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+---
+title: ByteLengthQueuingStrategy.size()
+slug: Web/API/ByteLengthQueuingStrategy/size
+tags:
+  - API
+  - ByteLengthQueuingStrategy
+  - Experimental
+  - Method
+  - Reference
+  - Streams
+  - size
+translation_of: Web/API/ByteLengthQueuingStrategy/size
+---
+<div>{{draft}}{{SeeCompatTable}}{{APIRef("Streams")}}</div>
+
+<p class="summary"><span class="seoSummary">{{domxref("ByteLengthQueuingStrategy")}} インターフェイスの <strong><code>size()</code></strong> メソッドは、所与のチャンクの <code>byteLength</code> プロパティを返します。</span></p>
+
+<h2 id="Syntax" name="Syntax">構文</h2>
+
+<pre class="syntaxbox"><var><code>var <em>size</em> = </code>byteLengthQueuingStrategy</var>.size(<em>chunk</em>);</pre>
+
+<h3 id="Parameters" name="Parameters">パラメーター</h3>
+
+<dl>
+ <dt>chunk</dt>
+ <dd>ストリームを通過するデータのチャンク。</dd>
+</dl>
+
+<h3 id="Return_value" name="Return_value">戻り値</h3>
+
+<p>所与のチャンクのバイト長を表す整数。</p>
+
+<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> queuingStrategy <span class="operator token">=</span> <span class="keyword token">new</span> <span class="class-name token">ByteLengthQueuingStrategy</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> readableStream <span class="operator token">=</span> <span class="keyword token">new</span> <span class="class-name token">ReadableStream</span><span class="punctuation token">(</span><span class="punctuation token">{</span>
+  <span class="function token">start</span><span class="punctuation token">(</span>controller<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">pull</span><span class="punctuation token">(</span>controller<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">cancel</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">"stream 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> queuingStrategy<span class="punctuation token">)</span><span class="punctuation token">;</span>
+
+<span class="keyword token">var</span> size <span class="operator token">=</span> queueingStrategy<span class="punctuation token">.</span><span class="function token">size</span><span class="punctuation token">(</span>chunk<span class="punctuation token">)</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","#blqs-size","size")}}</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.ByteLengthQueuingStrategy.size")}}</p>