---
title: WritableStreamDefaultWriter.releaseLock()
slug: Web/API/WritableStreamDefaultWriter/releaseLock
tags:
  - API
  - Experimental
  - Method
  - Reference
  - Streams
  - WritiableStream
  - releaseLock
translation_of: Web/API/WritableStreamDefaultWriter/releaseLock
---
<p>{{APIRef("Streams")}}{{SeeCompatTable}}{{draft}}</p>

<p>{{domxref("WritableStreamDefaultWriter")}} インターフェイスの <span class="seoSummary"><strong><code>releaseLock()</code></strong> メソッドは、対応するストリームのライターのロックを解除します。 ロックを解除すると、ライターはアクティブではなくなります。 ロックを解除したときに関連するストリームにエラーが発生した場合、ライターはこれ以降同じようにエラーが発生したように見えます。 そうでない場合、ライターは閉じられたように見えます。</span></p>

<h2 id="構文">構文</h2>

<pre class="syntaxbox"><em>writableStreamDefaultWritere</em>.releaseLock()</pre>

<h3 id="パラメーター">パラメーター</h3>

<p>なし。</p>

<h3 id="戻り値">戻り値</h3>

<p><code>undefined</code>。</p>

<h2 id="例">例</h2>

<pre class="brush: js line-numbers  language-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">.

const writer = writableStream.getWriter();

...</span>

<span class="comment token">// 必要に応じて、ストリームのライターのロックを解除します</span>
writer<span class="punctuation token">.</span><span class="punctuation token">releaseLock();</span></code></pre>

<h2 id="仕様">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','#default-reader-release-lock','releaseLock()')}}</td>
   <td>{{Spec2('Streams')}}</td>
   <td>初期定義</td>
  </tr>
 </tbody>
</table>

<h2 id="ブラウザーの互換性">ブラウザーの互換性</h2>



<p>{{Compat("api.WritableStreamDefaultWriter.releaseLock")}}</p>