在開發(fā)網(wǎng)頁時，我們經(jīng)常需要設(shè)置輸入框的必填和非必填樣式。CSS3中提供了兩個偽類選擇器，即:required和:optional，可以方便地實現(xiàn)這一需求。步驟一：創(chuàng)建Web項目首先，雙擊打開HBuil
在開發(fā)網(wǎng)頁時，我們經(jīng)常需要設(shè)置輸入框的必填和非必填樣式。CSS3中提供了兩個偽類選擇器，即:required和:optional，可以方便地實現(xiàn)這一需求。
步驟一：創(chuàng)建Web項目
首先，雙擊打開HBuilder開發(fā)工具，并創(chuàng)建一個新的Web項目。在項目的page文件夾下新建一個頁面文件，用于演示示例代碼。
步驟二：修改title標簽內(nèi)容
打開已新建的頁面文件，在
標簽中找到
標簽，并修改其內(nèi)容為適當?shù)臉祟}。</p><p><h2>步驟三：插入form表單和輸入框</h2></p><p>在<body>標簽中插入一個<form>標簽，用于包裹輸入框。然后在<form>標簽內(nèi)部插入三個<input>標簽，分別用于展示不同樣式的輸入框。前兩個輸入框添加屬性required，表示它們是必填項。</p><p><h2>步驟四：使用:required偽類選擇器設(shè)置樣式</h2></p><p>在頁面中添加一個<style>標簽，利用:required偽類選擇器設(shè)置必填輸入框的邊框顏色和寬度。通過選擇器設(shè)置樣式，可以輕松地改變輸入框的外觀。</p><p><h2>步驟五：保存并運行頁面</h2></p><p>保存代碼并運行頁面文件，打開瀏覽器，可以看到前兩個輸入框的邊框顏色和寬度已經(jīng)被設(shè)置成了指定樣式。這樣用戶在填寫表單時，就能明確地知道哪些是必填項。</p><p><h2>步驟六：使用:optional偽類選擇器設(shè)置非必填輸入框樣式</h2></p><p>如果還有其他的輸入框不是必填項，我們可以使用:optional偽類選擇器來設(shè)置它們的樣式。通過設(shè)置邊框顏色和寬度等樣式，可以讓這些輸入框與必填項有所區(qū)別。</p><p>以上就是使用CSS3中的:required和:optional偽類選擇器來設(shè)置輸入框樣式的步驟。通過這些偽類選擇器，我們可以方便地為輸入框添加必填和非必填樣式，提升用戶體驗。</p> </div>
<!-- 文章中間廣告位 -->
<!--
<div id="ldjh7rx" class="ad-container ad-content-middle">
<div id="rxrn1fn" class="ad-wrapper">
<span id="bzdrrbp" class="ad-label">廣告</span>
<div id="rh3fnfv" class="ad-content">
<img src="path/to/ad3.jpg" alt="廣告">
</div>
</div>
</div>
-->
<footer class="article-footer">
<div id="vrbb79z" class="tags">
<span id="3pljhld" class="tag-label">標簽：</span> </div>
<div id="bvj91v3" class="share-box">
<span id="fhjvnp7" class="share-label">分享到：</span>
<button class="share-btn weixin" title="分享到微信">
<i class="ri-wechat-fill"></i>
</button>
<button class="share-btn qq" title="分享到QQ">
<i class="ri-qq-fill"></i>
</button>
</div>
</footer>
</article>
<div id="3xv3vpj" class="ad-container ad-footer">
<div id="bfrlnll" class="ad-wrapper">
<div class="zlrtjx1" id="adshow2"></div>
<!--
<span id="h5rbtdp" class="ad-label">廣告</span>
<div id="htp3ld9" class="ad-content">
<img src="path/to/ad4.jpg" alt="廣告">
</div>-->
</div>
</div>
<!-- 上下文導航 -->
<nav class="context-nav">
<a href="/news/7263765.html" class="nav-item prev">
<i class="ri-arrow-left-s-line"></i>
<span id="3z1vv3r" class="nav-text">
<span id="1h1bjdf" class="label">上一篇</span>
<span id="bhllxjv" class="title">如何提高電腦屏幕的分辨率</span>
</span>
</a>
<a href="/news/7263767.html" class="nav-item next">
<span id="7hv9nl7" class="nav-text">
<span id="dtvvrnh" class="label">下一篇</span>
<span id="hzvj9zp" class="title">如何操作來更改WPS圖形的填充效果</span>
</span>
<i class="ri-arrow-right-s-line"></i>
</a>
</nav>
<!-- 相關(guān)推薦 -->
<section class="related-articles">
<h2 class="section-title">
<span>相關(guān)推薦</span>
</h2>
<div id="fvdxh9l" class="articles-grid">
<a href="/news/7914749.html" class="article-item">
<span id="dhntppt" class="article-title">使用Mathematica輔助學習線性代數(shù)</span>
<span id="px5nb79" class="article-date">2024-08-14</span>
</a>
<a href="/news/7914750.html" class="article-item">
<span id="n9tdhfh" class="article-title">Excel表格如何查詢文檔修改時間</span>
<span id="nx5l5hx" class="article-date">2024-08-14</span>
</a>
<a href="/news/7914751.html" class="article-item">
<span id="jjvfznj" class="article-title">智慧團建驗證碼顯示不出來怎么辦</span>
<span id="3r3fnlz" class="article-date">2024-08-14</span>
</a>
<a href="/news/7914752.html" class="article-item">
<span id="rndjxjp" class="article-title">如何將PPT文檔轉(zhuǎn)換成圖片？詳細步驟請看下文。</span>
<span id="zz3jhdl" class="article-date">2024-08-14</span>
</a>
<a href="/news/7914753.html" class="article-item">
<span id="l1rnhrz" class="article-title">如何制作“掌中地球”創(chuàng)意圖片？</span>
<span id="vrl1nhb" class="article-date">2024-08-14</span>
</a>
<a href="/news/7914754.html" class="article-item">
<span id="r3rrxl3" class="article-title">如何取消WPS文檔的密碼保護？</span>
<span id="fzjzfpz" class="article-date">2024-08-14</span>
</a>
<a href="/news/7914755.html" class="article-item">
<span id="71jbxnp" class="article-title">如何利用SmartArt快速處理PPT中的結(jié)構(gòu)化內(nèi)容</span>
<span id="rvn1ntb" class="article-date">2024-08-14</span>
</a>
<a href="/news/7914756.html" class="article-item">
<span id="lb3prvv" class="article-title">如何找到并刪除給QQ好友發(fā)送的離線文件</span>
<span id="b9hzldv" class="article-date">2024-08-14</span>
</a>
</div>
</section>
<!-- 返回頂部按鈕 -->
<button class="back-to-top" aria-label="返回頂部">
<i class="ri-arrow-up-line"></i>
</button>
</div>
</div>
</main>
<!-- 頁面底部 -->
<!-- 網(wǎng)站底部 -->
<footer class="footer">
<div id="xjhxxfr" class="footer-content">
<!-- 主要內(nèi)容區(qū)域 -->
<div id="95xnrnf" class="footer-main">
<!-- 鏈接區(qū)域 -->
<div id="rpltnpx" class="footer-links">
<div id="vltnxj1" class="footer-column">
<h4>幫助支持</h4>
<ul>
<li><a href="/help/bzzx.html">幫助中心</a></li>
<li><a href="/Home/User/">用戶中心</a></li>
<li><a href="/sitemap.xml">網(wǎng)站地圖</a></li>
</ul>
</div>
<div id="fzrxdpv" class="footer-column">
<h4>支付服務</h4>
<ul>
<li><a href="/help/fkfs.html">付款方式</a></li>
<li><a href="/help/fkfs.html">域名賬戶</a></li>
<li><a href="/help/jyfl.html">服務費率</a></li>
</ul>
</div>
<div id="jlrdzjv" class="footer-column">
<h4>規(guī)則條款</h4>
<ul>
<li><a href="/help/jygz.html">交易規(guī)則</a></li>
<li><a href="/help/yssm.html">隱私聲明</a></li>
<li><a href="/help/fwxy.html">服務協(xié)議</a></li>
</ul>
</div>
<div id="5nl3ddj" class="footer-column">
<h4>聯(lián)系我們</h4>
<ul>
<li><a href="/help/lxjjr.html">業(yè)務咨詢</a></li>
<li><a >投訴建議</a></li>
<li><a href="/help/lxwm.html">聯(lián)系我們</a></li>
</ul>
</div>
<div id="1rnrbvl" class="footer-column">
<h4>關(guān)于我們</h4>
<ul>
<li><a href="/help/gywm.html">關(guān)于我們</a></li>
<li><a href="/help/cpyc.html">誠聘英才</a></li>
<li><a href="/Home/agent/login.html">經(jīng)紀登錄</a></li>
</ul>
</div>
</div>
<!-- 二維碼區(qū)域 -->
<div id="1pbn1h5" class="qr-codes">
<div id="h7pbfd1" class="qr-item">
<img src="/styles/images/z-p2.jpg" alt="微信公眾號">
<p>微信公眾號</p>
</div>
<div id="jnbf1tf" class="qr-item">
<img src="/styles/images/z-p3.jpg" alt="微信小程序">
<p>微信小程序</p>
</div>
</div>
</div>
<!-- 公司信息 -->
<div id="ljbjt1x" class="company-info">
<p>
大連酷米科技有限公司
<span id="frpf5x5" class="separator">|</span>
電話: 0411-88255560
<span id="bpltb9p" class="separator">|</span>
員工舞弊舉報: mi@kmw.com
<span id="rfzdhrj" class="separator">|</span>
地址: 遼寧省大連市甘井子區(qū)華南廣場中南大廈A座612
</p>
</div>
<!-- 備案信息 -->
<div id="nfbh39p" class="certificates">
<p class="license">
<a target="_blank">遼ICP備2023003160號-1</a>
<span id="fjhrjj9" class="separator">|</span>
增值電信業(yè)務經(jīng)營許可證：遼B2-20230432
<span id="jld3lrt" class="separator">|</span>
在線數(shù)據(jù)處理與交易許可證：遼B2-20230432
<span id="nbtt1fp" class="separator">|</span>
<a target="_blank">遼公網(wǎng)安備 21021102000934號</a>
</p>
<p class="copyright">Copyright ? 2014-2025 酷米科技 版權(quán)所有</p>
</div>
<!-- 認證圖標 -->
<div id="rb9jxnt" class="cert-icons">
<img src="/styles/images/icon-1.png" alt="認證圖標1">
<img src="/styles/images/icon-2.png" alt="認證圖標2">
<img src="/styles/images/icon-3.png" alt="認證圖標3">
<img src="/styles/images/icon-4.png" alt="認證圖標4">
<img src="/styles/images/icon-5.png" alt="認證圖標5">
<img src="/styles/images/icon-6.png" alt="認證圖標6">
</div>
</div>
</footer>
<!-- 引入jQuery -->
<!-- 引入頁面特定的JS -->
<!-- 在其他腳本之前添加 -->
<footer>
<div class="friendship-link">
<p>感谢您访问我们的网站，您可能还对以下资源感兴趣：</p>
<a href="http://www.51jto.cn/" title="卖逼视频免费看片|狼人就干网中文字慕|成人av影院导航|人妻少妇精品无码专区二区妖婧|亚洲丝袜视频玖玖|一区二区免费中文|日本高清无码一区|国产91无码小说|国产黄片子视频91sese日韩|免费高清无码成人网站入口">卖逼视频免费看片|狼人就干网中文字慕|成人av影院导航|人妻少妇精品无码专区二区妖婧|亚洲丝袜视频玖玖|一区二区免费中文|日本高清无码一区|国产91无码小说|国产黄片子视频91sese日韩|免费高清无码成人网站入口</a>
<div class="friend-links">
<a href="http://www.csstj.com.cn">婷婷社区视频在线|老司机视频网站草草|牛牛成人在线视频|精品国产一区二区三区香蕉_国产极品…|激情性爱视频网站|色老头丁香五月密|手机AV在线播放|无码专区蜜牙–av|婷婷久久久久一区二区|色噜噜无码加勒比久久</a>
<a href="http://www.jspxyx.cn">一区黄色电影在线|青青草伊人啪88|国产成入在线视频|亚洲中文不卡无码|伊人久久精品网站|青青草原日韩综合网|高级精品福利在线|人人做爱视频网站|欧美另类在线亚洲|激情小说久久6亚洲电影av综合</a>
<a href="http://www.bbxwb.cn">久久精品成人成人精品视频,|av在线自h91|竹菊影视无码AV|中文字幕一区二区波多野结衣|国产精品男女插插|午夜亚洲经典在线|特黄一区二区二区|久久亚洲色。视频|www.久久久久|亚洲无码高清视屏</a>
</div>
</div>
</footer>
<script>
(function(){
var bp = document.createElement('script');
var curProtocol = window.location.protocol.split(':')[0];
if (curProtocol === 'https') {
bp.src = 'https://zz.bdstatic.com/linksubmit/push.js';
}
else {
bp.src = 'http://push.zhanzhang.baidu.com/push.js';
}
var s = document.getElementsByTagName("script")[0];
s.parentNode.insertBefore(bp, s);
})();
</script>
</body><div id="3tz1h" class="pl_css_ganrao" style="display: none;"><address id="3tz1h"><rp id="3tz1h"></rp></address><legend id="3tz1h"></legend><tt id="3tz1h"><video id="3tz1h"></video></tt><listing id="3tz1h"><style id="3tz1h"><big id="3tz1h"><small id="3tz1h"></small></big></style></listing><video id="3tz1h"><strong id="3tz1h"></strong></video><legend id="3tz1h"><sub id="3tz1h"></sub></legend><pre id="3tz1h"><ins id="3tz1h"><output id="3tz1h"><dfn id="3tz1h"></dfn></output></ins></pre><dfn id="3tz1h"></dfn><i id="3tz1h"><address id="3tz1h"><dfn id="3tz1h"><strong id="3tz1h"></strong></dfn></address></i><meter id="3tz1h"></meter><form id="3tz1h"><small id="3tz1h"></small></form><big id="3tz1h"><ins id="3tz1h"><dfn id="3tz1h"><ol id="3tz1h"></ol></dfn></ins></big><dfn id="3tz1h"></dfn><meter id="3tz1h"><u id="3tz1h"><i id="3tz1h"><address id="3tz1h"></address></i></u></meter><ins id="3tz1h"></ins><ins id="3tz1h"></ins><font id="3tz1h"><u id="3tz1h"></u></font><span id="3tz1h"><font id="3tz1h"><optgroup id="3tz1h"><ol id="3tz1h"></ol></optgroup></font></span><tt id="3tz1h"></tt><output id="3tz1h"></output><progress id="3tz1h"></progress><progress id="3tz1h"><ruby id="3tz1h"><form id="3tz1h"><dl id="3tz1h"></dl></form></ruby></progress><var id="3tz1h"><legend id="3tz1h"><sub id="3tz1h"><u id="3tz1h"></u></sub></legend></var><mark id="3tz1h"><track id="3tz1h"><label id="3tz1h"><span id="3tz1h"></span></label></track></mark><address id="3tz1h"><mark id="3tz1h"><nobr id="3tz1h"><p id="3tz1h"></p></nobr></mark></address><menuitem id="3tz1h"><th id="3tz1h"></th></menuitem><optgroup id="3tz1h"><div id="3tz1h"><big id="3tz1h"><rp id="3tz1h"></rp></big></div></optgroup><ol id="3tz1h"><address id="3tz1h"></address></ol><nobr id="3tz1h"></nobr><menuitem id="3tz1h"><form id="3tz1h"></form></menuitem><nobr id="3tz1h"></nobr><p id="3tz1h"></p><strong id="3tz1h"></strong><legend id="3tz1h"><div id="3tz1h"><small id="3tz1h"><strong id="3tz1h"></strong></small></div></legend><output id="3tz1h"><u id="3tz1h"><label id="3tz1h"><address id="3tz1h"></address></label></u></output><div id="3tz1h"><mark id="3tz1h"><nobr id="3tz1h"><pre id="3tz1h"></pre></nobr></mark></div><thead id="3tz1h"></thead><th id="3tz1h"><strike id="3tz1h"><form id="3tz1h"><tt id="3tz1h"></tt></form></strike></th><strong id="3tz1h"><strike id="3tz1h"><progress id="3tz1h"><ruby id="3tz1h"></ruby></progress></strike></strong><label id="3tz1h"></label><thead id="3tz1h"><dfn id="3tz1h"><sup id="3tz1h"><form id="3tz1h"></form></sup></dfn></thead><rp id="3tz1h"><dfn id="3tz1h"><ol id="3tz1h"><thead id="3tz1h"></thead></ol></dfn></rp><b id="3tz1h"></b><pre id="3tz1h"><font id="3tz1h"></font></pre><strike id="3tz1h"><meter id="3tz1h"></meter></strike><thead id="3tz1h"></thead><acronym id="3tz1h"><meter id="3tz1h"></meter></acronym><font id="3tz1h"></font><progress id="3tz1h"></progress><rp id="3tz1h"><dfn id="3tz1h"></dfn></rp><thead id="3tz1h"><address id="3tz1h"><rp id="3tz1h"><strong id="3tz1h"></strong></rp></address></thead><pre id="3tz1h"><ins id="3tz1h"></ins></pre><var id="3tz1h"><span id="3tz1h"></span></var><em id="3tz1h"><nobr id="3tz1h"></nobr></em><listing id="3tz1h"><legend id="3tz1h"><big id="3tz1h"><small id="3tz1h"></small></big></legend></listing><div id="3tz1h"><thead id="3tz1h"><nobr id="3tz1h"><sup id="3tz1h"></sup></nobr></thead></div><span id="3tz1h"></span><em id="3tz1h"></em><dl id="3tz1h"></dl><nobr id="3tz1h"><label id="3tz1h"><span id="3tz1h"><rp id="3tz1h"></rp></span></label></nobr><form id="3tz1h"></form><dl id="3tz1h"><ins id="3tz1h"><th id="3tz1h"><strike id="3tz1h"></strike></th></ins></dl><ruby id="3tz1h"><listing id="3tz1h"></listing></ruby><legend id="3tz1h"></legend><div id="3tz1h"><thead id="3tz1h"></thead></div><var id="3tz1h"><span id="3tz1h"></span></var><tt id="3tz1h"></tt><span id="3tz1h"></span><big id="3tz1h"></big><pre id="3tz1h"></pre><strong id="3tz1h"><pre id="3tz1h"><menuitem id="3tz1h"><form id="3tz1h"></form></menuitem></pre></strong><strong id="3tz1h"></strong><menuitem id="3tz1h"><th id="3tz1h"><label id="3tz1h"><pre id="3tz1h"></pre></label></th></menuitem><i id="3tz1h"></i><mark id="3tz1h"></mark><th id="3tz1h"></th><rp id="3tz1h"><listing id="3tz1h"><acronym id="3tz1h"><thead id="3tz1h"></thead></acronym></listing></rp><p id="3tz1h"></p><strong id="3tz1h"><strike id="3tz1h"><form id="3tz1h"><ruby id="3tz1h"></ruby></form></strike></strong><tt id="3tz1h"><form id="3tz1h"></form></tt><label id="3tz1h"><pre id="3tz1h"></pre></label><dfn id="3tz1h"></dfn><thead id="3tz1h"><track id="3tz1h"><sup id="3tz1h"><progress id="3tz1h"></progress></sup></track></thead><thead id="3tz1h"></thead><tt id="3tz1h"><listing id="3tz1h"><acronym id="3tz1h"><mark id="3tz1h"></mark></acronym></listing></tt><legend id="3tz1h"></legend><form id="3tz1h"></form><dl id="3tz1h"><sub id="3tz1h"></sub></dl><progress id="3tz1h"></progress><b id="3tz1h"></b><nobr id="3tz1h"></nobr><em id="3tz1h"><rp id="3tz1h"><strong id="3tz1h"><div id="3tz1h"></div></strong></rp></em><mark id="3tz1h"><small id="3tz1h"></small></mark><var id="3tz1h"><big id="3tz1h"></big></var><progress id="3tz1h"></progress><small id="3tz1h"></small><var id="3tz1h"><legend id="3tz1h"><output id="3tz1h"><label id="3tz1h"></label></output></legend></var><pre id="3tz1h"><progress id="3tz1h"></progress></pre><output id="3tz1h"><dfn id="3tz1h"><i id="3tz1h"><address id="3tz1h"></address></i></dfn></output><div id="3tz1h"></div></div>
</html> 