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+---
+title: MouseEvent.which
+slug: conflicting/Web/API/UIEvent/which
+tags:
+  - API
+  - 只读
+  - 非标准
+  - 鼠标事件
+translation_of: Web/API/MouseEvent/which
+original_slug: Web/API/MouseEvent/which
+---
+<p>{{APIRef("DOM Events")}}</p>
+
+<p>{{Non-standard_header}}</p>
+
+<p>只读属性 <strong>MouseEvent.which</strong> 显示了鼠标事件是由哪个鼠标按键被按下所触发的。其他获得该信息的标准属性是 {{ domxref("MouseEvent.button") }} 与 {{ domxref("MouseEvent.buttons") }} 。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">var buttonPressed = instanceOfMouseEvent.which
+</pre>
+
+<h3 id="返回值">返回值</h3>
+
+<p>表示一个特定按键的数字：</p>
+
+<ul>
+ <li><code>0</code>: 无</li>
+ <li><code>1</code>: 左键</li>
+ <li><code>2</code>: 中间滚轮（如果有的话）</li>
+ <li><code>3</code>: 右键</li>
+</ul>
+
+<p>如果鼠标被设置为适用于左利手人士使用，那么引发的动作恰好相反。在这种情况下，该值应该从右往左看。</p>
+
+<h2 id="规范">规范</h2>
+
+<p>无规范定义该属性。</p>
+
+<h2 id="Browser_compatibility" name="Browser_compatibility">浏览器兼容性</h2>
+
+<p>{{CompatibilityTable}}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Edge</th>
+   <th>Firefox (Gecko)</th>
+   <th>Chrome</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoDesktop(1)}}<sup>[1]</sup></td>
+   <td>1.0</td>
+   <td>9.0</td>
+   <td>5.0</td>
+   <td>1.0</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Edge</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>Android</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{ CompatGeckoMobile(1) }} [1]</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<p>[1] 在 {{event("mousemove")}} 事件对象上， <code>which</code> 属性被错误地设定为 <code>1</code> {{bug(1048294)}}.</p>
+
+<h2 id="See_also" name="See_also">相关内容</h2>
+
+<ul>
+ <li>{{ domxref("MouseEvent") }}</li>
+</ul>