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+---
+title: DataView.prototype.byteLength
+slug: Web/JavaScript/Reference/Global_Objects/DataView/byteLength
+translation_of: Web/JavaScript/Reference/Global_Objects/DataView/byteLength
+---
+<div>{{JSRef}}</div>
+
+<p> <strong><code>byteLength</code></strong> 属性描述了视图从它的 {{jsxref("ArrayBuffer")}} 开始的字节长度。</p>
+
+<div>{{EmbedInteractiveExample("pages/js/dataview-bytelength.html")}}</div>
+
+
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><var>dataview</var>.byteLength</pre>
+
+<h2 id="描述">描述</h2>
+
+<p><code>byteLength</code> 属性是一个获取(accessor)属性，它的 set 属性为 undefined，这意味着它是只读的。值在 <code>DataView 被创建时就确定了，且不能改变。如果</code> <code>DataView</code> 没有指定偏移量或byteLength，那么被引用的 <code>ArrayBuffer 的字节长度将被返回。</code></p>
+
+<h2 id="Examples">Examples</h2>
+
+<h3 id="Using_the_byteLength_property">Using the <code>byteLength</code> property</h3>
+
+<pre class="brush:js">var buffer = new ArrayBuffer(8);
+var dataview = new DataView(buffer);
+dataview.byteLength; // 8 (matches the byteLength of the buffer)
+
+var dataview2 = new DataView(buffer, 1, 5);
+dataview2.byteLength; // 5 (as specified when constructing the DataView)
+
+var dataview3 = new DataView(buffer, 2);
+dataview3.byteLength; // 6 (due to the offset of the constructed DataView)
+</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-get-dataview.prototype.bytelength', 'DataView.prototype.byteLength')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-get-dataview.prototype.bytelength', 'DataView.prototype.byteLength')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+
+
+<p>{{Compat("javascript.builtins.DataView.byteLength")}}</p>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("DataView")}}</li>
+ <li>{{jsxref("ArrayBuffer")}}</li>
+</ul>