元素的class和id問題
一個元素有且只能有1個id，且全文中此id只能出如今一個元素上
一個元素不能寫屢次class，好比
<div class="a" class="b"></div>
這樣寫的話，第2個class會不生效（出現這個問題是由於我寫標籤時，其中的屬性過多，忘記了前面已經定義了一個class，就又寫了一個，因此後面的class就沒生效）
結果以下圖
相關文章
- 1. flex 子元素和父元素的高度相同問題
- 2. 父元素和子元素的margin-top問題
- 3. 關於經過id名獲取dom元素的問題
- 4. 004-根據ID訪問HTML元素
- 5. 按ID刪除元素 - Remove element by id
- 6. 給元素設置id
- 7. jq-獲取父元素id
- 8. 通過ID查找元素
- 9. 通過ID獲取元素
- 10. JS：處理DOM元素id命名衝突問題
- 更多相關文章...
- • RSS
, <link>, 和 <description> 元素</a> - <a href="http://www.voidme.com/rss" target="_blank" title="RSS 教程"> RSS 教程</a></li> <li> • <a href="http://www.voidme.com/rss/rss-tag-title-link-description-channel" target="_blank" title="RSS <title>, <link>, 和 <description> 元素"> RSS <title>, <link>, 和 <description> 元素</a> - <a href="http://www.voidme.com/rss" target="_blank" title="RSS 教程"> RSS 教程</a></li> <li> • <a href="http://www.voidme.com/content/cyirwnchsz-bsx" target="_blank" title="PHP Ajax 跨域問題最佳解決方案"> PHP Ajax 跨域問題最佳解決方案</a> </li> <li> • <a href="http://www.voidme.com/content/vwkpebkjwe" target="_blank" title="IntelliJ IDEA中SpringBoot properties文件不能自動提示問題解決"> IntelliJ IDEA中SpringBoot properties文件不能自動提示問題解決</a> </li> </ul> <div class="margin-top-20"></div> <div> <div></div> </div> <div class="margin-top-20"></div> <div class="relative">相關標籤/搜索</div> <ul> <a target='_blank' href="http://hk.javashuo.com/tag/%E5%85%83%E7%B4%A0" title="元素"> <span class="new-label">元素</span></a> <a target='_blank' href="http://hk.javashuo.com/tag/class" title="class"> <span class="new-label">class</span></a> <a target='_blank' href="http://hk.javashuo.com/tag/%E5%B8%B8%E5%95%8F%E5%95%8F%E9%A1%8C" title="常問問題"> <span class="new-label">常問問題</span></a> <a target='_blank' href="http://hk.javashuo.com/tag/%E5%95%8F%E9%A1%8C" title="問題"> <span class="new-label">問題</span></a> <a target='_blank' href="http://hk.javashuo.com/tag/%E5%88%86%E4%BD%88%E5%BC%8FID%E5%95%8F%E9%A1%8C" title="分佈式ID問題"> <span class="new-label">分佈式ID問題</span></a> <a target='_blank' href="http://hk.javashuo.com/tag/%E9%81%87%E5%88%B0%E7%9A%84%E5%95%8F%E9%A1%8C" title="遇到的問題"> <span class="new-label">遇到的問題</span></a> <a target='_blank' href="http://hk.javashuo.com/tag/%E5%BE%AE%E9%87%8F%E5%85%83%E7%B4%A0" title="微量元素"> <span class="new-label">微量元素</span></a> <a target='_blank' href="http://hk.javashuo.com/tag/%E5%85%83%E7%B4%A0%E7%AC%A6%E8%99%9F" title="元素符號"> <span class="new-label">元素符號</span></a> <a href="http://www.voidme.com/xlink" target="_blank" title="XLink 和 XPointer 教程"> <span class="new-label">XLink 和 XPointer 教程</span></a> <a href="http://www.voidme.com/nosql" target="_blank" title="NoSQL教程"> <span class="new-label">NoSQL教程</span></a> <a href="http://www.voidme.com/mybatis" target="_blank" title="MyBatis教程"> <span class="new-label">MyBatis教程</span></a> </ul> </div> <div class="article_social"> <div class="article_like"> <div class="circle circle-like" id="my_zan" data_id="eEvIVb6"></div> </div> <div class="clear"></div> <div class="share"> <span class="share-left bdsharebuttonbox" data-tag="share_1"> <a href="#" class="bds_more icon-share" data-cmd="more"> <span class="bds_count" data-cmd="count" title="累计分享0次">0</span> </a> </span> <div class="share-right action action-share bdsharebuttonbox" data-tag="share_1"> <span class="bdshare"> <a href="#" class="bds_sinaweibo icon-weibo" data-cmd="tsina" title="分享到新浪微博">分享到微博</a> <a href="#" class="bds_weixin icon-wechat" data-cmd="weixin" title="分享到微信">分享到微信</a> <a href="#" class="bds_qq icon-qq" data-cmd="sqq" title="分享到QQ好友">分享到QQ</a> </span> </div> </div> <div class="clear"></div> <div class="bottom_plink huodong-detail-plink-banner clearfix"> </div> </div> <script> $(function () { $("#originfo").text("https://www.cnblogs.com/JennyLin77/p/6797169.html"); $("#originfo").hover(function () { $("#originfo").attr("href", "/link?url=https://www.cnblogs.com/JennyLin77/p/6797169.html"); }, function () { $("#originfo").attr("href", "javascript:void()"); }); }); </script> <script src="http://static2.javashuo.com/static/script/article.js?time=1735430479762" type="text/javascript"></script> </div> <div class="span3 article_right_side"> <div class="right_top"> <div id="right_site_articles" class="article_detail_bg"> <div class="article-part-title"> <span>每日一句</span> </div> <ul class="side_article_list"> 每一个你不满意的现在，都有一个你没有努力的曾经。 </ul> </div><script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script> <!-- JavaShuo 侧边栏 --> <ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-6208739752673518" data-ad-slot="5830279121" data-ad-format="auto" data-full-width-responsive="true"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script> <div id="right_site_articles"> <div class="article-part-title"> <span>最新文章</span> </div> <ul class="side_article_list"> <li class="side_article_list_item">1. <a href="http://hk.javashuo.com/article/p-aoptoxir-xh.html" target="_blank" title="安裝cuda+cuDNN"> 安裝cuda+cuDNN </a> </li> <li class="side_article_list_item">2. <a href="http://hk.javashuo.com/article/p-czgeynhm-xh.html" target="_blank" title="GitHub的使用說明"> GitHub的使用說明 </a> </li> <li class="side_article_list_item">3. <a href="http://hk.javashuo.com/article/p-tynbrtpj-xh.html" target="_blank" title="phpDocumentor使用教程【安裝PHPDocumentor】"> phpDocumentor使用教程【安裝PHPDocumentor】 </a> </li> <li class="side_article_list_item">4. <a href="http://hk.javashuo.com/article/p-tbkmxugi-xh.html" target="_blank" title="yarn run build報錯Component is not found in path 「npm/taro-ui/dist/weapp/components/rate/index「"> yarn run build報錯Component is not found in path 「npm/taro-ui/dist/weapp/components/rate/index「 </a> </li> <li class="side_article_list_item">5. <a href="http://hk.javashuo.com/article/p-eqctsbck-xh.html" target="_blank" title="精講Haproxy搭建Web集羣"> 精講Haproxy搭建Web集羣 </a> </li> <li class="side_article_list_item">6. <a href="http://hk.javashuo.com/article/p-khsvzall-xh.html" target="_blank" title="安全測試基礎之MySQL"> 安全測試基礎之MySQL </a> </li> <li class="side_article_list_item">7. <a href="http://hk.javashuo.com/article/p-wvnhxlmx-xh.html" target="_blank" title="C/C++編程筆記：C語言中的複雜聲明分析，用實例帶你完全讀懂"> C/C++編程筆記：C語言中的複雜聲明分析，用實例帶你完全讀懂 </a> </li> <li class="side_article_list_item">8. <a href="http://hk.javashuo.com/article/p-yqrhvdwx-xh.html" target="_blank" title="Python3教程(1)----搭建Python環境"> Python3教程(1)----搭建Python環境 </a> </li> <li class="side_article_list_item">9. <a href="http://hk.javashuo.com/article/p-dbrdzedm-xh.html" target="_blank" title="李宏毅機器學習課程筆記2：Classification、Logistic Regression、Brief Introduction of Deep Learning"> 李宏毅機器學習課程筆記2：Classification、Logistic Regression、Brief Introduction of Deep Learning </a> </li> <li class="side_article_list_item">10. <a href="http://hk.javashuo.com/article/p-znwainfp-xh.html" target="_blank" title="阿里雲ECS配置速記"> 阿里雲ECS配置速記 </a> </li> </ul> </div> </div> <div class="operate_zone"> <div id="right_site_articles" class="article_detail_bg margin-top10"> <div class="article-part-title"> <span><a href="/contact" target="_blank">本站公眾號</a></span> </div> <div class="side_article_list user-head"> <span style="color: #5ba607;font-size:14px;"> 歡迎關注本站公眾號,獲取更多信息</span><br/> <img src="http://open.weixin.qq.com/qr/code?username=develong"/> </div> </div> <div id="right_site_articles"> <div class="article-part-title"> <span>相關文章</span> </div> <ul class="side_article_list"> <li class="side_article_list_item">1. <a href="http://hk.javashuo.com/article/p-vwryedsh-bz.html" target="_blank" title="flex 子元素和父元素的高度相同問題"> flex 子元素和父元素的高度相同問題 </a> </li> <li class="side_article_list_item">2. <a href="http://hk.javashuo.com/article/p-zvpofbqy-sc.html" target="_blank" title="父元素和子元素的margin-top問題"> 父元素和子元素的margin-top問題 </a> </li> <li class="side_article_list_item">3. <a href="http://hk.javashuo.com/article/p-ziwydmib-mv.html" target="_blank" title="關於經過id名獲取dom元素的問題"> 關於經過id名獲取dom元素的問題 </a> </li> <li class="side_article_list_item">4. <a href="http://hk.javashuo.com/article/p-uoanqnbi-su.html" target="_blank" title="004-根據ID訪問HTML元素"> 004-根據ID訪問HTML元素 </a> </li> <li class="side_article_list_item">5. <a href="http://hk.javashuo.com/article/p-pqpzbobs-bs.html" target="_blank" title="按ID刪除元素 - Remove element by id"> 按ID刪除元素 - Remove element by id </a> </li> <li class="side_article_list_item">6. <a href="http://hk.javashuo.com/article/p-vbwmtryn-pt.html" target="_blank" title="給元素設置id"> 給元素設置id </a> </li> <li class="side_article_list_item">7. <a href="http://hk.javashuo.com/article/p-stllyqqd-nz.html" target="_blank" title="jq-獲取父元素id"> jq-獲取父元素id </a> </li> <li class="side_article_list_item">8. <a href="http://hk.javashuo.com/article/p-okiuhhdl-wb.html" target="_blank" title="通過ID查找元素"> 通過ID查找元素 </a> </li> <li class="side_article_list_item">9. <a href="http://hk.javashuo.com/article/p-cpsscjts-rn.html" target="_blank" title="通過ID獲取元素"> 通過ID獲取元素 </a> </li> <li class="side_article_list_item">10. <a href="http://hk.javashuo.com/article/p-suiiysmh-hp.html" target="_blank" title="JS：處理DOM元素id命名衝突問題"> JS：處理DOM元素id命名衝突問題 </a> </li> </ul> <div style='padding-left:10px;font-size:14px;padding-bottom:10px;'> <a href='http://hk.javashuo.com/relative/p-gcerhuzi-ke.html' target='_blank' title="元素的class和id問題 的相關文章"> >>更多相關文章<< </a> </div> </div> </div> </div> </div> <script type="text/javascript"> $('table').each(function (i) { var size = $(this).children().size(); if (size > 1) { $(this).attr('class', "table table-bordered"); } else if (size == 1) { var e11 = $(this).children(":first"); var e1 = e11[0]; var name = e1.nodeName.toLowerCase(); if ("tbody" == name) { if (e1.children.length > 1) { $(this).attr('class', "table table-bordered"); } else if (e1.children.length == 1) { var e12 = e1.children[0]; var name2 = e12.nodeName.toLowerCase(); if ("tr" == name2) { if (e12.children.length > 1) { $(this).attr('class', "table table-bordered"); } } } } } }); window.page = 0; window.last = 0; window.first = true; resize_article_image('#nei', 550); + (function($){ window._bd_share_config = { common: { "bdText": "【" + $("title").text() + "】" + $(".post-content p:lt(2)").text(), "bdMini": "2", "bdMiniList": false, "bdPic": $(".post-content img:first") ? $(".post-content img:first").attr("src") : "", "bdStyle": "0", "bdSize": "24" }, share: [{ bdCustomStyle: 'http://static2.javashuo.com/static/css/share.css' }], }; with(document) 0[(getElementsByTagName("head")[0] || body).appendChild(createElement("script")).src = "http://bdimg.share.baidu.com/static/api/js/share.js?cdnversion=" + ~ ( - new Date() / 36e5)]; })(window.jQuery); </script> </div> <script type="text/javascript" src="http://static2.javashuo.com/static/plugin/highlight/highlight.pack.js"></script> <link href="http://static2.javashuo.com/static/plugin/highlight/styles/docco.css" media="screen" rel="stylesheet" type="text/css" /> <script type="text/javascript"> $('pre').each(function(i, e) { hljs.highlightBlock(e, "<span class='indent'> </span>", false) }); </script> <div class="footer"> <div class="footer-inner" style="padding-top: 50px;padding-bottom: 50px"> <a href="http://hk.javashuo.com/contact" target="_blank">聯繫我們</a> <a href="http://hk.javashuo.com/search">最近搜索</a> <a href="http://hk.javashuo.com/recent">最新文章</a> <script type="text/javascript" src="https://v1.cnzz.com/z_stat.php?id=1279585947&web_id=1279585947"></script> <a href="https://beian.miit.gov.cn/" target="_blank">沪ICP备13005482号-10</a> <a href="http://www.voidme.com/mybatis" target="_blank">MyBatis教程</a> <a href="http://www.voidme.com/sql" target="_blank">SQL 教程</a> <a href="http://www.voidme.com/mysql" target="_blank">MySQL教程</a> <a href="http://www.voidme.com/java" target="_blank">Java 教程</a> <a href="http://www.voidme.com/thymeleaf" target="_blank">Thymeleaf 教程</a> <a href="http://www.voidme.com/hibernate" target="_blank">Hibernate教程</a> <a href="http://www.voidme.com/spring" target="_blank">Spring教程 </a> <a href="http://www.voidme.com/redis" target="_blank">Redis教程 </a> </div> <div style="display:none;"> <script> var _hmt = _hmt || []; (function() { var hm = document.createElement("script"); hm.src = "https://hm.baidu.com/hm.js?2936bf9a19a3d5abb5c9c726af070b7c"; var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(hm, s); })(); </script> </div> </div> <script type="text/javascript" src="http://static2.javashuo.com/static/script/tip.js?time=1735430479762" async></script> </body> </html>