---
title: WritableStream.locked
slug: Web/API/WritableStream/locked
tags:
  - API
  - Experimental
  - Property
  - Reference
  - Streams
  - WritableStream
  - locked
translation_of: Web/API/WritableStream/locked
---
<div>{{draft}}{{SeeCompatTable}}{{APIRef("Streams")}}</div>

<p class="summary"><span class="seoSummary">{{domxref("WritableStream")}} インターフェイスの <strong><code>locked</code></strong> 読み取り専用プロパティは、<code>WritableStream</code> がライターにロックされているかどうかを示すブール値を返します。</span></p>

<h2 id="Syntax" name="Syntax">構文</h2>

<pre class="syntaxbox"><var><code>var <em>locked</em> = </code>writableStream</var>.locked;</pre>

<h3 id="Value" name="Value">値</h3>

<p>書き込み可能なストリームがロックされているかどうかを示す {{jsxref("Boolean")}}。</p>

<h2 id="Examples" name="Examples">例</h2>

<pre class="brush: js"><code class="language-js"><span class="keyword token">const</span> writableStream <span class="operator token">=</span> <span class="keyword token">new</span> <span class="class-name token">WritableStream</span><span class="punctuation token">(</span><span class="punctuation token">{</span>
  <span class="function token">write</span><span class="punctuation token">(</span>chunk<span class="punctuation token">)</span> <span class="punctuation token">{</span>
    <span class="punctuation token">.</span><span class="punctuation token">.</span><span class="punctuation token">.</span>
  <span class="punctuation token">}</span><span class="punctuation token">,</span>
  <span class="function token">close</span><span class="punctuation token">(</span><span class="punctuation token">)</span> <span class="punctuation token">{</span>
    <span class="punctuation token">.</span><span class="punctuation token">.</span><span class="punctuation token">.</span>
  <span class="punctuation token">}</span><span class="punctuation token">,</span>
  <span class="function token">abort</span><span class="punctuation token">(</span>err<span class="punctuation token">)</span> <span class="punctuation token">{</span>
    <span class="punctuation token">.</span><span class="punctuation token">.</span><span class="punctuation token">.</span>
  <span class="punctuation token">}</span>
<span class="punctuation token">}</span><span class="punctuation token">,</span> queuingStrategy<span class="punctuation token">)</span><span class="punctuation token">;</span>

<span class="punctuation token">.</span><span class="punctuation token">.</span><span class="punctuation token">.</span></code>

const writer = writableStream.getWriter();

writableStream.locked
// ストリームがライターにロックされているため、true を返すべきです</pre>

<h2 id="Specifications" name="Specifications">仕様</h2>

<table class="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("Streams","#ws-locked","locked")}}</td>
   <td>{{Spec2('Streams')}}</td>
   <td>初期定義</td>
  </tr>
 </tbody>
</table>

<h2 id="Browser_compatibility" name="Browser_compatibility">ブラウザーの互換性</h2>

<p>{{Compat("api.WritableStream.locked")}}</p>