html 怎么设置默认值-前端问答-PHP中文网

HTML是超文本标记语言，它是用来制作网页的基础语言。一个网页通常包括HTML、CSS和JavaScript三种语言。其中，HTML是最基础的语言，它用来描述网页的文本内容、结构和布局。

当我们在设计网页的时候，有时会需要设置一些控件的默认值，例如输入框、下拉框、单选框、复选框等等。这些控件的默认值是指当用户访问网页时，这些控件显示的值。如果没有设置默认值，那么这些控件通常是空白的。

那么，如何在HTML中设置控件的默认值呢？接下来，就让我们一起来了解一下。

一、HTML中设置输入框的默认值

在HTML中，可以通过在标签中设置value属性来设置输入框的默认值。例如：

<input type="text" name="username" value="admin">

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上面代码中，name属性表示该输入框的名称是"username"，value属性表示该输入框的默认值是"admin"。

二、HTML中设置下拉框的默认值

在HTML中，可以通过在标签中设置checked属性来实现。例如：

<input type="radio" name="gender" value="male" checked> Male
<input type="radio" name="gender" value="female"> Female

<input type="checkbox" name="hobby" value="reading" checked> Reading
<input type="checkbox" name="hobby" value="traveling" checked> Traveling
<input type="checkbox" name="hobby" value="sports"> Sports

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在上面的代码中，第一个单选框和前两个复选框设置了checked属性，表示它们是默认选中的。注意，单选框和复选框的name属性必须相同，否则它们就不会在同一个选项组内。

四、HTML中设置文本域的默认值

文本域是一个多行的输入框，它的默认值可以通过在标签中设置文本内容来实现。例如：</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><textarea name="description">This is a description.</textarea></pre><div class="contentsignin">登录后复制</div></div> <p>在上面的代码中，该文本域的默认值是"This is a description."。</p> <p>总结</p> <p>通过上述方法，我们可以在HTML中设置控件的默认值，使得用户在访问网页时，这些控件默认显示我们设置的值。这样就可以方便用户，提高用户体验。</p> <p>需要注意的是，设置默认值不代表用户必须输入这些值，用户还是可以任意修改这些控件的值。</p><p>以上是html 怎么设置默认值的详细内容。更多信息请关注PHP中文网其他相关文章！</p> </div> </div> <div style="height: 25px;"> <div style="display: inline-flex;float: right; color:#333333;">来源：php.cn</div> </div> <div class="wzconOtherwz"> <a href="http://www.php.cn/zh/faq/523890.html" title="探讨如何将 DOCX 文件转换为 HTML"> <span>上一篇：探讨如何将 DOCX 文件转换为 HTML</span> </a> <a href="http://www.php.cn/zh/faq/523894.html" title="聊聊HTML转PDF的方法"> <span>下一篇：聊聊HTML转PDF的方法</span> </a> </div> <div class="wzconShengming"> <div class="bzsmdiv">本站声明</div> 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