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+---
+title: getBigInt64()
+slug: Web/JavaScript/Reference/Global_Objects/DataView/getBigInt64
+tags:
+  - DataView
+  - JavaScript
+  - Prototype
+  - getBigInt64()
+  - 大整型
+translation_of: Web/JavaScript/Reference/Global_Objects/DataView/getBigInt64
+---
+<div>{{JSRef}}</div>
+
+<div></div>
+
+<p><strong><code>getBigInt64()</code></strong> 方法从 {{jsxref("DataView")}}开始获取一个指定偏移量的有符号64位整数 (long long) 。</p>
+
+<div>{{EmbedInteractiveExample("pages/js/dataview-getbigint64.html")}}</div>
+
+
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><var>dataview</var>.getBigInt64(byteOffset [, littleEndian])</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt>byteOffset</dt>
+ <dd>偏移量，以字节为单位。指明视图开始读取数据的偏移量。</dd>
+ <dt>littleEndian</dt>
+ <dd>{{optional_inline}} 指明该64位整型数值的存储方式（ {{Glossary("Endianness", "大小端模式")}}） 。 如果为 <code>false</code> 或 <code>undefined</code>, 则按大端方式读取数据。</dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p>一个 {{jsxref("BigInt")}}.</p>
+
+<h3 id="异常抛出">异常抛出</h3>
+
+<dl>
+ <dt>{{jsxref("RangeError")}}</dt>
+ <dd>如果 <code>byteOffset</code> 设置的偏移量超出了视图的范围，则抛出该异常。</dd>
+</dl>
+
+<h2 id="简介">简介</h2>
+
+<ul>
+ <li>没有对齐约束;</li>
+ <li>可以从任何偏移量获取多字节值。</li>
+</ul>
+
+<h2 id="例子">例子</h2>
+
+<h3 id="使用_getBigInt64_方法">使用 <code>getBigInt64</code> 方法</h3>
+
+<pre class="brush:js">var buffer = new ArrayBuffer(8);
+var dataview = new DataView(buffer);
+dataview.getBigInt64(0); // 0n
+</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">规范版本</th>
+   <th scope="col">规范状态</th>
+   <th scope="col">注解      </th>
+  </tr>
+  <tr>
+   <td><a href="https://tc39.github.io/proposal-bigint/#sec-dataview.prototype.getbigint64">DataView.prototype.getBigInt64 proposal</a></td>
+   <td></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.getBigInt64")}}</p>
+
+<h2 id="另请参阅">另请参阅</h2>
+
+<ul>
+ <li>{{jsxref("DataView")}}</li>
+ <li>{{jsxref("ArrayBuffer")}}</li>
+ <li>{{jsxref("BigInt")}}</li>
+</ul>