第6天:XHTML代码规范_基础教程-css教程-PHP中文网

在开始正式内容制作之前，我们必须先了解一下web标准有关代码的规范。了解这些规范可以帮助你少走弯路,尽快通过代码校验。

1.所有的标记都必须要有一个相应的结束标记

以前在HTML中，你可以打开许多标签，例如

和

而不一定写对应的

和

来关闭它们。但在XHTML中这是不合法的。XHTML要求有严谨的结构，所有标签必须关闭。如果是单独不成对的标签，在标签最后加一个"/"来关闭它。例如:

2.所有标签的元素和属性的名字都必须使用小写

与HTML不一样，XHTML对大小写是敏感的，和<TITLE>是不同的标签。XHTML要求所有的标签和属性的名字都必须使用小写。例如：<BODY>必须写成<body> 。大小写夹杂也是不被认可的，通常dreamweaver自动生成的属性名字"onMouseOver"也必须修改成"onmouseover"。</p> <h3>3.所有的XML标记都必须合理嵌套</h3> <p>同样因为XHTML要求有严谨的结构，因此所有的嵌套都必须按顺序，以前我们这样写的代码：</p> <span class="code"><p><b></p>/b></span> <p>必须修改为：</p> <span class="code"><p><b></b>/p></span> <p>就是说，一层一层的嵌套必须是严格对称。</p> <h3>4.所有的属性必须用引号""括起来</h3> <p>在HTML中，你可以不需要给属性值加引号，但是在XHTML中，它们必须被加引号。例如:</p> <span class="code"><height=80></span> <p>必须修改为：</p> <span class="code"><height="80"></span> <p>特殊情况，你需要在属性值里使用双引号，你可以用"，单引号可以使用'，例如：</p> <span class="code"><alt="say'hello'"></span> <h3>5.把所有<和&特殊符号用编码表示</H3> <UL> <LI>任何小于号（<），不是标签的一部分，都必须被编码为<SPAN class=code>& l t ;</SPAN> <LI>任何大于号（>），不是标签的一部分，都必须被编码为<span class="code">& g t ;</span> </h3> <li>任何与号（&），不是实体的一部分的，都必须被编码为<span class="code">& a m p;</span> </li> <p>注：以上字符之间无空格。</p> <h3>6.给所有属性赋一个值</h3> <p>XHTML规定所有属性都必须有一个值，没有值的就重复本身。例如：</p> <span class="code"><td nowrap></span> <span class="code"><input type="checkbox" name="shirt" value="medium" checked></span> <p>必须修改为：</p> <span class="code"><td nowrap="nowrap"></span> <span class="code"><input type="checkbox" name="shirt" value="medium" checked="checked"></span> <h3>7.不要在注释内容中使“--”</h3> <p>“--”只能发生在XHTML注释的开头和结束，也就是说，在内容中它们不再有效。例如下面的代码是无效的:</p> <span class="code"></span> <p>用等号或者空格替换内部的虚线。</p> <span class="code"></span> <p>以上这些规范有的看上去比较奇怪，但这一切都是为了使我们的代码有一个统一、唯一的标准，便于以后的数据再利用。</p> </div> </div> <div style="height: 25px;"> <div class="wzconBq" style="display: inline-flex;"> <span>相关标签：</span> <div class="wzcbqd"> <a onclick="hits_log(2,'www',this);" href-data="https://www.php.cn/zh/search?word=第6天:xhtml代码规范" target="_blank">第6天:XHTML代码规范</a> </div> </div> <div style="display: inline-flex;float: right; color:#333333;">来源：php.cn</div> </div> <div class="wzconOtherwz"> <a href="https://www.php.cn/zh/faq/1162.html" title="韩国商业网站设计分析"> <span>上一篇：韩国商业网站设计分析</span> </a> <a href="https://www.php.cn/zh/faq/1164.html" title="详细解读Silverlight 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