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---
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>
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