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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
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+---
+title: WebAssembly.compileStreaming()
+slug: Web/JavaScript/Reference/Global_Objects/WebAssembly/compileStreaming
+translation_of: Web/JavaScript/Reference/Global_Objects/WebAssembly/compileStreaming
+---
+<div>{{JSRef}}</div>
+
+<p><strong><code>WebAssembly.compileStreaming()</code></strong> 方法用来从一个流式源中直接编译一个 {{jsxref("WebAssembly.Module")}}。当模块需要在被实例化前被编译时,这个方法会很有用。如果要从流式源实例化一个模块应采用 {{jsxref("WebAssembly.instantiateStreaming()")}} 方法。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">Promise&lt;WebAssembly.Module&gt; WebAssembly.compileStreaming(<em>source</em>);</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt><em>source</em></dt>
+ <dd>一个 {{domxref("Response")}} 对象或一个会履行(fulfill)它的 promise,用来表示你想编译的 .wasm 模块的流式源。</dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p>一个会被解决(resolve)为编译后的 {{jsxref("WebAssembly.Module")}} 对象的 <code>Promise</code>。</p>
+
+<h3 id="异常">异常</h3>
+
+<ul>
+ <li>如果 <code>bufferSource</code> 不是一个 <a href="/en-US/docs/Web/JavaScript/Typed_arrays">typed array</a>,将会抛出 {{jsxref("TypeError")}} 异常。</li>
+ <li>如果编译失败,promise 会通过拒绝(reject)来返回一个 {{jsxref("WebAssembly.CompileError")}}。</li>
+</ul>
+
+<h2 id="例子">例子</h2>
+
+<p>下面的例子(在 GitHub 上查看我们的 <a href="https://github.com/mdn/webassembly-examples/blob/master/js-api-examples/compile-streaming.html">compile-streaming.html</a> 示例或者直接<a href="https://mdn.github.io/webassembly-examples/js-api-examples/compile-streaming.html">在线预览</a>)直接从流式源传输一个 .wasm 模块然后将其编译为一个 {{jsxref("WebAssembly.Module")}} 对象。因为 <code>compileStreaming()</code> 方法可以接受一个结果为  {{domxref("Response")}} 对象的 promise,因此你可以直接用 {{domxref("WindowOrWorkerGlobalScope.fetch()")}} 的调用结果来调用该方法。</p>
+
+<pre class="brush: js">var importObject = { imports: { imported_func: arg =&gt; console.log(arg) } };
+
+WebAssembly.compileStreaming(fetch('simple.wasm'))
+.then(module =&gt; WebAssembly.instantiate(module, importObject))
+.then(instance =&gt; instance.exports.exported_func());</pre>
+
+<p>得到的 module 实例接下来通过 {{jsxref("WebAssembly.instantiate()")}} 方法被实例化了,然后调用模块导出的函数。</p>
+
+<h2 id="Specifications">Specifications</h2>
+
+<table class="standard-table">
+ <thead>
+ <tr>
+ <th scope="col">Specification</th>
+ <th scope="col">Status</th>
+ <th scope="col">Comment</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr>
+ <td>{{SpecName('WebAssembly Embedding', '#webassemblycompilestreaming', 'compileStreaming()')}}</td>
+ <td>{{Spec2('WebAssembly Embedding')}}</td>
+ <td>Initial draft definition.</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility" name="Browser_compatibility">Browser compatibility</h2>
+
+<div>
+
+
+<p>{{Compat("javascript.builtins.WebAssembly.compileStreaming")}}</p>
+</div>
+
+<h2 id="See_also">See also</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>