path: root/files/zh-cn/web/api/element/mouseleave_event/index.html

---
title: mouseleave
slug: Web/API/Element/mouseleave_event
translation_of: Web/API/Element/mouseleave_event
---
<div>{{APIRef}}</div>

<p class="summary">指点设备（通常是鼠标）的指针移出某个元素时，会触发<code>mouseleave</code>事件。</p>

<p><code>mouseleave</code>  和 {{event('mouseout')}} 是相似的，但是两者的不同在于<code>mouseleave</code> 不会冒泡而<code>mouseout</code> 会冒泡。<br>
 这意味着当指针离开元素及其所有后代时，会触发<code>mouseleave</code>，而当指针离开元素或离开元素的后代（即使指针仍在元素内）时，会触发<code>mouseout</code>。</p>

<table class="standard" style="border: solid 1px;">
 <tbody>
  <tr>
   <td><img alt="mouseenter.png" class="default internal" src="/@api/deki/files/5910/=mouseleave.png"></td>
   <td><img alt="mouseover.png" class="default internal" src="/@api/deki/files/5911/=mouseout.png"></td>
  </tr>
  <tr>
   <td>当离开它们时，一个<code>mouseleave</code>事件被发送到层次结构的每个元素。当指针从文本移动到这里表示的最外面的div之外的区域时，这里4个事件会发送到层次结构的四个元素。</td>
   <td>一个单一的鼠标事件<code>mouseout</code>被发送到DOM树最深的元素，然后它冒泡层次，直到它被处理程序取消或到达根。</td>
  </tr>
 </tbody>
</table>

<p> </p>

<h2 id="一般信息">一般信息</h2>

<dl>
 <dt>规范</dt>
 <dd><a href="https://www.w3.org/TR/DOM-Level-3-Events/#event-type-mouseleave">DOM L3</a></dd>
 <dt>接口</dt>
 <dd>{{domxref("MouseEvent")}}</dd>
 <dt>是否冒泡</dt>
 <dd>否</dd>
 <dt>是否可取消</dt>
 <dd>否</dd>
 <dt>对象</dt>
 <dd>Element</dd>
 <dt>默认动作</dt>
 <dd>无</dd>
</dl>

<h2 id="属性">属性</h2>

<table class="standard-table">
 <thead>
  <tr>
   <th scope="col">Property</th>
   <th scope="col">Type</th>
   <th scope="col">Description</th>
  </tr>
 </thead>
 <tbody>
  <tr>
   <td><code>target</code> {{readonlyInline}}</td>
   <td>{{domxref("EventTarget")}}</td>
   <td>事件目标（DOM树中最顶端的目标）。</td>
  </tr>
  <tr>
   <td><code>type</code> {{readonlyInline}}</td>
   <td>{{domxref("DOMString")}}</td>
   <td>事件的类型。</td>
  </tr>
  <tr>
   <td><code>bubbles</code> {{readonlyInline}}</td>
   <td>Boolean</td>
   <td>事件是否正常冒泡</td>
  </tr>
  <tr>
   <td><code>cancelable</code> {{readonlyInline}}</td>
   <td><code>Boolean</code></td>
   <td>事件是否可以取消？</td>
  </tr>
  <tr>
   <td><code>view</code> {{readonlyInline}}</td>
   <td>{{domxref("WindowProxy")}}</td>
   <td>{{domxref("document.defaultView")}} (<code>window</code> of the document)</td>
  </tr>
  <tr>
   <td><code>detail</code> {{readonlyInline}}</td>
   <td><code>long</code> (<code>float</code>)</td>
   <td>0.</td>
  </tr>
  <tr>
   <td><code>currentTarget</code> {{readonlyInline}}</td>
   <td>{{domxref("EventTarget")}}</td>
   <td>附有事件侦听器的节​​点。</td>
  </tr>
  <tr>
   <td><code>relatedTarget</code> {{readonlyInline}}</td>
   <td>{{domxref("EventTarget")}}</td>
   <td><code>mouseover</code>, <code>mouseout</code>, <code>mouseenter</code> 和 <code>mouseleave</code> 事件: 互补事件的目标(详情查看<a href="/en-US/docs/Web/API/MouseEvent/relatedTarget">relatedTarget</a>)。</td>
  </tr>
  <tr>
   <td><code>screenX</code> {{readonlyInline}}</td>
   <td>long</td>
   <td>全局（屏幕）坐标中鼠标指针的X坐标。</td>
  </tr>
  <tr>
   <td><code>screenY</code> {{readonlyInline}}</td>
   <td>long</td>
   <td>全局（屏幕）坐标中鼠标指针的Y坐标。</td>
  </tr>
  <tr>
   <td><code>clientX</code> {{readonlyInline}}</td>
   <td>long</td>
   <td>鼠标指针在本地（DOM内容）坐标中的X坐标。</td>
  </tr>
  <tr>
   <td><code>clientY</code> {{readonlyInline}}</td>
   <td>long</td>
   <td>鼠标指针在本地（DOM内容）坐标中的Y坐标。</td>
  </tr>
  <tr>
   <td><code>button</code> {{readonlyInline}}</td>
   <td>unsigned short</td>
   <td>这总是为0，因为没有按钮按下触发这个事件（鼠标移动触发的事件）。</td>
  </tr>
  <tr>
   <td><code>buttons</code> {{readonlyInline}}</td>
   <td>unsigned short</td>
   <td>当鼠标事件被触发时按下按键：左按键= 1，右按键= 2，中（轮）按键= 4，第四按键（通常为“浏览器后退”按键）= 8，第五按键（通常为“浏览器前进“按键）= 16。如果按下两个或更多按键，则返回值的逻辑和。例如，如果按下左按键和右按键，返回3（= 1 | 2）。<a href="/en-US/docs/Web/API/MouseEvent">更多信息</a>。</td>
  </tr>
  <tr>
   <td><code>mozPressure</code> {{readonlyInline}}</td>
   <td>float</td>
   <td>生成事件时施加到触摸或tabdevice的压力量;此值介于0.0（最小压力）和1.0（最大压力）之间。</td>
  </tr>
  <tr>
   <td><code>ctrlKey</code> {{readonlyInline}}</td>
   <td>boolean</td>
   <td>
    <p>当事件触发时，Ctrl键是被按下的，则为<code>true</code> ，否则为<code>false</code></p>
   </td>
  </tr>
  <tr>
   <td><code>shiftKey</code> {{readonlyInline}}</td>
   <td>boolean</td>
   <td>当事件触发时，shift键是被按下的，则为<code>true</code> ，否则为<code>false</code></td>
  </tr>
  <tr>
   <td><code>altKey</code> {{readonlyInline}}</td>
   <td>boolean</td>
   <td>当事件触发时，alt键是被按下的，则为<code>true</code> ，否则为<code>false</code></td>
  </tr>
  <tr>
   <td><code>metaKey</code> {{readonlyInline}}</td>
   <td>boolean</td>
   <td>当事件触发时，meta键是被按下的，则为<code>true</code> ，否则为<code>false</code></td>
  </tr>
 </tbody>
</table>

<h2 id="例子">例子</h2>

<p><a href="https://developer.mozilla.org/en-US/docs/Web/Events/mouseout#Example"><code>mouseout</code> </a>文档有一个例子，说明了<code>mouseout</code>和<code>mouseleave</code>之间的区别。</p>

<p>以下示例说明了如何使用<code>mouseout</code>来模拟<code>mouseleave</code>事件的事件委托原则。</p>

<p class="brush: html"> </p>

<pre class="brush: html">&lt;ul id="test"&gt;
  &lt;li&gt;
    &lt;ul class="leave-sensitive"&gt;
      &lt;li&gt;item 1-1&lt;/li&gt;
      &lt;li&gt;item 1-2&lt;/li&gt;
    &lt;/ul&gt;
  &lt;/li&gt;
  &lt;li&gt;
    &lt;ul class="leave-sensitive"&gt;
      &lt;li&gt;item 2-1&lt;/li&gt;
      &lt;li&gt;item 2-2&lt;/li&gt;
    &lt;/ul&gt;
  &lt;/li&gt;
&lt;/ul&gt;

&lt;script&gt;
  var delegationSelector = ".leave-sensitive";

  document.getElementById("test").addEventListener("mouseout", function( event ) {
    var target = event.target,
        related = event.relatedTarget,
        match;

    // search for a parent node matching the delegation selector
    while ( target &amp;&amp; target != document &amp;&amp; !( match = matches( target, delegationSelector ) ) ) {
        target = target.parentNode;
    }

    // exit if no matching node has been found
    if ( !match ) { return; }

    // loop through the parent of the related target to make sure that it's not a child of the target
    while ( related &amp;&amp; related != target &amp;&amp; related != document ) {
        related = related.parentNode;
    }

    // exit if this is the case
    if ( related == target ) { return; }

    // the "delegated mouseleave" handler can now be executed
    // change the color of the text
    target.style.color = "orange";
    // reset the color after a small amount of time
    setTimeout(function() {
        target.style.color = "";
    }, 500);


  }, false);


  // function used to check if a DOM element matches a given selector
  // the following code can be replaced by this IE8 compatible function: https://gist.github.com/2851541
  function matches( elem, selector ) {
    if (typeof elem.matchesSelector === "function") {
      // the matchesSelector is prefixed in most (if not all) browsers
      return elem.matchesSelector( selector );
    } else if (typeof elem.matches === "function") {
      return elem.matches( selector );
​​​​​​​    }
  };
&lt;/script&gt;</pre>

<h2 id="浏览器兼容性">浏览器兼容性</h2>

{{Compat("api.Element.mouseleave_event")}}

<h2 id="相关链接">相关链接</h2>

<ul>
 <li>{{Event("mousedown")}}</li>
 <li>{{Event("mouseup")}}</li>
 <li>{{Event("mousemove")}}</li>
 <li>{{Event("click")}}</li>
 <li>{{Event("dblclick")}}</li>
 <li>{{Event("mouseover")}}</li>
 <li>{{Event("mouseout")}}</li>
 <li>{{Event("mouseenter")}}</li>
 <li>{{Event("mouseleave")}}</li>
 <li>{{Event("contextmenu")}}</li>
</ul>