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+---
+title: Window.closed
+slug: Web/API/Window/closed
+translation_of: Web/API/Window/closed
+---
+<div>{{APIRef}}</div>
+
+<h2 id="概述">概述</h2>
+
+<p>此只读属性表示所引用的窗口是否关闭。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><var>isClosed</var> = <var>windowRef</var>.closed;
+</pre>
+
+<dl>
+ <dt><code>isClosed</code></dt>
+ <dd>一个布尔值。 可能的值：
+ <ul>
+  <li><code>true</code>: 窗口已被关闭。</li>
+  <li><code>false</code>: 窗口是打开的。</li>
+ </ul>
+ </dd>
+</dl>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="更改一个弹出窗口的URL">更改一个弹出窗口的URL</h3>
+
+<p>下面的示例演示怎样更改一个已打开的弹出窗口的URL。尝试更改URL之前，它使用window.opener属性来检查有窗口被打开，并且该窗口没有关闭：</p>
+
+<pre class="brush:js">// Check that an opener exists and is not closed
+if (window.opener &amp;&amp; !window.opener.closed) {
+  window.opener.location.href = "http://www.mozilla.org";
+}</pre>
+
+<p>请注意，弹出窗口只能访问打开他们的窗口。</p>
+
+<h3 id="刷新先前打开的弹出窗口">刷新先前打开的弹出窗口</h3>
+
+<p>在这个例子中，函数refreshPopupWindow()调用重载方法的弹出的位置要刷新其数据的对象。如果弹出窗口尚未打开，或者用户已关闭它打开一个新窗口。</p>
+
+<pre class="brush:js">var popupWindow = null;
+
+function refreshPopupWindow() {
+  if (popupWindow &amp;&amp; !popupWindow.closed) {
+    // popupWindow is open, refresh it
+    popupWindow.location.reload(true);
+  } else {
+    // Open a new popup window
+    popupWindow = window.open("popup.html","dataWindow");
+  }
+}
+</pre>
+
+<h2 id="技术说明">技术说明</h2>
+
+<p>HTML5</p>