时间：2021-07-01 10:21:17 帮助过：3人阅读
/ autocomplete 属性autocomplete 属性规定 form 或 input 域应该拥有自动完成功能。当用户在自动完成域中开始输入时，浏览器应该在该域中显示填写的选项。提示: autocomplete 属性有可能在 form元素中是开启的，而在input元素中是关闭的。注意: autocomplete 适用于
还可以用 for 属性指定输出元素和文档中影响计算的其他元素之间的关系（比如，作为输入源或者参数）。for 属性的值是一个由空格分隔的其他元素的 IDs 列表。
placeholder 属性HTML5 引入了一个叫做 palceholder 的新属性。这个属性在 和 元素上为用户提供了在这个字段可以输入什么的提示。占位符字符不能包含回车符或者换行符。<br />下面是 placeholder 属性的简单语法：<br /></p> <pre class="brush:js;"><script type="text/html" style='display:block'> <div class="codeHead"><span class="lantxt">XML/HTML Code</span><span style="CURSOR: pointer" class="copyCodeText" onclick="copyIdText('code_1536')">复制内容到剪贴板</span></div> <div id="code_1536"> <ol class="dp-xml"> <li class="alt"><span><span class="tag"><</span><span class="tag-name">input</span><span> </span><span class="attribute">type</span><span>=</span><span class="attribute-value">"text"</span><span> </span><span class="attribute">name</span><span>=</span><span class="attribute-value">"search"</span><span> </span><span class="attribute">placeholder</span><span>=</span><span class="attribute-value">"search the web"</span><span class="tag">/></span><span> </span></span></li> </ol> </div> </div> <p>这个属性只有最新版的 Mozilla，Safari 以及 Chrome 浏览器支持。</p> <p><br /><strong>required 属性<br /></strong>现在，我们不需要使用 JavaScript 处理诸如空文本框永远不能被提交的这类客户端验证了，因为 HTML5 引入了一个叫做 required 的新属性，可以按照如下方式使用，它会保证输入框有值：<br /></p> <pre class="brush:js;"><script type="text/html" style='display:block'> <div class="codeHead"><span class="lantxt">XML/HTML Code</span><span style="CURSOR: pointer" class="copyCodeText" onclick="copyIdText('code_2864')">复制内容到剪贴板</span></div> <div id="code_2864"> <ol class="dp-xml"> <li class="alt"><span><span class="tag"><</span><span class="tag-name">input</span><span> </span><span class="attribute">type</span><span>=</span><span class="attribute-value">"text"</span><span> </span><span class="attribute">name</span><span>=</span><span class="attribute-value">"search"</span><span> required</span><span class="tag">/></span><span> </span></span></li> </ol> </div> </div> <p>这个属性只有最新版的 Mozilla，Safari 以及 Chrome 浏览器支持。 </div> <div class=""> <ul class="m-news-opt fix"> <li class="opt-item"> <a href='/htmldaima-282077.html' target='_blank'><p>< 上一篇</p><p 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