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src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-6502133150423173" crossorigin="anonymous" ></script> <ins class="adsbygoogle" style="display: block; text-align: center" data-ad-layout="in-article" data-ad-format="fluid" data-ad-client="ca-pub-6502133150423173" data-ad-slot="5397914957" ></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script> </p> <!-- --> <!-- --> <h3 id="Summary"><a href="#Summary" title="Permalink to 概述">概述</a></h3><p>返回主内容窗口的<a href="/wiki/zh-CN/docs/Web/API/Window/zh-CN/DOM/window">Window对象</a>.该属性只在包含有属性<code>type="content-primary"</code>的<code><browser></code> (或者 <code>tabbrowser</code> 或者 <code><iframe></code>)标签的XUL窗口下才会用到.最常用到的地方就是Firefox的主窗口, <code>browser.xul</code>. 在这种情况下, <code>content</code> 返回一个浏览器中的当前页面的<code>Window对象的引用</code>.相当于<code><var>browserRef</var>.contentWindow的快捷方式</code>.</p> <p>在一个非特权的内容窗口中 (网页), <code>content</code> 等同于普通的 <a href="/wiki/zh-CN/docs/Web/API/Window/zh-CN/DOM/window.top">top</a> (除非网页是在侧边栏中加载的, <code>content</code>仍然会指向当前标签页中的<code>Window对象</code>).</p> <p>一些旧的代码示例中使用了 <code>_content</code> 而不是 <code>content</code>.该形式的属性名已经被废弃很久了,你应该在新的代码中使用<code>content</code>.</p><h3 id="Syntax"><a href="#Syntax" title="Permalink to 语法">语法</a></h3><pre class="eval notranslate">var <var>windowObject</var> = window.content; </pre><h3 id="Example"><a href="#Example" title="Permalink to 例子">例子</a></h3><p>在一个拥有<code><browser type="content-primary"/>标签的</code>chrome XUL 窗口下运行下面的代码.会在浏览器当前显示的页面上的第一个div标签上添加一个红色的边框:</p> <pre class="eval notranslate">content.document.getElementsByTagName("div")[0].style.border = "solid red 1px"; </pre><h3 id="Specification"><a href="#Specification" title="Permalink to 规范">规范</a></h3><p>不属于W3C规范.</p><h3 id="See_also"><a href="#See_also" title="Permalink to 相关链接">相关链接</a></h3><ul> <li><a href="/wiki/zh-CN/docs/Web/API/Window/zh-CN/Working_with_windows_in_chrome_code">Working with 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