files/zh-cn/mozilla/tech/xul/attribute/command/index.html


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---
title: command
slug: Mozilla/Tech/XUL/Attribute/command
tags:
  - XUL Attributes
translation_of: Archive/Mozilla/XUL/Attribute/command
---
<div class="noinclude">
 <span class="breadcrumbs xulRefAttr_breadcrumbs">« <a href="/zh-CN/docs/XUL_Reference">XUL Reference home</a></span></div>
<dl>
 <dt>
  <code id="a-command"><a href="https://developer.mozilla.org/zh-CN/docs/Mozilla/Tech/XUL/Attribute/command">command</a></code></dt>
 <dd>
  Type:
  <i>
   element id</i>
 </dd>
 <dd>
  Set to the <code id="a-id"><a href="https://developer.mozilla.org/zh-CN/docs/Mozilla/Tech/XUL/Attribute/id">id</a></code> of a <code><a href="/zh-CN/docs/Mozilla/Tech/XUL/command" title="command">command</a></code> element that is being observed by the element.</dd>
</dl>
<div class="noinclude">
 <h3 id="Example" name="Example">Example</h3>
 <pre>&lt;command id="cmd_openhelp" oncommand="alert('Help');"/&gt;
&lt;button label="Help" command="cmd_openhelp"/&gt;
&lt;button label="More Help" command="cmd_openhelp"/&gt;
</pre>
 <h3 id="See_also" name="See_also">See also</h3>
 <p><code><code><a href="/zh-CN/docs/Mozilla/Tech/XUL/command" title="command">command</a></code></code> element, <code><code id="a-oncommand"><a href="https://developer.mozilla.org/zh-CN/docs/Mozilla/Tech/XUL/Attribute/oncommand">oncommand</a></code></code> and <code><code><a href="/zh-CN/docs/Mozilla/Tech/XUL/commandset" title="commandset">commandset</a></code></code></p>
</div>
<p></p>