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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
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+---
+title: <input type="checkbox">
+slug: Web/HTML/Element/Input/checkbox
+translation_of: Web/HTML/Element/input/checkbox
+---
+<p><span class="seoSummary">HTML input元素 <strong><code>&lt;input type="checkbox"&gt;</code></strong> 允许你为表单中(或不在表单中)的提交项选择一个单一值。</span></p>
+
+<div class="note">
+<p><strong>注意</strong>: 若表单提交时,checkbox未勾选,则提交的值并非为value=unchecked;此时的值不会被提交到服务器。</p>
+</div>
+
+<h2 id="属性">属性</h2>
+
+<p>该元素包含<a href="https://developer.mozilla.org/zh-CN/docs/Web/HTML/Global_attributes">全局属性</a>。</p>
+
+<dl>
+ <dt>{{htmlattrdef("checked")}}</dt>
+ <dd>
+ <p>当<strong>type</strong>属性的值为<code>checkbox时</code>, 这个属性的存在表示input是否默认被选中。你可以将该属性设置为<code>checked="checked",</code>或更简单地只设置为<code>checked。</code></p>
+ </dd>
+ <dt>{{htmlattrdef("value")}}</dt>
+ <dd>指定input的值。如果省略,获取该元素的值的结果为字符串"on"。<br>
+ 请注意,如果value值发生改变后页面重新加载,Gecko和IE<a href="https://bugzilla.mozilla.org/show_bug.cgi?id=46845#c186">会忽略HTML源代码中设置的value值</a>。</dd>
+ <dt>{{htmlattrdef("indeterminate")}}</dt>
+ <dd>指定checkbox处于不定状态(在大多数平台,这样会产生一个划过checkbox的横线)。</dd>
+</dl>
+
+<h2 id="示例">示例</h2>
+
+<pre class="brush: html">&lt;p&gt;
+ &lt;input type="checkbox" id="cbox1" value="first_checkbox"&gt;
+ &lt;label for="cbox1"&gt;This is the first checkbox&lt;/label&gt;
+&lt;/p&gt;
+&lt;p&gt;
+ &lt;input type="checkbox" id="cbox2" value="second_checkbox" checked="checked"&gt;
+ &lt;label for="cbox2"&gt;This is the second checkbox, which is checked&lt;/label&gt;
+&lt;/p&gt;
+</pre>
+
+<p>以上代码将产生2个checkbox,如下所示:</p>
+
+<p>{{EmbedLiveSample("Example")}}</p>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <td>规范</td>
+ <td>状态</td>
+ </tr>
+ <tr>
+ </tr>
+ <tr>
+ <td>{{SpecName('HTML WHATWG', 'forms.html#checkbox-state-(type=checkbox)', '&lt;checkbox&gt;')}}</td>
+ <td>{{Spec2('HTML WHATWG')}}</td>
+ <td> </td>
+ </tr>
+ <tr>
+ <td>{{SpecName('HTML5 W3C', 'forms.html#checkbox-state-(type=checkbox)', '&lt;checkbox&gt;')}}</td>
+ <td>{{Spec2('HTML5 W3C')}}</td>
+ <td> </td>
+ </tr>
+ <tr>
+ <td>{{SpecName('HTML4.01', 'interact/forms.html#checkbox', '&lt;checkbox&gt;')}}</td>
+ <td>{{Spec2('HTML4.01')}}</td>
+ <td> </td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<p>{{CompatibilityTable}}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>特性</th>
+ <th>Chrome</th>
+ <th>Firefox (Gecko)</th>
+ <th>Internet Explorer</th>
+ <th>Opera</th>
+ <th>Safari</th>
+ </tr>
+ <tr>
+ <td>基本支持</td>
+ <td>1.0</td>
+ <td>{{CompatGeckoDesktop("1.7 or earlier")}}</td>
+ <td>2 or earlier</td>
+ <td>1.0</td>
+ <td>1.0</td>
+ </tr>
+ <tr>
+ <td>type=checkbox</td>
+ <td>1.0</td>
+ <td>{{CompatGeckoDesktop("1.7 or earlier")}}<br>
+ {{CompatGeckoDesktop("1.9.2")}} for <code>indeterminate</code> value</td>
+ <td>2</td>
+ <td>1.0</td>
+ <td>1.0</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>特性</th>
+ <th>Android</th>
+ <th>Firefox Mobile (Gecko)</th>
+ <th>IE Mobile</th>
+ <th>Opera Mobile</th>
+ <th>Safari Mobile</th>
+ </tr>
+ <tr>
+ <td>基本支持</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatGeckoMobile("2.0")}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ </tr>
+ <tr>
+ <td>type=checkbox</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ </tr>
+ </tbody>
+</table>
+</div>