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+---
+title: window.length
+slug: Web/API/Window/length
+tags:
+  - API
+  - Gecko
+  - HTML DOM
+  - Property
+  - Reference
+  - Window
+translation_of: Web/API/Window/length
+---
+<div>{{ApiRef}}</div>
+
+<h2 id="概要">概要</h2>
+
+<p>ウィンドウにおけるフレーム（{{HTMLElement("frame")}} か {{HTMLElement("iframe")}} 要素のいずれか）の数を返します。</p>
+
+<h2 id="構文">構文</h2>
+
+<pre class="syntaxbox"><var>framesCount</var> = window.length;
+</pre>
+
+<ul>
+ <li><code>framesCount</code> はフレームの数です。</li>
+</ul>
+
+<h2 id="Example" name="Example">例</h2>
+
+<pre class="brush:js">if (window.length) {
+  // サブフレーム数が 0 でない場合の処理をここに記述
+}</pre>
+
+<h2 id="仕様">仕様</h2>
+
+<table class="spectable standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">仕様</th>
+   <th scope="col">状態</th>
+   <th scope="col">コメント</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('HTML WHATWG','browsers.html#dom-length','Window.length')}}</td>
+   <td>{{Spec2('HTML WHATWG')}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{SpecName('HTML5 W3C', 'browsers.html#dom-length', 'Window.length')}}</td>
+   <td>{{Spec2('HTML5 W3C')}}</td>
+   <td></td>
+  </tr>
+ </tbody>
+</table>