From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:40:17 -0500
Subject: initial commit

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+---
+title: ServiceWorkerRegistration.update()
+slug: Web/API/ServiceWorkerRegistration/update
+tags:
+  - 方法
+  - 更新
+translation_of: Web/API/ServiceWorkerRegistration/update
+---
+<div>{{APIRef("Service Workers API")}}</div>
+
+<div>{{domxref("ServiceWorkerRegistration")}} 的<code><strong>update</strong></code>方法尝试更新service worker。获得worker脚本的URL，逐字节匹配新获取的worker和当前的worker，存在差异的时候安装新的worker。获取worker脚本的更新操作会忽略浏览器缓存的24小时前的内容。</div>
+
+<div class="note">
+<p><strong>注意</strong>: 这个特性也应用于 <a href="/en-US/docs/Web/API/Web_Workers_API">Web Workers</a>.</p>
+</div>
+
+<h2 id="Syntax" name="Syntax" style="line-height: 30px; font-size: 2.14285714285714rem;">语法</h2>
+
+<pre>ServiceWorkerRegistration.update();</pre>
+
+<h3 id="参数">参数</h3>
+
+<p>None.</p>
+
+<h3 id="返回">返回</h3>
+
+<p>返回 {{domxref("Promise")}} 在resolve时对应一个 {{domxref("ServiceWorkerRegistration")}} 对象。</p>
+
+<h2 id="示例">示例</h2>
+
+<p>下面的示例注册一个service worker，然后绑定事件到按钮，这样你可以有需要时，明确的更新server worker：</p>
+
+<pre class="brush: js">if ('serviceWorker' in navigator) {
+  navigator.serviceWorker.register('/sw-test/sw.js', {scope: 'sw-test'}).then(function(registration) {
+    // registration worked
+    console.log('Registration succeeded.');
+    button.onclick = function() {
+      registration.update();
+    }
+  }).catch(function(error) {
+    // registration failed
+    console.log('Registration failed with ' + error);
+  });
+};</pre>
+
+<h2 id="标准">标准</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('Service Workers', '#service-worker-registration-update-method', 'ServiceWorkerRegistration.update()')}}</td>
+   <td>{{Spec2('Service Workers')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+
+
+<p>{{Compat("api.ServiceWorkerRegistration.update")}}</p>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web/API/ServiceWorker_API/Using_Service_Workers">Using Service Workers</a></li>
+ <li><a href="https://github.com/mdn/sw-test">Service workers basic code example</a></li>
+ <li><a href="https://jakearchibald.github.io/isserviceworkerready/">Is ServiceWorker ready?</a></li>
+ <li>{{jsxref("Promise")}}</li>
+ <li><a href="/en-US/docs/Web/Guide/Performance/Using_web_workers">Using web workers</a></li>
+</ul>
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