---
title: DataView.prototype.getBigUint64()
slug: Web/JavaScript/Reference/Global_Objects/DataView/getBigUint64
translation_of: Web/JavaScript/Reference/Global_Objects/DataView/getBigUint64
---
<div>{{JSRef}}</div>

<p><strong><code>getBigUint64()</code></strong>方法，从{{jsxref("DataView")}}的指定偏移量位置获取一个无符号64位整数(unsigned long long)。</p>

<div>{{EmbedInteractiveExample("pages/js/dataview-getbiguint64.html")}}</div>

<h2 id="语法">语法</h2>

<pre class="syntaxbox"><var>dataview</var>.getBigUint64(byteOffset [, littleEndian])</pre>

<h3 id="参数">参数</h3>

<dl>
 <dt>byteOffset</dt>
 <dd>偏移量，按<strong>字节</strong>偏移，从DataView读取一个整数</dd>
 <dt>littleEndian</dt>
 <dd>{{optional_inline}} 指出64位整数以 {{Glossary("Endianness", "little- or big-endian")}} 类型存储. 如果值为 <code>false</code> or <code>undefined</code>, 读取一个大端数值.</dd>
</dl>

<h3 id="返回值">返回值</h3>

<p>A {{jsxref("BigInt")}}.</p>

<h3 id="异常">异常</h3>

<dl>
 <dt>{{jsxref("RangeError")}}</dt>
 <dd>Thrown if the <code>byteOffset</code> is set such that it would read beyond the end of the view.</dd>
</dl>

<h2 id="Description">Description</h2>

<p>There is no alignment constraint; multi-byte values may be fetched from any offset.</p>

<h2 id="Examples">Examples</h2>

<h3 id="Using_the_getBigUint64_method">Using the <code>getBigUint64</code> method</h3>

<pre class="brush:js">var buffer = new ArrayBuffer(8);
var dataview = new DataView(buffer);
dataview.getBigUint64(0); // 0n
</pre>

<h2 id="Specifications">Specifications</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><a href="https://tc39.es/proposal-bigint/#sec-dataview.prototype.getbiguint64">DataView.prototype.getBigUint64 proposal</a></td>
   <td></td>
   <td></td>
  </tr>
 </tbody>
</table>

<h2 id="Browser_compatibility">Browser compatibility</h2>



<p>{{Compat("javascript.builtins.DataView.getBigUint64")}}</p>

<h2 id="See_also">See also</h2>

<ul>
 <li>{{jsxref("DataView")}}</li>
 <li>{{jsxref("ArrayBuffer")}}</li>
 <li>{{jsxref("BigInt")}}</li>
</ul>