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如何读懂html源代码

HTML（HyperText Markup Language）是一种用于创建网页的标记语言，它使用一系列标签来描述网页的内容和结构，要读懂HTML源代码，你需要了解一些基本的HTML标签和属性，以下是一些关于如何读懂HTML源代码的详细技术教学。

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1、学习基本的HTML标签

HTML文档由一系列的标签组成，这些标签描述了网页的结构，最基本的HTML标签包括：

：定义文档类型和版本

：包含整个HTML文档

：包含文档的元数据，如标题、字符集等

</code>：定义文档的标题，显示在浏览器的标题栏或标签页上</p><p><code><body></code>：包含文档的主体内容，如文本、图片、链接等</p><p>2、学习常用的HTML标签</p><p>除了基本标签外，还有许多常用的HTML标签，如：</p><p><code><h1></code>到<code><h6></code>：定义不同级别的标题</p><p><code><p></code>：定义段落</p><p><code><a></code>：定义超链接</p><p><code><img></code>：插入图片</p><p><code><ul></code>、<code><ol></code>、<code><li></code>：定义无序列表和有序列表</p><p><code><table></code>、<code><tr></code>、<code><td></code>：定义表格</p><p><code><form></code>：定义表单</p><p><code><input></code>、<code><textarea></code>、<code><button></code>：定义输入框、文本区域和按钮</p><p>3、学习HTML属性</p><p>HTML标签还可以包含属性，这些属性为标签提供额外的信息。<code><a></code>标签有一个<code>href</code>属性，用于指定链接的目标URL，其他常见的HTML属性包括：</p><p><code>class</code>：为元素分配一个或多个类名，以便通过CSS进行样式设置</p><p><code>id</code>：为元素分配一个唯一的ID，以便通过JavaScript和CSS进行引用和样式设置</p><p><code>style</code>：为元素内联样式设置</p><p><code>src</code>、<code>href</code>、<code>action</code>等：为元素指定资源文件的URL或其他相关信息</p><p>4、学习HTML实体</p><p>HTML中有一些特殊的字符，如小于号（<code><</code>）、大于号（<code>></code>）、和号（&）等，它们具有特殊的含义，为了在HTML文档中正确地显示这些字符，我们需要使用实体字符，小于号用<code><</code>表示，大于号用<code>></code>表示，和号用<code>&</code>表示，还有一些其他的实体字符，如版权符号（©）用<code>©</code>表示，注册商标符号（™）用<code>™</code>表示等。</p><p>5、使用工具查看HTML源代码</p><p>有许多在线工具可以帮助你查看和编辑HTML源代码，如W3Schools的在线编辑器、MDN的HTML编辑器等，你可以使用这些工具打开一个HTML文件，查看其源代码，并进行编辑，浏览器的开发者工具也可以用来查看和编辑HTML源代码，在Chrome浏览器中，按F12键打开开发者工具，然后切换到“Elements”选项卡，就可以看到当前页面的HTML结构。</p><p>6、学习调试HTML代码</p><p>当你遇到HTML代码的问题时，可能需要进行调试，以下是一些调试HTML代码的方法：</p><p>使用浏览器的开发者工具检查错误，开发者工具通常会显示红色或黄色的错误提示，指出代码中的问题所在，点击错误提示旁边的行号，可以直接跳转到有问题的代码行。</p><p>使用W3C的验证服务检查代码的正确性，访问https://validator.w3.org/，将你的HTML代码粘贴到“Validate by Direct Input”框中，然后点击“Check”按钮，验证服务会返回一个报告，指出代码中的错误和警告，根据报告修改代码，直到没有错误和警告为止。</p><p>请教其他人或查阅文档，如果你无法解决代码问题，可以尝试向同事、朋友或在线社区请教，查阅HTML相关文档和教程也是一个好方法。</p><p>要读懂HTML源代码，你需要学习基本的HTML标签、常用标签、属性和实体字符，以及如何使用工具查看和调试代码，通过不断地学习和实践，你会逐渐掌握HTML编程的技巧。</p> <br> 新闻名称：如何读懂html源代码 <br> 当前地址：<a href="http://jxjierui.cn/article/cdjdcdc.html">http://jxjierui.cn/article/cdjdcdc.html</a> </div> <div class="hot_new"> <div class="page_title clearfix"> <h3>其他资讯</h3> </div> <div class="news_list clearfix"> <ul> <li> <a href="/article/cogjdie.html">准备准备Oracle下载你需要了解什么</a> </li><li> <a href="/article/cogjojj.html">云服务器操作系统用哪个好（云服务器操作系统用哪个好用）</a> </li><li> <a href="/article/cogjdsh.html">创新互联Python教程：Linux端文件清理的Python脚本实现</a> </li><li> <a href="/article/cogjdeh.html">没有u盘怎么重装系统</a> </li><li> <a href="/article/cogjdch.html">Linux正则表达式分组：轻松管理数据匹配（linux正则分组）</a> </li> </ul> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> <!-- 底部信息 --> <div class="footer wow fadeInUp"> <div 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12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Hook.class.php ( 4.01 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/App.class.php ( 13.49 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Dispatcher.class.php ( 14.79 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Route.class.php ( 13.36 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Controller.class.php ( 11.23 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/View.class.php ( 7.59 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 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12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Template/TagLib.class.php ( 9.16 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/App/Runtime/Cache/Home/7540f392f42b28b481b30614275e4e55.php ( 13.96 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Behavior/WriteHtmlCacheBehavior.class.php ( 0.97 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Behavior/ShowPageTraceBehavior.class.php ( 5.24 KB )</li> </ol> </div> <div style="display:none;"> <ol style="padding: 0; margin:0"> <li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_init ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\BuildLiteBehavior [ RunTime:0.000004s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_init ] --END-- [ RunTime:0.000024s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_begin ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\ReadHtmlCacheBehavior [ RunTime:0.000134s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_begin ] --END-- [ RunTime:0.000146s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ view_parse ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ template_filter ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\ContentReplaceBehavior [ RunTime:0.000048s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ template_filter ] --END-- [ RunTime:0.000064s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\ParseTemplateBehavior [ RunTime:0.003351s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ view_parse ] --END-- [ RunTime:0.003365s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ view_filter ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\WriteHtmlCacheBehavior [ RunTime:0.000062s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ view_filter ] --END-- [ RunTime:0.000071s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_end ] --START--</li> </ol> </div> <div style="display:none;"> <ol style="padding: 0; margin:0"> <li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1 [ SQL语句 ] : SELECT `id`,`pid`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1 </li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1 [ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1 </li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 1 [ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( pid= ) </li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[8] Undefined index: pid /home/wwwroot/jxjierui.cn/App/Home/Controller/ArticleController.class.php 第 47 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[2] file_put_contents(./App/Runtime/Temp/fdaa88d0e3706994dd0ddf92aa2b4bc8.php): failed to open stream: Permission denied /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Cache/Driver/File.class.php 第 132 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[8] Undefined index: db_host /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db.class.php 第 120 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[8] Undefined index: db_port /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db.class.php 第 121 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[8] Undefined index: db_name /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db.class.php 第 122 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[2] file_put_contents(./App/Runtime/Temp/cbe16daf17e186a23aff6eb936db8c9b.php): failed to open stream: Permission denied /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Cache/Driver/File.class.php 第 132 行.</li> </ol> </div> <div style="display:none;"> <ol style="padding: 0; margin:0"> </ol> </div> <div style="display:none;"> <ol style="padding: 0; margin:0"> </ol> </div> </div> </div> <div id="think_page_trace_close" style="display:none;text-align:right;height:15px;position:absolute;top:10px;right:12px;cursor: pointer;"><img style="vertical-align:top;" 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3ukcXd5s7LvLD3me61WkuTCpJzYAyRurMB44EdEJzTfU271lUJC03YjXJXzYOGZwN4D8eB5jlfLrdWfzGRW7icMPfiSO6Oe7s20bmhdgLX4Z23B+s3JgQESzUDiMboSzDMHFpNMwccGePauhfwjzwnI2wu9zKGgEFg80jcZ7MHllk07s1H+5yojtUQTlH4nFdLKTGwDmPbIklOb1L1zO4T6N8NCuDLFLS/C63c0eNRimZ++s5BMBHxU11jHchI9oFVUxRh/eMDzHEzGYu0Lg8gJ7oS/tFCwoic44fyUtix0n/46vP4bf+//BRgAYwDDar4ncHIAAAAASUVORK5CYII="></div> 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