【html5里的required是啥意思】在HTML5中，`required` 是一个非常常见的属性，主要用于表单验证。它的作用是确保用户在提交表单之前必须填写某个字段，否则无法提交表单。这个属性可以应用在 ``、``、`<select>` 等表单元素上。</p><p>通过使用 `required` 属性，开发者可以在不编写额外 JavaScript 代码的情况下，实现基本的表单验证功能，提升用户体验和数据完整性。</p><p>`required` 是 HTML5 中用于表单验证的一个属性，它标记某个表单字段为必填项。如果用户未填写该字段就尝试提交表单，浏览器会自动提示用户进行填写。此属性简化了表单验证流程，提高了开发效率，并增强了表单数据的准确性。</p><p>表格说明：</p><table><tbody><tr><td> 属性名称 </td><td> 用途 </td><td> 使用方式 </td><td> 是否需要 JS 支持 </td><td> 是否影响表单提交 </td><td> 适用元素 </td></tr><tr><td> required </td><td> 标记必填字段，防止空值提交 </td><td> `<input type="text" required>` </td><td> 否 </td><td> 是 </td><td> input, textarea, select, etc. </td></tr></tbody></table><p>示例代码：</p><p>```html</p><p><form></p><p><label>姓名：</label></p><p><input type="text" name="name" required></p><p><label>邮箱：</label></p><p><input type="email" name="email" required></p><p><button type="submit">提交</button></p><p></form></p><p>```</p><p>在这个例子中，如果用户没有填写“姓名”或“邮箱”，点击“提交”按钮时，浏览器会自动弹出提示，要求用户填写相应内容。</p><p>小结：</p><p>`required` 是 HTML5 提供的一个简单但强大的表单验证工具，适用于大多数常见的表单场景。它不仅减少了对 JavaScript 的依赖，也提升了用户的交互体验。对于初学者和经验丰富的开发者来说，都是值得掌握的实用属性。</p><style>table,tr{width: 100%;text-align: center;color: #333;font-size: 16px;line-height: 1.8em;margin-bottom: 32px;border: 1px solid #333;empty-cells:show;}table tr th {border: 1px solid #333;text-align: center;font-weight: 600;background: #eee;}table tr td {border: 1px solid #333;text-align: center}</style> </div> </div> </div> <!--内容关联投票--> <div class="clear"></div> <div id="SGOContentPage" class="SiteGeneralContentPage" style="margin-top:15px;"></div> <div class="article_footer clearfix"> <div class="fr tag"> 标签： <a href="https://www.mjgov.cn/tag/html5liderequiredshishayisi/" target="_blank">html5里的required是啥意思</a> </div> </div> <div class="content_banquan"> <p><span class="strong">免责声明：本答案或内容为用户上传，不代表本网观点。其原创性以及文中陈述文字和内容未经本站证实，对本文以及其中全部或者部分内容、文字的真实性、完整性、及时性本站不作任何保证或承诺，请读者仅作参考，并请自行核实相关内容。 如遇侵权请及时联系本站删除。</span></p> </div> <script> if (isMobile()){ document.write('<div style="text-align:center;margin-top:10px;margin-left:-15px;"><script>wap_show_tag_under9();<\/script><\/div>'); 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