时间：2026-05-20 00:48:40来源：
`placeholder` 属性用于在表单输入框中显示提示信息，帮助用户了解输入内容的格式或要求。它在 HTML 中常用于 `` 和 `` 标签。</p><table><tbody><tr><td> 属性名 </td><td> 说明 </td><td> 示例 </td></tr><tr><td> placeholder</td><td> 输入框为空时显示的提示文本 </td><td> `<input placeholder="请输入">` </td></tr></tbody></table><p>该属性不会影响表单提交，仅在用户未输入内容时显示。支持多种类型，如文本、邮箱、密码等。样式可通过 CSS 自定义，提升用户体验。使用时注意：不要用作替代标签，避免混淆。</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> <script type="text/javascript" charset="utf-8">fun3();fun4();</script> </div> <div class="h20"></div> <div class="title bg"> <div class="flex"> <h3>推荐资讯</h3> </div> </div> <div class="news_list bg"> <ul> <li> <a class="flex" href="https://m.66378.com/tupm/213757.html" title="iphone手机电池低于多少可以免费换新"> <img src="https://www.66378.com/uploadfile/2026/0501/20260501211840527.jpg" alt="iphone手机电池低于多少可以免费换新"> <div class="info flex_grow"> <p>iphone手机电池低于多少可以免费换新</p> <p>2026-05-01</p> </div> </a> </li> <li> <a class="flex" href="https://m.66378.com/tupm/85887.html" title="痈疽疖疔读音 痈疽的同音字"> <img src="https://www.66378.com/uploadfile/2023/1228/20231228010219335.jpg" alt="痈疽疖疔读音 痈疽的同音字"> <div class="info flex_grow"> <p>痈疽疖疔读音 痈疽的同音字</p> <p>2023-12-28</p> </div> </a> </li> <li> <a class="flex" href="https://m.66378.com/tupm/5636.html" title="伊布会说几种语言？（伊布当年为啥离开国米？）"> <img src="https://www.66378.com/uploadfile/2023/0905/20230905025918843.jpg" alt="伊布会说几种语言？（伊布当年为啥离开国米？）"> <div class="info flex_grow"> <p>伊布会说几种语言？（伊布当年为啥离开国米？）</p> <p>2023-06-22</p> </div> </a> </li> <li> <a class="flex" href="https://m.66378.com/tupm/251399.html" title="覃姓的来源"> <img src="https://www.66378.com/uploadfile/2026/0523/20260523145444688.jpg" alt="覃姓的来源"> <div class="info flex_grow"> <p>覃姓的来源</p> <p>2026-05-23</p> </div> </a> </li> <li> <a class="flex" href="https://m.66378.com/tupm/274968.html" title="年收入多少算贫困"> <img src="https://www.66378.com/uploadfile/2026/0601/20260601135451147.jpg" alt="年收入多少算贫困"> <div class="info flex_grow"> <p>年收入多少算贫困</p> <p>2026-06-01</p> </div> </a> </li> </ul> </div> <div class="h20"></div> <script type="text/javascript" charset="utf-8">fun5();</script> <div class="share_wrap_bg hide"></div> <script language="JavaScript" src="https://www.66378.com/api.php?op=count&id=241958&modelid=1"></script> <div class="h20"></div> <footer> <div class="cont"> <p>Copyright © 2023 <a href="https://beian.miit.gov.cn/">苏ICP备2022048461号-3</a></p> <p></p> </div> </footer> <script src="/statics/soft/js/fastclick.min.js" type="text/javascript"></script> <script src="/statics/soft/js/swiper.min.js" type="text/javascript"></script> <script src="/statics/soft/js/index.js" type="text/javascript"></script> <script src="/statics/soft/js/pinchzoom.js" type="text/javascript"></script> <script> $(".mask").click(function(event) { headerNav(); }); </script> </div> </body> </html>