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`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> </div> <div class="article-other ovf"> <div class="article-more"> <span>展开更多</span> <i></i> </div> </div> <div class="keyword" style="display: flex;font-size: 16px;"> <span style="flex-shrink: 0;">标签：</span> <ul style="display: flex;flex-wrap: wrap;"> </ul> </div> <script>pc2();</script> </div> <div class="bgW mt10 ovf w820 pad20 cnxh cnxh2 ptop10"> <div class="tlt-com tlt-com2"> <h2 class="fl">推荐内容</h2> </div> <div class="list-related"> <ul> <li> <a href="https://www.66378.com/tupm/241947.html" target="_blank" title="美丽厦门智慧健康怎么查询预约是否成功"> <div class="img"> <img src="https://www.66378.com/uploadfile/2026/0520/thumb_100_100_20260520004242904.jpg"> </div> <div class="con"> <p class="title">美丽厦门智慧健康怎么查询预约是否成功</p> <p class="other"></p> </div> </a> </li> <li> <a href="https://www.66378.com/tupm/241937.html" target="_blank" title="专科是什么"> <div class="img"> <img src="https://www.66378.com/uploadfile/2026/0520/thumb_100_100_20260520003641568.jpg"> </div> <div class="con"> <p class="title">专科是什么</p> <p class="other"></p> </div> </a> </li> <li> <a href="https://www.66378.com/tupm/241925.html" target="_blank" title="gta5线上教程怎么才算完成"> <div class="img"> <img src="https://www.66378.com/uploadfile/2026/0520/thumb_100_100_20260520003047368.jpg"> </div> <div class="con"> <p class="title">gta5线上教程怎么才算完成</p> <p class="other"></p> </div> </a> </li> <li> <a href="https://www.66378.com/tupm/241914.html" target="_blank" title="四点水怎么打灬"> <div class="img"> <img src="https://www.66378.com/uploadfile/2026/0520/thumb_100_100_20260520002440109.jpg"> </div> <div class="con"> <p class="title">四点水怎么打灬</p> <p class="other"></p> </div> </a> </li> <li> <a href="https://www.66378.com/tupm/241903.html" target="_blank" title="四点水汉字解释"> <div class="img"> <img src="https://www.66378.com/uploadfile/2026/0520/thumb_100_100_20260520001841272.jpg"> </div> <div class="con"> <p class="title">四点水汉字解释</p> <p class="other"></p> </div> </a> </li> <li> <a href="https://www.66378.com/tupm/241893.html" target="_blank" title="至乐的词语意思是什么"> <div class="img"> <img src="https://www.66378.com/uploadfile/2026/0520/thumb_100_100_20260520001240824.jpg"> </div> <div class="con"> <p class="title">至乐的词语意思是什么</p> <p class="other"></p> </div> </a> </li> <li> <a href="https://www.66378.com/tupm/241881.html" target="_blank" title="cohiba多少钱一支"> <div class="img"> <img src="https://www.66378.com/uploadfile/2026/0520/thumb_100_100_20260520000642673.jpg"> </div> <div class="con"> <p class="title">cohiba多少钱一支</p> <p class="other"></p> </div> </a> </li> <li> <a href="https://www.66378.com/tupm/241869.html" target="_blank" title="至交相关单词"> <div class="img"> <img src="https://www.66378.com/uploadfile/2026/0520/thumb_100_100_20260520000041997.jpg"> </div> <div class="con"> <p class="title">至交相关单词</p> <p class="other"></p> </div> </a> </li> </ul> </div> </div> </div> <div class="right fr"> <div class="bgW pad20 ovf w290 xzph mt10"> <div class="tlt-com"> <h2 class="fl">热门文章</h2> </div> <div class="dl-list ovf"> <ul class="show"> </ul> </div> </div> <div class="rem-box clearfix app-rem pad20 ovf w290 mt10 yxgl" style="z-index: auto; 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