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---
title: DataView.prototype.setInt8()
slug: Web/JavaScript/Reference/Global_Objects/DataView/setInt8
translation_of: Web/JavaScript/Reference/Global_Objects/DataView/setInt8
---
<div>{{JSRef}}</div>
<p><strong><code>setInt8()</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(一个字节).</p>
<div>{{EmbedInteractiveExample("pages/js/dataview-setint8.html")}}</div>
<h2 id="语法">语法</h2>
<pre class="syntaxbox"><var>dataview</var>.setInt8(byteOffset, value)</pre>
<h2 id="参数">参数</h2>
<dl>
<dt>byteOffset</dt>
<dd>偏移量，从头开始计算，单位为字节</dd>
<dt>value</dt>
<dd>设置的整数值</dd>
</dl>
<h3 id="返回">返回</h3>
<p>{{jsxref("undefined")}}.</p>
<h3 id="抛出的错误">抛出的错误</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.setInt8(1, 3);
dataview.getInt8(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Superseded by ECMAScript 6.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.setint8', 'DataView.prototype.setInt8')}}</td>
<td>{{Spec2('ES6')}}</td>
<td>Initial definition in an ECMA standard.</td>
</tr>
</tbody>
</table>
<h2 id="浏览器兼容性">浏览器兼容性</h2>
<p>{{Compat("javascript.builtins.DataView.setInt8")}}</p>
<h2 id="相关内容">相关内容</h2>
<ul>
<li>{{jsxref("DataView")}}</li>
<li>{{jsxref("ArrayBuffer")}}</li>
</ul>
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