在HTML中，设置默认字段通常涉及到表单元素的默认值，这可以通过在、</code>或<code><select></code>元素中使用<code>value</code>属性来实现。</p><p><img src="/upload/ad_content/xuanchuantu-29.jpg"></p><p>以下是一个简单的例子：</p><pre class="brush:html;toolbar:false"> <!DOCTYPE html> <html> <body> <h2>HTML Forms</h2> <form action="/submit_form"> <label for="fname">First name:</label><br> <input type="text" id="fname" name="fname" value="John"><br> <label for="lname">Last name:</label><br> <input type="text" id="lname" name="lname" value="Doe"><br><br> <input type="submit" value="Submit"> </form> </body> </html> </pre><p>在这个例子中，我们设置了两个文本输入字段的默认值为"John"和"Doe"，当用户打开这个页面时，这两个字段已经被填充了默认值。</p><p>如果你想要设置一个下拉列表的默认选项，你可以使用<code><option></code>标签，并使用<code>selected</code>属性来标记它。</p><pre class="brush:html;toolbar:false"> <!DOCTYPE html> <html> <body> <h2>HTML Forms</h2> <form action="/submit_form"> <label for="cars">Choose a car:</label> <select id="cars" name="cars"> <option value="volvo">Volvo</option> <option value="saab">Saab</option> <option value="mercedes" selected>Mercedes</option> <option value="audi">Audi</option> </select> <br><br> <input type="submit" value="Submit"> </form> </body> </html> </pre><p>在这个例子中，"Mercedes"是默认选项，因为它有<code>selected</code>属性，当用户打开这个页面时，他们可以直接看到"Mercedes"被选中。</p> <br> 网页标题：html如何设置默认字段 <br> 分享链接：<a href="http://www.cxhlcq.com/article/cddcchp.html">http://www.cxhlcq.com/article/cddcchp.html</a> </div> </div> </div> <div class="other container"> <h3>其他资讯</h3> <ul> <li> <a href="/article/dpgeocd.html">如何在Linux系统下给U盘进行分区？（linux给u盘分区）</a> </li><li> <a href="/article/dpgeogd.html">FlinkCDC里这个问题怎么解决？</a> </li><li> <a href="/article/dpgeoih.html">vps账号密码怎么修改？(vps如何修改密码)</a> </li><li> <a href="/article/dpgeosh.html">VMware12中识别和配置CentOS7.2新添加网卡</a> </li><li> <a href="/article/dpgeogp.html">12款开发者应该了解的Eclipse插件</a> </li> </ul> </div> <div class="footer"> <div class="foota container"> <div class="foot_nav fl col-lg-8 col-md-8 col-sm-12 col-xs-12"> <ul> <li class="col-lg-3 col-md-3 col-sm-3 col-xs-6"> 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</code>或<code><select></code>元素中使用<code>value</code>属性来实现。</p><p><img src="/upload/ad_content/xuanchuantu-29.jpg"></p><p>以下是一个简单的例子：</p><pre class="brush:html;toolbar:false"> <!DOCTYPE html> <html> <body> <h2>HTML Forms</h2> <form action="/submit_form"> <label for="fname">First name:</label><br> <input type="text" id="fname" name="fname" value="John"><br> <label for="lname">Last name:</label><br> <input type="text" id="lname" name="lname" value="Doe"><br><br> <input type="submit" value="Submit"> </form> </body> </html> </pre><p>在这个例子中，我们设置了两个文本输入字段的默认值为"John"和"Doe"，当用户打开这个页面时，这两个字段已经被填充了默认值。</p><p>如果你想要设置一个下拉列表的默认选项，你可以使用<code><option></code>标签，并使用<code>selected</code>属性来标记它。</p><pre class="brush:html;toolbar:false"> <!DOCTYPE html> <html> <body> <h2>HTML Forms</h2> <form action="/submit_form"> <label for="cars">Choose a car:</label> <select id="cars" name="cars"> <option value="volvo">Volvo</option> <option value="saab">Saab</option> <option value="mercedes" selected>Mercedes</option> <option value="audi">Audi</option> </select> <br><br> <input type="submit" value="Submit"> </form> </body> </html> </pre><p>在这个例子中，"Mercedes"是默认选项，因为它有<code>selected</code>属性，当用户打开这个页面时，他们可以直接看到"Mercedes"被选中。</p> <br> 网页标题：html如何设置默认字段 <br> 分享链接：<a href="http://www.cxhlcq.com/article/cddcchp.html">http://www.cxhlcq.com/article/cddcchp.html</a> </div> </div> </div> <div class="other container"> <h3>其他资讯</h3> <ul> <li> <a href="/article/dpgeocd.html">如何在Linux系统下给U盘进行分区？（linux给u盘分区）</a> </li><li> <a href="/article/dpgeogd.html">FlinkCDC里这个问题怎么解决？</a> </li><li> <a href="/article/dpgeoih.html">vps账号密码怎么修改？(vps如何修改密码)</a> </li><li> <a href="/article/dpgeosh.html">VMware12中识别和配置CentOS7.2新添加网卡</a> </li><li> <a href="/article/dpgeogp.html">12款开发者应该了解的Eclipse插件</a> </li> </ul> </div> <div class="footer"> <div class="foota container"> <div class="foot_nav fl col-lg-8 col-md-8 col-sm-12 col-xs-12"> <ul> <li class="col-lg-3 col-md-3 col-sm-3 col-xs-6"> <h3>网站制作</h3> <a href="http://www.cdxtjz.com/" 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