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---
title: WebAssembly.Instance
slug: Web/JavaScript/Reference/Global_Objects/WebAssembly/Instance
tags:
  - API
  - Experimental
  - JavaScript
  - Reference
  - WebAssembly
translation_of: Web/JavaScript/Reference/Global_Objects/WebAssembly/Instance
---
<div>{{JSRef}} {{SeeCompatTable}}</div>

<p>  <strong><code>WebAssembly.Instance</code></strong> 对象本身是有状态的,是 <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/Module">WebAssembly.Module</a> 的一个可执行实例。  <code>实例</code>包含所有的 <a href="https://developer.mozilla.org/en-US/docs/WebAssembly/Exported_functions">WebAssembly 导出函数</a> ,允许从JavaScript 调用 WebAssembly 代码。</p>

<p><code>WebAssembly.Instance()</code> 构造函数以同步方式实例化一个{{jsxref("WebAssembly.Module")}} 对象。 然而, 通常获取实例的方法是通过异步函数{{jsxref("WebAssembly.instantiate()")}} .</p>

<h2 id="构造函数">构造函数</h2>

<div class="warning">
<p><strong>重要</strong>: 由于大型模块的实例化代价极高, 开发人员应只在必须同步实例化的时候,才使用<code>Instance()</code>;绝大多数情况应该使用异步方法{{jsxref("WebAssembly.instantiate()")}} .</p>
</div>

<pre class="syntaxbox notranslate">var myInstance = new WebAssembly.Instance(<em>module</em>, <em>importObject</em>);</pre>

<h3 id="参数">参数</h3>

<dl>
 <dt><em>module</em></dt>
 <dd>要被实例化的 <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/Module" title="The Module() constructor of the WebAssembly global object creates a new Module object instance."><code>WebAssembly.Module</code></a> 对象.</dd>
 <dt><em>importObject</em> {{optional_inline}}</dt>
 <dd>一个包含值的对象,导入到新创建的 <code>实例</code>, 比如函数或 <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/Memory" title="The Memory() constructor of the WebAssembly global object creates a new Memory object instance, which represents a WebAssembly memory. These can be thought of as resizeable array buffers, wrappers around WebAssembly memories."><code>WebAssembly.Memory</code></a> 对象. There must be one matching property for each declared import of <code>module</code> 否则抛出 <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/LinkError">WebAssembly.LinkError</a> 异常.</dd>
</dl>

<h2 id="实例化">实例化</h2>

<p>所有的 <code>Instance</code> 实例继承自<code>Instance()</code> <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/Instance/prototype">属性对象</a>— 修改它会影响所有的<code>Instance</code> 实例.</p>

<h3 id="实例属性">实例属性</h3>

<dl>
 <dt>{{jsxref("WebAssembly/Instance/exports", "Instance.prototype.exports")}}</dt>
 <dd>返回一个包含此 WebAssembly 模块实例所导出的全部成员的 JS 对象,以便 JavaScript 访问和使用这些成员,这个对象是只读的。</dd>
 <dt></dt>
</dl>

<div class="hidden">
<dl>
 <dt></dt>
 <dt>
 <p>译者注:英文版的变动有点大,用例模块暂时不翻译,后来者有心的话可以翻译一下。</p>
 </dt>
</dl>
</div>

<h2 id="规格">规格</h2>

<table class="standard-table">
 <thead>
  <tr>
   <th scope="col">规格</th>
   <th scope="col">状态</th>
   <th scope="col">描述</th>
  </tr>
 </thead>
 <tbody>
  <tr>
   <td>{{SpecName('WebAssembly JS', '#webassemblyinstance-objects', 'Instance')}}</td>
   <td>{{Spec2('WebAssembly JS')}}</td>
   <td>Initial draft definition.</td>
  </tr>
 </tbody>
</table>

<h2 id="Browser_compatibility" name="Browser_compatibility">浏览器兼容性</h2>

<div class="hidden">
<p>为了便于维护,此兼容性表格由结构化数据生成。如果您有意向此表格贡献内容,请向 <a href="https://github.com/mdn/browser-compat-data ">这个仓库</a> 提交代码并发送对应的 pull request 给我们。</p>
</div>

<div>{{Compat("javascript.builtins.WebAssembly.Instance")}}</div>

<h2 id="参考">参考</h2>

<ul>
 <li><a href="/en-US/docs/WebAssembly">WebAssembly</a> overview page</li>
 <li><a href="/en-US/docs/WebAssembly/Concepts">WebAssembly concepts</a></li>
 <li><a href="/en-US/docs/WebAssembly/Using_the_JavaScript_API">Using the WebAssembly JavaScript API</a></li>
</ul>