files/zh-cn/web/api/element/keyup_event/index.html


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---
title: 'Element: keyup event'
slug: Web/API/Element/keyup_event
translation_of: Web/API/Element/keyup_event
---
<div>{{APIRef}}</div>

<p><strong><code>keyup</code></strong> 事件在按键被松开时触发。</p>

<table class="properties">
 <thead>
 </thead>
 <tbody>
  <tr>
   <th>冒泡</th>
   <td>是</td>
  </tr>
  <tr>
   <th>可取消</th>
   <td>是</td>
  </tr>
  <tr>
   <th>接口</th>
   <td>{{domxref("KeyboardEvent")}}</td>
  </tr>
  <tr>
   <th>事件处理函数属性</th>
   <td>{{domxref("GlobalEventHandlers.onkeyup", "onkeyup")}}</td>
  </tr>
 </tbody>
</table>

<p><code><a href="/en-US/docs/Web/API/Element/keydown_event">keydown</a></code> 和 <code>keyup</code> 事件提供指出哪个键被按下的代码，而 <code>keypress</code> 指出哪些字符被输入。例如，小写字母 “a” 在 <code>keydown</code> 和 <code>keyup</code> 时会被报告为 65，但在 <code>keypress</code> 时为 97。所有事件均将大写字母 “A” 报告为 65。</p>

<p>从 Firefox 65 开始，<code>keyup</code> 和 <code><a href="/en-US/docs/Web/API/Element/keydown_event">keydown</a></code> 事件在 IME 编辑时也会被触发，以提升 CJKT 用户的跨浏览器兼容性（{{bug(354358)}}，另请参阅 <a href="https://www.fxsitecompat.com/en-CA/docs/2018/keydown-and-keyup-events-are-now-fired-during-ime-composition/">keydown and keyup events are now fired during IME composition</a> 获取更多有用的详情）。要忽略 IME 编辑时的所有 <code>keyup</code> 事件，请执行以下操作（229 是一个关于被 IME 加工过的事件的  <code>keyCode</code> 的特殊值 ）：</p>

<pre class="brush: js">eventTarget.addEventListener("keyup", event =&gt; {
  if (event.isComposing || event.keyCode === 229) {
    return;
  }
  // do something
});
</pre>

<h2 id="例子">例子</h2>

<h3 id="addEventListener_keyup_例子">addEventListener keyup 例子</h3>

<p>在这个例子中，每当你在 {{HtmlElement("input")}} 元素里松开一个键，将会打印 {{domxref("KeyboardEvent.code")}} 的值。</p>

<pre class="brush: html">&lt;input placeholder="Click here, then press and release a key." size="40"&gt;
&lt;p id="log"&gt;&lt;/p&gt;</pre>

<pre class="brush: js">const input = document.querySelector('input');
const log = document.getElementById('log');

input.addEventListener('keyup', logKey);

function logKey(e) {
  log.textContent += ` ${e.code}`;
}</pre>

<p>{{EmbedLiveSample("addEventListener_keyup_example")}}</p>

<h3 id="等效的_onkeyup">等效的 onkeyup</h3>

<pre class="brush: js">input.onkeyup = logKey;</pre>

<h2 id="规范">规范</h2>

<table class="standard-table">
 <thead>
  <tr>
   <th scope="col">Specification</th>
   <th scope="col">Status</th>
  </tr>
 </thead>
 <tbody>
  <tr>
   <td>{{SpecName("UI Events", "#event-type-keyup")}}</td>
   <td>{{Spec2("UI Events")}}</td>
  </tr>
 </tbody>
</table>

<h2 id="浏览器兼容性">浏览器兼容性</h2>

<p>{{Compat("api.Element.keyup_event")}}</p>

<h2 id="更多">更多</h2>

<ul>
 <li><code><a href="/en-US/docs/Web/API/HTMLElement/input_event">input</a></code></li>
 <li><code><a href="/en-US/docs/Web/API/Element/keydown_event">keydown</a></code></li>
 <li><code><a href="/en-US/docs/Web/API/Element/keypress_event">keypress</a></code></li>
 <li><a href="/en-US/docs/Web/API/Document/keyup_event">Document <code>keyup</code> event</a></li>
</ul>