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---
title: CountQueuingStrategy
slug: Web/API/CountQueuingStrategy
tags:
- API
- CountQueuingStrategy
- Experimental
- Interface
- Reference
- Streams
translation_of: Web/API/CountQueuingStrategy
---
<p>{{SeeCompatTable}}{{APIRef("Streams")}}</p>
<p><span class="seoSummary"><a href="/ja/docs/Web/API/Streams_API">Streams API</a> の <strong><code>CountQueuingStrategy</code></strong> インターフェイスは、ストリームの構築時に使用できる組み込みのチャンクカウントキューイング戦略を提供します。</span></p>
<h2 id="Constructor" name="Constructor">コンストラクター</h2>
<dl>
<dt>{{domxref("CountQueuingStrategy.CountQueuingStrategy", "CountQueuingStrategy()")}}</dt>
<dd>新しい <code>CountQueuingStrategy</code> オブジェクトのインスタンスを作成します。</dd>
</dl>
<h2 id="Properties" name="Properties">プロパティ</h2>
<p>なし。</p>
<h2 id="Methods" name="Methods">メソッド</h2>
<dl>
<dt>{{domxref("CountQueuingStrategy.size()")}}</dt>
<dd><code>1</code> を返します。</dd>
</dl>
<h2 id="Examples" name="Examples">例</h2>
<pre class="brush: js line-numbers language-js"><code class="language-js"><span class="keyword token">const</span> queueingStrategy <span class="operator token">=</span> <span class="keyword token">new</span> <span class="class-name token">CountQueuingStrategy</span><span class="punctuation token">(</span><span class="punctuation token">{</span> highWaterMark<span class="punctuation token">:</span> <span class="number token">1</span> <span class="punctuation token">}</span><span class="punctuation token">)</span><span class="punctuation token">;</span>
<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="comment token">// シンクの実装</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="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="function token">abort</span><span class="punctuation token">(</span>err<span class="punctuation token">)</span> <span class="punctuation token">{</span>
console<span class="punctuation token">.</span><span class="function token">log</span><span class="punctuation token">(</span><span class="string token">"Sink error:"</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> queueingStrategy<span class="punctuation token">)</span><span class="punctuation token">;
var size = queueingStrategy.size()</span></code>;
</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','#cqs-class','CountQueuingStrategy')}}</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>
<div>
<p>{{Compat("api.CountQueuingStrategy")}}</p>
</div>
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