图 16.1)。

图16.1  网页与代码

【学习指引】:

    对于学有余力的学生,教师可引导他们通过“猜测验证”环节来进一步了解网页及其对应的HTML代码。例如,先让学生猜测标签的作用,然后修改或删除标签之间的内容,最后通过观察浏览效果验证猜想。

   通过前面的活动不难发现,图文并茂的网页,背后对应着一堆代码。这堆代码对应着描述网页的语言—HTML(hypertext markup language,超文本标记语言)。HTML语言中用于标记内容、格式或超链接的代码符号叫标签。

16.2 显示网页的过程

    浏览器获得网页代码后,就会按照这些代码的要求,显示相应的文字、图像等,进而呈现出完整的网页效果(图16.2)。

图16.2  代码与网页内容对应关系示意图

【学习指引】:

  引导学生形成初步认识:图文声像并茂的网页背后,对应着一串串字符代码,浏览器根据这些代码进行相应的处理,才能呈现出人们看到的网页效果;大部分标签是成对出现的,但也存在不成对的情况。教学时,可以引导学生参照表 16.1 熟悉常用的网页标签。

表 16.1  常用标签

标签
作用
<head></head>
设置文档头部
<title></title>
设置网页标题
<body></body>
设置文档主体
<h1></h1>
设置内容的一级标题
<p></p>
设置新的一行
<img src='***/***'.jpg>
设置图像
<a href='***'></a>
设置超链接

  学习活动2

  1. 用《记事本》软件打开网页文件,尝试通过改代码的方式完成修改网页标题、更换图像、增加图像说明等任务。

  2. 参照以下方法进行操作,在网页中显示一张笑脸图(图16.3)。

   方法一:修改网页,让它显示计算机中的图像文件001.png。浏览网页,观察显示效果。

   方法二:运行《图像编码转换器》软件,选择图像文件001.png后进行编码转换,然后用运行结果替换网页中的标签。确保网页所在文件夹中没有图像文件001.png后,浏览网页,观察显示效果。

图 16.3  笑脸图

   提示:<img src=“data: image/jpeg;base64,iVBORw0KG…… alt=”Image” />

学习指引】:

    1.提示:修改 <title></title> 之间的内容;修改 <img>标签的src属性;在<img>标签后面增加<p>标签。

    2.方法一最常用,指向了一个图像文件。方法二是把图像文件中的数据按 base64 编码方案进行了编码(图16.5)。编码后,二进制的图像数据就可以用字符串的形式表示出来。浏览器可以识别base64编码,并显示图像。此时,图像数据保存在字符串中,因而不再需要图像文件。

图16.5  结果展示

16.3 HTML代码与网页文件

   一般情况下,HTML代码保存在以“.htm”“.html”等为扩展名的网页文件中。但实际浏览过程中,浏览器只要能得到相应的HTML代码就可以了,并不要求这些代码必须以网页文件形式保存。

学习指引】:

    选学内容。网页可以保存在网页文件中,可以保存在数据库中,也可以由软件实时生成。

  学习活动3

  1.  运行《Web服务器》软件(图16.4)。

图16.4  软件窗口

  2. 修改编码、内容等参数。

  3. 根据提示访问这个网站。

  4. 修改内容后再次访问,看看显示的变化。

学习指引】:

   此活动旨在通过实践,了解浏览器需要的是 HTML代码,至于代码是否以网页文件形式保存在服务器中并不重要。

   可以看到,即使没有网页文件,也能完成相应的浏览任务。但考虑到管理、维护、修改等因素,很多网站选择把网页存放在网页文件中。

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拓展与提升

   网页中包含的图像、音频、视频等必须保存在网页所在的那个网站中吗?请验证你的猜想。

【学习指引】:

   验证思路:可设置  标签的 src属性,让它指向外站的一张图像,然后浏览网页时可以看到,外站的图像正常显示在网页中。由此可知,网页中的图像、音频、视频等可以保存在其他网站中。

——— 选自人教版(2026.3)

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  1. CONNECT:[ UseTime:0.000929s ] mysql:host=127.0.0.1;port=3306;dbname=g_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001529s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000790s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000770s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001269s ]
  6. SELECT * FROM `set` [ RunTime:0.000576s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001575s ]
  8. SELECT * FROM `article` WHERE `id` = 458574 LIMIT 1 [ RunTime:0.001124s ]
  9. UPDATE `article` SET `lasttime` = 1778588612 WHERE `id` = 458574 [ RunTime:0.047928s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000664s ]
  11. SELECT * FROM `article` WHERE `id` < 458574 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001149s ]
  12. SELECT * FROM `article` WHERE `id` > 458574 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001114s ]
  13. SELECT * FROM `article` WHERE `id` < 458574 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002751s ]
  14. SELECT * FROM `article` WHERE `id` < 458574 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002379s ]
  15. SELECT * FROM `article` WHERE `id` < 458574 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003041s ]
0.187268s