4K+ 次浏览
本文将教你如何在 HTML 中设置文本区域中可见的行数。HTML `` 元素对于多行编辑控件非常有用，允许用户输入大量自由格式文本。语法以下是设置文本区域中可见行数的语法：要显示控件的行数或可见文本行数，可以使用 HTML `<textarea>` 的 `rows` 属性指定。此外，它还指定文本区域的可见高度。以下是一些设置可见行数的示例…… <a href="https://tutorialspoint.com/How-do-we-set-the-visible-number-of-lines-in-a-text-area-in-HTML"><span class="read_more">阅读更多 <i class="fal fa-long-arrow-right"></i></span></a></p> </div> </div> </div> <div class="clear"></div> <div class="question_section"> <div class="google_content_ads"> <div style="text-align: center;"> <div id="ezoic-pub-ad-placeholder-133"></div> <script> ezstandalone.cmd.push(function() { ezstandalone.showAds(133); }); </script> </div> </div> </div> <div class="question_section"> <div class="qa_widget"> <div class="qa_post qa_list"> <h3> <a href="https://tutorialspoint.com/Execute-a-script-when-the-element-is-invalid-in-HTML" target="_blank">在 HTML 中，元素无效时如何执行脚本？</a> </h3> <div class="qa_category" id="tags_6983"> <a href="https://tutorialspoint.com/articles/category/HTML" target="_blank"><span>HTML</span></a><a href="https://tutorialspoint.com/articles/category/Web-Development" target="_blank"><span>网页开发</span></a><a href="https://tutorialspoint.com/articles/category/Front-End-Technology" target="_blank"><span>前端技术</span></a></div> </div> <div class="qa_answer_widget"> <a href="https://tutorialspoint.com/authors/yaswanth-verma" title="Yaswanth Varma"><img src="https://tutorialspoint.com/assets/profiles/511236/profile/60_1602256-1662106429.jpg" alt="Yaswanth Varma"></a> <div class="qa_answer_detail"> <a href="https://tutorialspoint.com/authors/yaswanth-verma" title="Yaswanth Varma">Yaswanth Varma</a> </div> <div class="flex-group"> <div class="qa_answer_dtm">更新于 2022年12月15日 12:39:56</div> <p class="views-count" title="Article Views"><svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 576 512"><path d="M117.2 136C160.3 96 217.6 64 288 64s127.7 32 170.8 72c43.1 40 71.9 88 85.2 120c-13.3 32-42.1 80-85.2 120c-43.1 40-100.4 72-170.8 72s-127.7-32-170.8-72C74.1 336 45.3 288 32 256c13.3-32 42.1-80 85.2-120zM288 32c-80.8 0-145.5 36.8-192.6 80.6C48.6 156 17.3 208 2.5 243.7c-3.3 7.9-3.3 16.7 0 24.6C17.3 304 48.6 356 95.4 399.4C142.5 443.2 207.2 480 288 480s145.5-36.8 192.6-80.6c46.8-43.5 78.1-95.4 93-131.1c3.3-7.9 3.3-16.7 0-24.6c-14.9-35.7-46.2-87.7-93-131.1C433.5 68.8 368.8 32 288 32zM192 256a96 96 0 1 1 192 0 96 96 0 1 1 -192 0zm224 0a128 128 0 1 0 -256 0 128 128 0 1 0 256 0z"></path></svg>242 次浏览</p> </div> <div class="clear"></div> <p>在这篇文章中，我们将学习在 HTML 中元素无效时如何运行脚本。我们熟悉 `<input>` 标签和元素。HTML 元素 HTML 表单用于收集用户输入。用户输入最常由服务器处理。……HTML 标签 `<input>` 标签指定一个用户可输入数据的字段。`<input>` 元素是最重要的表单元素。根据 `type` 属性，`<input>` 元素可以以多种方式呈现。当可提交元素…… <a href="https://tutorialspoint.com/Execute-a-script-when-the-element-is-invalid-in-HTML"><span class="read_more">阅读更多 <i class="fal fa-long-arrow-right"></i></span></a></p> </div> </div> </div> <div class="clear"></div> <div class="question_section"> <div class="qa_widget"> <div class="qa_post qa_list"> <h3> <a href="https://tutorialspoint.com/How-to-specify-that-the-element-must-be-filled-out-before-submitting-the-form-in-HTML" target="_blank">如何在 HTML 中指定在提交表单之前必须填写该元素？</a> </h3> <div class="qa_category" id="tags_6981"> <a href="https://tutorialspoint.com/articles/category/HTML" target="_blank"><span>HTML</span></a><a href="https://tutorialspoint.com/articles/category/Web-Development" target="_blank"><span>网页开发</span></a><a href="https://tutorialspoint.com/articles/category/Front-End-Technology" target="_blank"><span>前端技术</span></a></div> </div> <div class="qa_answer_widget"> <a href="https://tutorialspoint.com/authors/Vanithasree" title="vanithasree"><img src="https://tutorialspoint.com/assets/profiles/13547/profile/60_85216-1512542720.jpg" alt="vanithasree"></a> <div class="qa_answer_detail"> <a href="https://tutorialspoint.com/authors/Vanithasree" title="vanithasree">vanithasree</a> </div> <div class="flex-group"> <div class="qa_answer_dtm">更新于 2020年3月3日 11:05:03</div> <p class="views-count" title="Article Views"><svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 576 512"><path d="M117.2 136C160.3 96 217.6 64 288 64s127.7 32 170.8 72c43.1 40 71.9 88 85.2 120c-13.3 32-42.1 80-85.2 120c-43.1 40-100.4 72-170.8 72s-127.7-32-170.8-72C74.1 336 45.3 288 32 256c13.3-32 42.1-80 85.2-120zM288 32c-80.8 0-145.5 36.8-192.6 80.6C48.6 156 17.3 208 2.5 243.7c-3.3 7.9-3.3 16.7 0 24.6C17.3 304 48.6 356 95.4 399.4C142.5 443.2 207.2 480 288 480s145.5-36.8 192.6-80.6c46.8-43.5 78.1-95.4 93-131.1c3.3-7.9 3.3-16.7 0-24.6c-14.9-35.7-46.2-87.7-93-131.1C433.5 68.8 368.8 32 288 32zM192 256a96 96 0 1 1 192 0 96 96 0 1 1 -192 0zm224 0a128 128 0 1 0 -256 0 128 128 0 1 0 256 0z"></path></svg>680 次浏览</p> </div> <div class="clear"></div> <p>HTML 中的 `required` 属性用于指定在提交表单之前必须填写该元素。如果未填写该字段并单击提交按钮，则会生成错误，导致表单提交失败。错误将显示为“请填写此字段”。`required` 属性可用于 `<input>`、`<select>` 和 `<textarea>` 元素。示例您可以尝试运行以下代码来实现 `readonly` 属性： HTML `placeholder` 属性 注册</p> </div> </div> </div> <div class="clear"></div> <div class="question_section"> <div class="qa_widget"> <div class="qa_post qa_list"> <h3> <a href="https://tutorialspoint.com/Set-the-relationship-between-the-current-document-and-the-linked-document-in-HTML" target="_blank">如何在 HTML 中设置当前文档和链接文档之间的关系？</a> </h3> <div class="qa_category" id="tags_6980"> <a href="https://tutorialspoint.com/articles/category/HTML" target="_blank"><span>HTML</span></a><a href="https://tutorialspoint.com/articles/category/Web-Development" target="_blank"><span>网页开发</span></a><a href="https://tutorialspoint.com/articles/category/Front-End-Technology" target="_blank"><span>前端技术</span></a></div> </div> <div class="qa_answer_widget"> <a href="https://tutorialspoint.com/authors/Govinda-Sai" title="Govinda Sai"><img src="https://tutorialspoint.com/assets/profiles/13542/profile/60_86497-1512650655.jpg" alt="Govinda Sai"></a> <div class="qa_answer_detail"> <a href="https://tutorialspoint.com/authors/Govinda-Sai" title="Govinda Sai">Govinda Sai</a> </div> <div class="flex-group"> <div class="qa_answer_dtm">更新于 2020年3月3日 11:04:19</div> <p class="views-count" title="Article Views"><svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 576 512"><path d="M117.2 136C160.3 96 217.6 64 288 64s127.7 32 170.8 72c43.1 40 71.9 88 85.2 120c-13.3 32-42.1 80-85.2 120c-43.1 40-100.4 72-170.8 72s-127.7-32-170.8-72C74.1 336 45.3 288 32 256c13.3-32 42.1-80 85.2-120zM288 32c-80.8 0-145.5 36.8-192.6 80.6C48.6 156 17.3 208 2.5 243.7c-3.3 7.9-3.3 16.7 0 24.6C17.3 304 48.6 356 95.4 399.4C142.5 443.2 207.2 480 288 480s145.5-36.8 192.6-80.6c46.8-43.5 78.1-95.4 93-131.1c3.3-7.9 3.3-16.7 0-24.6c-14.9-35.7-46.2-87.7-93-131.1C433.5 68.8 368.8 32 288 32zM192 256a96 96 0 1 1 192 0 96 96 0 1 1 -192 0zm224 0a128 128 0 1 0 -256 0 128 128 0 1 0 256 0z"></path></svg>183 次浏览</p> </div> <div class="clear"></div> <p>使用 `rel` 属性查看当前文档和链接文档之间的关系。它适用于 `<link>`、`<a>`、`<area>` HTML 元素。示例您可以尝试运行以下代码来实现 `rel` 属性。此示例设置 CSS 文件： 标题 这是一个演示内容。</p> </div> </div> </div> <div class="clear"></div> <div class="question_section"> <div class="qa_widget"> <div class="qa_post qa_list"> <h3> <a href="https://tutorialspoint.com/How-to-specify-that-the-element-is-read-only-in-HTML" target="_blank">如何在 HTML 中指定元素为只读？</a> </h3> <div class="qa_category" id="tags_6979"> <a href="https://tutorialspoint.com/articles/category/HTML" target="_blank"><span>HTML</span></a><a href="https://tutorialspoint.com/articles/category/Web-Development" target="_blank"><span>网页开发</span></a><a href="https://tutorialspoint.com/articles/category/Front-End-Technology" target="_blank"><span>前端技术</span></a></div> </div> <div class="qa_answer_widget"> <a href="https://tutorialspoint.com/authors/yaswanth-verma" title="Yaswanth Varma"><img src="https://tutorialspoint.com/assets/profiles/511236/profile/60_1602256-1662106429.jpg" alt="Yaswanth Varma"></a> <div class="qa_answer_detail"> <a href="https://tutorialspoint.com/authors/yaswanth-verma" title="Yaswanth Varma">Yaswanth Varma</a> </div> <div class="flex-group"> <div class="qa_answer_dtm">更新于 2022年12月15日 15:57:16</div> <p class="views-count" title="Article Views"><svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 576 512"><path d="M117.2 136C160.3 96 217.6 64 288 64s127.7 32 170.8 72c43.1 40 71.9 88 85.2 120c-13.3 32-42.1 80-85.2 120c-43.1 40-100.4 72-170.8 72s-127.7-32-170.8-72C74.1 336 45.3 288 32 256c13.3-32 42.1-80 85.2-120zM288 32c-80.8 0-145.5 36.8-192.6 80.6C48.6 156 17.3 208 2.5 243.7c-3.3 7.9-3.3 16.7 0 24.6C17.3 304 48.6 356 95.4 399.4C142.5 443.2 207.2 480 288 480s145.5-36.8 192.6-80.6c46.8-43.5 78.1-95.4 93-131.1c3.3-7.9 3.3-16.7 0-24.6c-14.9-35.7-46.2-87.7-93-131.1C433.5 68.8 368.8 32 288 32zM192 256a96 96 0 1 1 192 0 96 96 0 1 1 -192 0zm224 0a128 128 0 1 0 -256 0 128 128 0 1 0 256 0z"></path></svg>129 次浏览</p> </div> <div class="clear"></div> <p>在本文中，我们将学习如何在 HTML 中指定作者认为音频/视频在页面加载时应如何加载。通过使用 HTML 音频预加载属性，作者可以描述他们希望音频在页面加载时的加载方式。此功能允许作者告诉浏览器如何实现网站的用户体验。注意 - 当存在 `autoplay` 时，`preload` 将被忽略。语法以下是 HTML `preload` 属性的语法。为了更好地理解如何在 HTML 中指定作者认为音频/视频…… <a href="https://tutorialspoint.com/How-to-specify-that-the-element-is-read-only-in-HTML"><span class="read_more">阅读更多 <i class="fal fa-long-arrow-right"></i></span></a></p> </div> </div> </div> <div class="clear"></div> <div class="question_section"> <div class="qa_widget"> <div class="qa_post qa_list"> <h3> <a href="https://tutorialspoint.com/How-to-specify-if-and-how-the-author-thinks-the-audio-video-should-be-loaded-when-the-page-loads-in-HTML" target="_blank">如何在 HTML 中指定作者认为音频/视频在页面加载时应如何加载？</a> </h3> <div class="qa_category" id="tags_6978"> <a href="https://tutorialspoint.com/articles/category/HTML" target="_blank"><span>HTML</span></a><a href="https://tutorialspoint.com/articles/category/Web-Development" target="_blank"><span>网页开发</span></a><a href="https://tutorialspoint.com/articles/category/Front-End-Technology" target="_blank"><span>前端技术</span></a></div> </div> <div class="qa_answer_widget"> <a href="https://tutorialspoint.com/authors/Prabhas" title="Prabhas"><img src="https://tutorialspoint.com/assets/profiles/13554/profile/60_90506-1512543588.jpg" alt="Prabhas"></a> <div class="qa_answer_detail"> <a href="https://tutorialspoint.com/authors/Prabhas" title="Prabhas">Prabhas</a> </div> <div class="flex-group"> <div class="qa_answer_dtm">更新于 2020年6月24日 11:48:24</div> <p class="views-count" title="Article Views"><svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 576 512"><path d="M117.2 136C160.3 96 217.6 64 288 64s127.7 32 170.8 72c43.1 40 71.9 88 85.2 120c-13.3 32-42.1 80-85.2 120c-43.1 40-100.4 72-170.8 72s-127.7-32-170.8-72C74.1 336 45.3 288 32 256c13.3-32 42.1-80 85.2-120zM288 32c-80.8 0-145.5 36.8-192.6 80.6C48.6 156 17.3 208 2.5 243.7c-3.3 7.9-3.3 16.7 0 24.6C17.3 304 48.6 356 95.4 399.4C142.5 443.2 207.2 480 288 480s145.5-36.8 192.6-80.6c46.8-43.5 78.1-95.4 93-131.1c3.3-7.9 3.3-16.7 0-24.6c-14.9-35.7-46.2-87.7-93-131.1C433.5 68.8 368.8 32 288 32zM192 256a96 96 0 1 1 192 0 96 96 0 1 1 -192 0zm224 0a128 128 0 1 0 -256 0 128 128 0 1 0 256 0z"></path></svg>89 次浏览</p> </div> <div class="clear"></div> <p>您可以尝试运行以下代码来学习如何实现 `preload` 属性，以允许作者向浏览器提供提示，以获得最佳用户体验。适用于 `<audio>` 和 `<video>` 标签：示例 您的浏览器不支持 video 元素。</p> </div> </div> </div> <div class="clear"></div> <div class="question_section"> <div class="google_content_ads"> <div style="text-align: center;"> <div id="ezoic-pub-ad-placeholder-134"></div> <script> ezstandalone.cmd.push(function() { ezstandalone.showAds(134); }); </script> </div> </div> </div> <div class="question_section"> <div class="qa_widget"> <div class="qa_post qa_list"> <h3> <a href="https://tutorialspoint.com/How-do-we-set-an-image-to-be-shown-while-the-video-is-downloading-in-HTML" target="_blank">如何在 HTML 中设置在视频下载时显示的图像？</a> </h3> <div class="qa_category" id="tags_6977"> <a href="https://tutorialspoint.com/articles/category/HTML" target="_blank"><span>HTML</span></a><a href="https://tutorialspoint.com/articles/category/Web-Development" target="_blank"><span>网页开发</span></a><a href="https://tutorialspoint.com/articles/category/Front-End-Technology" target="_blank"><span>前端技术</span></a></div> </div> <div class="qa_answer_widget"> <a href="https://tutorialspoint.com/authors/yaswanth-verma" title="Yaswanth Varma"><img src="https://tutorialspoint.com/assets/profiles/511236/profile/60_1602256-1662106429.jpg" alt="Yaswanth Varma"></a> <div class="qa_answer_detail"> <a href="https://tutorialspoint.com/authors/yaswanth-verma" title="Yaswanth Varma">Yaswanth Varma</a> </div> <div class="flex-group"> <div class="qa_answer_dtm">更新于 2022年12月15日 15:39:43</div> <p class="views-count" title="Article Views"><svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 576 512"><path d="M117.2 136C160.3 96 217.6 64 288 64s127.7 32 170.8 72c43.1 40 71.9 88 85.2 120c-13.3 32-42.1 80-85.2 120c-43.1 40-100.4 72-170.8 72s-127.7-32-170.8-72C74.1 336 45.3 288 32 256c13.3-32 42.1-80 85.2-120zM288 32c-80.8 0-145.5 36.8-192.6 80.6C48.6 156 17.3 208 2.5 243.7c-3.3 7.9-3.3 16.7 0 24.6C17.3 304 48.6 356 95.4 399.4C142.5 443.2 207.2 480 288 480s145.5-36.8 192.6-80.6c46.8-43.5 78.1-95.4 93-131.1c3.3-7.9 3.3-16.7 0-24.6c-14.9-35.7-46.2-87.7-93-131.1C433.5 68.8 368.8 32 288 32zM192 256a96 96 0 1 1 192 0 96 96 0 1 1 -192 0zm224 0a128 128 0 1 0 -256 0 128 128 0 1 0 256 0z"></path></svg>252 次浏览</p> </div> <div class="clear"></div> <p>在这篇文章中，我们将学习如何在 HTML 中设置在视频下载时显示的图像。HTML `poster` 属性允许用户在单击播放按钮或下载视频时显示图像。否则，如果未设置 `poster` 属性，则视频的第一帧将用作海报图像。语法以下是 HTML `poster` 属性的语法。让我们深入研究以下示例，您可以在其中了解有关 HTML `poster` 属性的更多信息。示例 1 在以下示例中…… <a href="https://tutorialspoint.com/How-do-we-set-an-image-to-be-shown-while-the-video-is-downloading-in-HTML"><span class="read_more">阅读更多 <i class="fal fa-long-arrow-right"></i></span></a></p> </div> </div> </div> <div class="clear"></div> <div class="question_section"> <div class="qa_widget"> <div class="qa_post qa_list"> <h3> <a href="https://tutorialspoint.com/How-to-add-a-regular-expression-that-an-input-element-s-value-is-checked-against-in-HTML" target="_blank">如何在 HTML 中添加输入元素的值将与之进行检查的正则表达式？</a> </h3> <div class="qa_category" id="tags_6976"> <a href="https://tutorialspoint.com/articles/category/HTML" target="_blank"><span>HTML</span></a><a href="https://tutorialspoint.com/articles/category/Web-Development" target="_blank"><span>网页开发</span></a><a href="https://tutorialspoint.com/articles/category/Front-End-Technology" target="_blank"><span>前端技术</span></a></div> </div> <div class="qa_answer_widget"> <a href="https://tutorialspoint.com/authors/yaswanth-verma" title="Yaswanth Varma"><img src="https://tutorialspoint.com/assets/profiles/511236/profile/60_1602256-1662106429.jpg" alt="Yaswanth Varma"></a> <div class="qa_answer_detail"> <a href="https://tutorialspoint.com/authors/yaswanth-verma" title="Yaswanth Varma">Yaswanth Varma</a> </div> <div class="flex-group"> <div class="qa_answer_dtm">更新于 2022年12月15日 15:38:21</div> <p class="views-count" title="Article Views"><svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 576 512"><path d="M117.2 136C160.3 96 217.6 64 288 64s127.7 32 170.8 72c43.1 40 71.9 88 85.2 120c-13.3 32-42.1 80-85.2 120c-43.1 40-100.4 72-170.8 72s-127.7-32-170.8-72C74.1 336 45.3 288 32 256c13.3-32 42.1-80 85.2-120zM288 32c-80.8 0-145.5 36.8-192.6 80.6C48.6 156 17.3 208 2.5 243.7c-3.3 7.9-3.3 16.7 0 24.6C17.3 304 48.6 356 95.4 399.4C142.5 443.2 207.2 480 288 480s145.5-36.8 192.6-80.6c46.8-43.5 78.1-95.4 93-131.1c3.3-7.9 3.3-16.7 0-24.6c-14.9-35.7-46.2-87.7-93-131.1C433.5 68.8 368.8 32 288 32zM192 256a96 96 0 1 1 192 0 96 96 0 1 1 -192 0zm224 0a128 128 0 1 0 -256 0 128 128 0 1 0 256 0z"></path></svg>110 次浏览</p> </div> <div class="clear"></div> <p>我们将在本文中执行的任务是如何在 HTML 中添加输入元素的值将与之进行检查的正则表达式。将用于检查输入元素值的正则表达式由 HTML `pattern` 属性指定。以下输入类型与该属性兼容：text、password、date、search、email 等。语法以下是 HTML `pattern` 属性的语法。为了更好地了解如何在 HTML 中添加输入元素的值将与之进行检查的正则表达式，让我们来看…… <a href="https://tutorialspoint.com/How-to-add-a-regular-expression-that-an-input-element-s-value-is-checked-against-in-HTML"><span class="read_more">阅读更多 <i class="fal fa-long-arrow-right"></i></span></a></p> </div> </div> </div> <div class="clear"></div> <div class="question_section"> <div class="qa_widget"> <div class="qa_post qa_list"> <h3> <a href="https://tutorialspoint.com/How-to-display-a-short-hint-that-describes-the-expected-value-of-the-element-in-HTML" target="_blank">如何在 HTML 中显示简短提示来描述元素的预期值？</a> </h3> <div class="qa_category" id="tags_6975"> <a href="https://tutorialspoint.com/articles/category/HTML" target="_blank"><span>HTML</span></a><a href="https://tutorialspoint.com/articles/category/Web-Development" target="_blank"><span>网页开发</span></a><a href="https://tutorialspoint.com/articles/category/Front-End-Technology" target="_blank"><span>前端技术</span></a></div> </div> <div class="qa_answer_widget"> <a href="https://tutorialspoint.com/authors/Daniol-Thomas" title="Daniol Thomas"><img src="https://tutorialspoint.com/assets/profiles/13551/profile/60_130035-1512726078.jpg" alt="Daniol Thomas"></a> <div class="qa_answer_detail"> <a href="https://tutorialspoint.com/authors/Daniol-Thomas" title="Daniol Thomas">Daniol Thomas</a> </div> <div class="flex-group"> <div class="qa_answer_dtm">更新于 2020年5月31日 00:27:36</div> <p class="views-count" title="Article Views"><svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 576 512"><path d="M117.2 136C160.3 96 217.6 64 288 64s127.7 32 170.8 72c43.1 40 71.9 88 85.2 120c-13.3 32-42.1 80-85.2 120c-43.1 40-100.4 72-170.8 72s-127.7-32-170.8-72C74.1 336 45.3 288 32 256c13.3-32 42.1-80 85.2-120zM288 32c-80.8 0-145.5 36.8-192.6 80.6C48.6 156 17.3 208 2.5 243.7c-3.3 7.9-3.3 16.7 0 24.6C17.3 304 48.6 356 95.4 399.4C142.5 443.2 207.2 480 288 480s145.5-36.8 192.6-80.6c46.8-43.5 78.1-95.4 93-131.1c3.3-7.9 3.3-16.7 0-24.6c-14.9-35.7-46.2-87.7-93-131.1C433.5 68.8 368.8 32 288 32zM192 256a96 96 0 1 1 192 0 96 96 0 1 1 -192 0zm224 0a128 128 0 1 0 -256 0 128 128 0 1 0 256 0z"></path></svg>257 次浏览</p> </div> <div class="clear"></div> <p>在 HTML 中使用 `placeholder` 属性显示描述元素预期值的提示。示例您可以尝试运行以下代码来实现 `placeholder` 属性： 登录</p> </div> </div> </div> <div class="clear"></div> <div class="question_section"> <div class="qa_widget"> <div class="qa_post qa_list"> <h3> <a href="https://tutorialspoint.com/How-do-we-set-what-value-is-the-optimal-value-for-the-gauge-in-HTML" target="_blank">如何在 HTML 中设置仪表的最优值？</a> </h3> <div class="qa_category" id="tags_6974"> <a href="https://tutorialspoint.com/articles/category/HTML" target="_blank"><span>HTML</span></a><a href="https://tutorialspoint.com/articles/category/Web-Development" target="_blank"><span>网页开发</span></a><a href="https://tutorialspoint.com/articles/category/Front-End-Technology" target="_blank"><span>前端技术</span></a></div> </div> <div class="qa_answer_widget"> <a href="https://tutorialspoint.com/authors/yaswanth-verma" title="Yaswanth Varma"><img src="https://tutorialspoint.com/assets/profiles/511236/profile/60_1602256-1662106429.jpg" alt="Yaswanth Varma"></a> <div class="qa_answer_detail"> <a href="https://tutorialspoint.com/authors/yaswanth-verma" title="Yaswanth Varma">Yaswanth Varma</a> </div> <div class="flex-group"> <div class="qa_answer_dtm">更新于 2022年12月15日 15:36:44</div> <p class="views-count" title="Article Views"><svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 576 512"><path d="M117.2 136C160.3 96 217.6 64 288 64s127.7 32 170.8 72c43.1 40 71.9 88 85.2 120c-13.3 32-42.1 80-85.2 120c-43.1 40-100.4 72-170.8 72s-127.7-32-170.8-72C74.1 336 45.3 288 32 256c13.3-32 42.1-80 85.2-120zM288 32c-80.8 0-145.5 36.8-192.6 80.6C48.6 156 17.3 208 2.5 243.7c-3.3 7.9-3.3 16.7 0 24.6C17.3 304 48.6 356 95.4 399.4C142.5 443.2 207.2 480 288 480s145.5-36.8 192.6-80.6c46.8-43.5 78.1-95.4 93-131.1c3.3-7.9 3.3-16.7 0-24.6c-14.9-35.7-46.2-87.7-93-131.1C433.5 68.8 368.8 32 288 32zM192 256a96 96 0 1 1 192 0 96 96 0 1 1 -192 0zm224 0a128 128 0 1 0 -256 0 128 128 0 1 0 256 0z"></path></svg>139 次浏览</p> </div> <div class="clear"></div> <p>在本文中，我们将学习如何在 HTML 中设置仪表的最优值。最优值用于显示仪表的范围。该值必须落在范围的最小值和最大值之间。它用于指定具有摩擦值的明确定义范围内的刻度测量值。它也称为“仪表”。语法以下是 `meter` 元素的语法。注意 - 它只包含一个浮点数来表示仪表的理想值。让我们来看以下示例…… <a href="https://tutorialspoint.com/How-do-we-set-what-value-is-the-optimal-value-for-the-gauge-in-HTML"><span class="read_more">阅读更多 <i class="fal fa-long-arrow-right"></i></span></a></p> </div> </div> </div> <div class="clear"></div> <div class="job-index qa_widget" style="padding:0px 10px 0px 10px!important; margin:0px!important;"> <div class="pages"> <a href="https://tutorialspoint.com/articles/category/Web-Development/870" title="上一页"><i class="fal 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