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107 lines
11 KiB
HTML
<article id="wikiArticle">
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<div></div>
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<p><strong><code>WebAssembly.compileStreaming()</code></strong> 方法用来从一个流式源中直接编译一个 <a href="Reference/Global_Objects/WebAssembly/Module" title="所有 Module 实例继承自 Module() 构造函数的原型对象 —— 修改它会影响所有 Module 实例。"><code>WebAssembly.Module</code></a>。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 <a href="Reference/Global_Objects/WebAssembly/instantiateStreaming" title="WebAssembly.instantiateStreaming() 方法直接从流式底层源编译和实例化WebAssembly模块。这是加载wasm代码一种非常有效的优化方式。"><code>WebAssembly.instantiateStreaming()</code></a> 方法。</p>
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<h2 id="语法">语法</h2>
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<pre><code class="language-javascript">Promise<WebAssembly.Module> WebAssembly.compileStreaming(<em>source</em>);</code></pre>
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<h3 id="参数">参数</h3>
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<dl>
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<dt><em>source</em></dt>
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<dd>一个 <a href="/zh-CN/docs/Web/API/Response" title="Fetch API 的Response接口呈现了对一次请求的响应数据"><code>Response</code></a> 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>
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</dl>
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<h3 id="返回值">返回值</h3>
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<p>一个会被解决（resolve）为编译后的 <a href="Reference/Global_Objects/WebAssembly/Module" title="所有 Module 实例继承自 Module() 构造函数的原型对象 —— 修改它会影响所有 Module 实例。"><code>WebAssembly.Module</code></a> 对象的 <code>Promise</code>。</p>
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<h3 id="异常">异常</h3>
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<ul>
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<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 <a href="Reference/Global_Objects/TypeError" title="TypeError（类型错误） 对象用来表示值的类型非预期类型时发生的错误。"><code>TypeError</code></a> 异常。</li>
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<li>如果编译失败，promise 会通过拒绝（reject）来返回一个 <a class="new" href="Reference/Global_Objects/WebAssembly/CompileError" rel="nofollow" title="此页面仍未被本地化, 期待您的翻译!"><code>WebAssembly.CompileError</code></a>。</li>
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</ul>
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<h2 id="例子">例子</h2>
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<p>下面的例子（在 GitHub 上查看我们的 <a class="external" href="https://github.com/mdn/webassembly-examples/blob/master/js-api-examples/compile-streaming.html" rel="noopener">compile-streaming.html</a> 示例或者直接<a class="external" href="https://mdn.github.io/webassembly-examples/js-api-examples/compile-streaming.html" rel="noopener">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 <a href="Reference/Global_Objects/WebAssembly/Module" title="所有 Module 实例继承自 Module() 构造函数的原型对象 —— 修改它会影响所有 Module 实例。"><code>WebAssembly.Module</code></a> 对象。因为 <code>compileStreaming()</code> 方法可以接受一个结果为 <a href="/zh-CN/docs/Web/API/Response" title="Fetch API 的Response接口呈现了对一次请求的响应数据"><code>Response</code></a> 对象的 promise，因此你可以直接用 <a href="/zh-CN/docs/Web/API/WindowOrWorkerGlobalScope/fetch" title="位于 WorkerOrGlobalScope 这一个 mixin 中的 fetch() 方法用于发起获取资源的请求。它返回一个 promise，这个 promise 会在请求响应后被 resolve，并传回 Response 对象。"><code>WindowOrWorkerGlobalScope.fetch()</code></a> 的调用结果来调用该方法。</p>
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<pre><code class="language-javascript">var importObject = { imports: { imported_func: arg => console.log(arg) } };
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WebAssembly.compileStreaming(fetch('simple.wasm'))
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.then(module => WebAssembly.instantiate(module, importObject))
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.then(instance => instance.exports.exported_func());</code></pre>
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<p>得到的 module 实例接下来通过 <a href="Reference/Global_Objects/WebAssembly/instantiate" title="WebAssembly.instantiate() 是编译和实例化 WebAssembly 代码的主要方法. 这个方法有两个重载方式:"><code>WebAssembly.instantiate()</code></a> 方法被实例化了，然后调用模块导出的函数。</p>
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<h2 id="Specifications">Specifications</h2>
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<table class="standard-table">
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<thead>
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<tr>
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<th scope="col">Specification</th>
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<th scope="col">Status</th>
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<th scope="col">Comment</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td><a class="external" href="https://github.com/WebAssembly/design/blob/master/Web.md#webassemblycompilestreaming" hreflang="en" lang="en" rel="noopener">WebAssembly features for web embedding<br/><small lang="zh-CN">compileStreaming()</small></a></td>
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<td><span class="spec-Draft">Draft</span></td>
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<td>Initial draft definition.</td>
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</tr>
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</tbody>
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</table>
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<h2 id="Browser_compatibility" name="Browser_compatibility">Browser compatibility</h2>
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<div>
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<div class="hidden">The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out <a class="external" href="https://github.com/mdn/browser-compat-data" rel="noopener">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</div>
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<p></p><div class="bc-data"><a class="bc-github-link external" href="https://github.com/mdn/browser-compat-data" rel="noopener">Update compatibility data on GitHub</a><table class="bc-table bc-table-js"><thead><tr class="bc-platforms"><td></td><th class="bc-platform-desktop" colspan="6"><span>Desktop</span></th><th class="bc-platform-mobile" colspan="7"><span>Mobile</span></th><th class="bc-platform-server" colspan="1"><span>Server</span></th></tr><tr class="bc-browsers"><td></td><th class="bc-browser-chrome"><span class="bc-head-txt-label bc-head-icon-chrome">Chrome</span></th><th class="bc-browser-edge"><span class="bc-head-txt-label bc-head-icon-edge">Edge</span></th><th class="bc-browser-firefox"><span class="bc-head-txt-label bc-head-icon-firefox">Firefox</span></th><th class="bc-browser-ie"><span class="bc-head-txt-label bc-head-icon-ie">Internet Explorer</span></th><th class="bc-browser-opera"><span class="bc-head-txt-label bc-head-icon-opera">Opera</span></th><th class="bc-browser-safari"><span class="bc-head-txt-label bc-head-icon-safari">Safari</span></th><th class="bc-browser-webview_android"><span class="bc-head-txt-label bc-head-icon-webview_android">Android webview</span></th><th class="bc-browser-chrome_android"><span class="bc-head-txt-label bc-head-icon-chrome_android">Chrome for Android</span></th><th class="bc-browser-edge_mobile"><span class="bc-head-txt-label bc-head-icon-edge_mobile">Edge Mobile</span></th><th class="bc-browser-firefox_android"><span class="bc-head-txt-label bc-head-icon-firefox_android">Firefox for Android</span></th><th class="bc-browser-opera_android"><span class="bc-head-txt-label bc-head-icon-opera_android">Opera for Android</span></th><th class="bc-browser-safari_ios"><span class="bc-head-txt-label bc-head-icon-safari_ios">Safari on iOS</span></th><th class="bc-browser-samsunginternet_android"><span class="bc-head-txt-label bc-head-icon-samsunginternet_android">Samsung Internet</span></th><th class="bc-browser-nodejs"><span class="bc-head-txt-label bc-head-icon-nodejs">Node.js</span></th></tr></thead><tbody><tr><th scope="row"><code>compileStreaming</code></th><td class="bc-supports-yes bc-browser-chrome"><span class="bc-browser-name">Chrome</span><abbr class="bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr>
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61</td><td class="bc-supports-yes bc-browser-edge"><span class="bc-browser-name">Edge</span><abbr class="bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr>
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16</td><td class="bc-supports-yes bc-browser-firefox"><span class="bc-browser-name">Firefox</span><abbr class="bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr>
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58</td><td class="bc-supports-no bc-browser-ie"><span class="bc-browser-name">IE</span><abbr class="bc-level-no only-icon" title="No support">
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<span>No support</span>
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</abbr>
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No</td><td class="bc-supports-yes bc-browser-opera"><span class="bc-browser-name">Opera</span><abbr class="bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr>
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47</td><td class="bc-supports-no bc-browser-safari"><span class="bc-browser-name">Safari</span><abbr class="bc-level-no only-icon" title="No support">
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<span>No support</span>
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</abbr>
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No</td><td class="bc-supports-yes bc-browser-webview_android"><span class="bc-browser-name">WebView Android</span><abbr class="bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr>
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61</td><td class="bc-supports-yes bc-browser-chrome_android"><span class="bc-browser-name">Chrome Android</span><abbr class="bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr>
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61</td><td class="bc-supports-no bc-browser-edge_mobile"><span class="bc-browser-name">Edge Mobile</span><abbr class="bc-level-no only-icon" title="No support">
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<span>No support</span>
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</abbr>
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No</td><td class="bc-supports-yes bc-browser-firefox_android"><span class="bc-browser-name">Firefox Android</span><abbr class="bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr>
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58</td><td class="bc-supports-unknown bc-browser-opera_android"><span class="bc-browser-name">Opera Android</span><abbr title="Compatibility unknown; please update this.">
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?
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</abbr></td><td class="bc-supports-no bc-browser-safari_ios"><span class="bc-browser-name">Safari iOS</span><abbr class="bc-level-no only-icon" title="No support">
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<span>No support</span>
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</abbr>
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No</td><td class="bc-supports-no bc-browser-samsunginternet_android"><span class="bc-browser-name">Samsung Internet Android</span><abbr class="bc-level-no only-icon" title="No support">
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<span>No support</span>
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</abbr>
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No</td><td class="bc-supports-no bc-browser-nodejs"><span class="bc-browser-name">nodejs</span><abbr class="bc-level-no only-icon" title="No support">
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<span>No support</span>
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</abbr>
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No</td></tr></tbody></table><section class="bc-legend" id="sect1"><h3 class="offscreen" id="Legend">Legend</h3><dl><dt><span class="bc-supports-yes bc-supports">
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<abbr class="bc-level bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr></span></dt><dd>Full support</dd><dt><span class="bc-supports-no bc-supports">
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<abbr class="bc-level bc-level-no only-icon" title="No support">
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<span>No support</span>
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</abbr></span></dt><dd>No support</dd><dt><span class="bc-supports-unknown bc-supports">
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<abbr class="bc-level bc-level-unknown only-icon" title="Compatibility unknown">
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<span>Compatibility unknown</span>
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</abbr></span></dt><dd>Compatibility unknown</dd></dl></section></div><p></p>
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</div>
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<h2 id="See_also">See also</h2>
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<ul>
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<li><a href="/en-US/docs/WebAssembly">WebAssembly</a> overview page</li>
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<li><a href="/en-US/docs/WebAssembly/Concepts">WebAssembly concepts</a></li>
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<li><a href="/en-US/docs/WebAssembly/Using_the_JavaScript_API">Using the WebAssembly JavaScript API</a></li>
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</ul>
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</article> |