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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>