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+---
+title: mousedown
+slug: Web/API/Element/mousedown_event
+translation_of: Web/API/Element/mousedown_event
+---
+<div>{{APIRef}}</div>
+
+<p><code>mousedown </code>事件在指针设备按钮按下时触发。</p>
+
+<h2 id="常规信息">常规信息</h2>
+
+<dl>
+ <dt style="float: left; text-align: right; width: 120px;">规范</dt>
+ <dd style="margin: 0 0 0 120px;"><a class="external" href="http://www.w3.org/TR/DOM-Level-3-Events/#event-type-mousedown">DOM L3</a></dd>
+ <dt style="float: left; text-align: right; width: 120px;">接口</dt>
+ <dd style="margin: 0 0 0 120px;">{{domxref("MouseEvent")}}</dd>
+ <dt style="float: left; text-align: right; width: 120px;">是否冒泡</dt>
+ <dd style="margin: 0 0 0 120px;">是</dd>
+ <dt style="float: left; text-align: right; width: 120px;">可取消默认行为</dt>
+ <dd style="margin: 0 0 0 120px;">是</dd>
+ <dt style="float: left; text-align: right; width: 120px;">目标对象</dt>
+ <dd style="margin: 0 0 0 120px;">元素(Element)</dd>
+ <dt style="float: left; text-align: right; width: 120px;">默认行为</dt>
+ <dd style="margin: 0 0 0 120px;">多种:开始 drag/drop 操作;开始文本选择、开始滚动或移动操作(若支持该操作时,可与鼠标中键协同) </dd>
+</dl>
+
+<h2 id="属性">属性</h2>
+
+<table class="standard-table">
+ <thead>
+ <tr>
+ <th scope="col">属性</th>
+ <th scope="col">类型</th>
+ <th scope="col">描述</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr>
+ <td><code>target</code> {{readonlyInline}}</td>
+ <td>{{domxref("EventTarget")}}</td>
+ <td>事件对应的 DOM 树顶级顶级元素</td>
+ </tr>
+ <tr>
+ <td><code>type</code> {{readonlyInline}}</td>
+ <td>{{domxref("DOMString")}}</td>
+ <td>事件类型</td>
+ </tr>
+ <tr>
+ <td><code>bubbles</code> {{readonlyInline}}</td>
+ <td>Boolean</td>
+ <td>事件是否冒泡</td>
+ </tr>
+ <tr>
+ <td><code>cancelable</code> {{readonlyInline}}</td>
+ <td><code>Boolean</code></td>
+ <td>事件是否可取消</td>
+ </tr>
+ <tr>
+ <td><code>view</code> {{readonlyInline}}</td>
+ <td>{{domxref("WindowProxy")}}</td>
+ <td>{{domxref("document.defaultView")}} (文档 <code>window</code>)</td>
+ </tr>
+ <tr>
+ <td><code>detail</code> {{readonlyInline}}</td>
+ <td><code>long</code> (<code>float</code>)</td>
+ <td>
+ <p>短时间内通过连续点击每次加一自增的计数值</p>
+ </td>
+ </tr>
+ <tr>
+ <td><code>currentTarget</code> {{readonlyInline}}</td>
+ <td>{{domxref("EventTarget")}}</td>
+ <td>挂载监听器的节点</td>
+ </tr>
+ <tr>
+ <td><code>relatedTarget</code> {{readonlyInline}}</td>
+ <td>{{domxref("EventTarget")}}</td>
+ <td>对于 <code>mouseover</code>, <code>mouseout</code>, <code>mouseenter</code> 及 <code>mouseleave</code> 事件: 该事件及其互补事件(如 <code>mouseleave</code> 对应 <code>mouseenter</code> 事件)。不存在时为 <code>null</code> </td>
+ </tr>
+ <tr>
+ <td><code>screenX</code> {{readonlyInline}}</td>
+ <td>long</td>
+ <td>
+ <p>全局屏幕坐标系下鼠标指针的 X 轴坐标值</p>
+ </td>
+ </tr>
+ <tr>
+ <td><code>screenY</code> {{readonlyInline}}</td>
+ <td>long</td>
+ <td>全局屏幕坐标系下鼠标指针的 Y 轴坐标值</td>
+ </tr>
+ <tr>
+ <td><code>clientX</code> {{readonlyInline}}</td>
+ <td>long</td>
+ <td>
+ <p>当前(DOM 元素)坐标系下鼠标指针的 X 轴坐标值</p>
+ </td>
+ </tr>
+ <tr>
+ <td><code>clientY</code> {{readonlyInline}}</td>
+ <td>long</td>
+ <td>当前(DOM 元素)坐标系下鼠标指针的 Y 轴坐标值</td>
+ </tr>
+ <tr>
+ <td><code>button</code> {{readonlyInline}}</td>
+ <td>unsigned short</td>
+ <td>
+ <p>点击事件对应的按键序号:0 为左键、1 为中键、2 为右键。在左撇子的配置环境下,按键值相反。</p>
+ </td>
+ </tr>
+ <tr>
+ <td><code>buttons</code> {{readonlyInline}}</td>
+ <td>unsigned short</td>
+ <td>
+ <p>鼠标事件触发时按下的按键值:左键为 1,右键为 2,中键为 4,第四个(如浏览器返回键)为 8,第五个(如浏览器前进键)为 16。若多个按键按下,则返回全部按下按键的逻辑值之和。例如,按下左键和右键时,返回 3 (= 1 | 2)。<a href="/en-US/docs/Web/API/MouseEvent">更多信息</a>。</p>
+ </td>
+ </tr>
+ <tr>
+ <td><code>mozPressure</code> {{readonlyInline}}</td>
+ <td>float</td>
+ <td>
+ <p>触发事件时按下触控设备的压力。该值范围最小为 0.0,最大为 1.0</p>
+ </td>
+ </tr>
+ <tr>
+ <td><code>ctrlKey</code> {{readonlyInline}}</td>
+ <td>boolean</td>
+ <td>若事件触发时 control 键按下则为 <code>true</code>,否则为 <code>false</code>。</td>
+ </tr>
+ <tr>
+ <td><code>shiftKey</code> {{readonlyInline}}</td>
+ <td>boolean</td>
+ <td>若事件触发时 shift 键按下则为 <code>true</code>,否则为 <code>false</code></td>
+ </tr>
+ <tr>
+ <td><code>altKey</code> {{readonlyInline}}</td>
+ <td>boolean</td>
+ <td>若事件触发时 alt 键按下则为 <code>true</code>,否则为 <code>false</code></td>
+ </tr>
+ <tr>
+ <td><code>metaKey</code> {{readonlyInline}}</td>
+ <td>boolean</td>
+ <td>若事件触发时 meta 键按下则为 <code>true</code>,否则为 <code>false</code></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>Feature</th>
+ <th>Chrome</th>
+ <th>Firefox (Gecko)</th>
+ <th>Internet Explorer</th>
+ <th>Edge</th>
+ <th>Opera</th>
+ <th>Safari</th>
+ </tr>
+ <tr>
+ <td>Basic support</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ </tr>
+ <tr>
+ <td>On disabled form elements</td>
+ <td>{{CompatVersionUnknown}}<sup>[1]</sup></td>
+ <td>{{CompatNo}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatNo}}</td>
+ <td>{{CompatVersionUnknown}}<sup>[1]</sup></td>
+ <td>{{CompatUnknown}}</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>Feature</th>
+ <th>Android</th>
+ <th>Edge</th>
+ <th>Firefox Mobile (Gecko)</th>
+ <th>IE Mobile</th>
+ <th>Opera Mobile</th>
+ <th>Safari Mobile</th>
+ </tr>
+ <tr>
+ <td>Basic support</td>
+ <td>{{CompatUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatUnknown}}</td>
+ <td>{{CompatUnknown}}</td>
+ <td>{{CompatUnknown}}</td>
+ <td>{{CompatUnknown}}</td>
+ </tr>
+ <tr>
+ <td>On disabled form elements</td>
+ <td>{{CompatUnknown}}</td>
+ <td>{{CompatNo}}</td>
+ <td>{{CompatUnknown}}</td>
+ <td>{{CompatUnknown}}</td>
+ <td>{{CompatUnknown}}</td>
+ <td>{{CompatUnknown}}</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<p>[1]只在{{HTMLElement("textarea")}} 以及某些{{HTMLElement("input")}} 元素上有效.</p>
+
+<h2 id="参见">参见</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>