---
title: DataView.prototype.setUint8()
slug: Web/JavaScript/Reference/Global_Objects/DataView/setUint8
translation_of: Web/JavaScript/Reference/Global_Objects/DataView/setUint8
---
<div>{{JSRef}}</div>

<p><strong><code>setUint8()</code></strong><code>从</code><a href="https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/DataView" title="DataView 视图提供了一种用于向 ArrayBuffer 读写数据的底层接口。"><code>DataView</code></a>起始位置以byte为计数的指定偏移量(byteOffset)处储存一个8-bit数(无符号字节).</p>

<div>{{EmbedInteractiveExample("pages/js/dataview-setuint8.html")}}</div>



<h2 id="语法">语法</h2>

<pre class="syntaxbox"><var>dataview</var>.setUint8(byteOffset, value)</pre>

<h3 id="参数">参数</h3>

<dl>
 <dt>byteOffset</dt>
 <dd>偏移量，从头开始计算，单位为字节</dd>
 <dt>value</dt>
 <dd>设置的数值</dd>
</dl>

<h3 id="返回">返回</h3>

<p>{{jsxref("undefined")}}.</p>

<h3 id="抛出错误">抛出错误</h3>

<dl>
 <dt>{{jsxref("RangeError")}}</dt>
 <dd>如果byteOffset超出了视图能储存的值，就会抛出错误.</dd>
</dl>

<h2 id="例子">例子</h2>

<pre class="brush:js">var buffer = new ArrayBuffer(8);
var dataview = new DataView(buffer);
dataview.setUint8(1, 3);
dataview.getUint8(1); // 3
</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('Typed Array')}}</td>
   <td>{{Spec2('Typed Array')}}</td>
   <td>Superseded by ECMAScript 6.</td>
  </tr>
  <tr>
   <td>{{SpecName('ES6', '#sec-dataview.prototype.setuint8', 'DataView.prototype.setUint8')}}</td>
   <td>{{Spec2('ES6')}}</td>
   <td>Initial definition in an ECMA standard.</td>
  </tr>
  <tr>
   <td>{{SpecName('ESDraft', '#sec-dataview.prototype.setuint8', 'DataView.prototype.setUint8')}}</td>
   <td>{{Spec2('ESDraft')}}</td>
   <td> </td>
  </tr>
 </tbody>
</table>

<h2 id="浏览器支持">浏览器支持</h2>



<p>{{Compat("javascript.builtins.DataView.setUint8")}}</p>

<h2 id="相关内容">相关内容</h2>

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