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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>警告:</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">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>
</dl>
<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="浏览器兼容性">浏览器兼容性</h2>
{{Compat}}
<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>
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