initial commit

1 files changed, 123 insertions, 0 deletions

diff --git a/files/zh-cn/web/api/serviceworker/onstatechange/index.html b/files/zh-cn/web/api/serviceworker/onstatechange/index.html
new file mode 100644
index 0000000000..1ac245dfd4
--- /dev/null
+++ b/files/zh-cn/web/api/serviceworker/onstatechange/index.html
@@ -0,0 +1,123 @@
+---
+title: ServiceWorker.onstatechange
+slug: Web/API/ServiceWorker/onstatechange
+translation_of: Web/API/ServiceWorker/onstatechange
+---
+<div>{{SeeCompatTable}}{{APIRef("Service Workers API")}}</div>
+
+<p>一个 {{domxref("EventListener")}} 联动的属性，其会被任何stagechange类型事件抛出时联动; 它也基本上能在任何时候{{domxref("ServiceWorker.state")}} 改变时被抛出.</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">ServiceWorker.onstatechange = function(statechangeevent) { ... }
+ServiceWorker.addEventListener('statechange', function(statechangeevent) { ... } )</pre>
+
+<h2 id="示例">示例</h2>
+
+<p>这段代码出自 <a href="https://github.com/GoogleChrome/samples/blob/gh-pages/service-worker/registration-events/index.html">service worker registration-events sample</a> (<a href="https://googlechrome.github.io/samples/service-worker/registration-events/">live demo</a>). 它会监听 {{domxref("ServiceWorker.state")}} 的改变并返回它的值.</p>
+
+<pre class="brush: js">var serviceWorker;
+if (registration.installing) {
+  serviceWorker = registration.installing;
+  document.querySelector('#kind').textContent = 'installing';
+} else if (registration.waiting) {
+  serviceWorker = registration.waiting;
+  document.querySelector('#kind').textContent = 'waiting';
+} else if (registration.active) {
+  serviceWorker = registration.active;
+  document.querySelector('#kind').textContent = 'active';
+}
+
+if (serviceWorker) {
+  logState(serviceWorker.state);
+  serviceWorker.addEventListener('statechange', function(e) {
+  logState(e.target.state);
+  });
+}</pre>
+
+<p>注意当<code>statechange</code> 抛出时, service worker的引用可能已经改变。例如:</p>
+
+<pre class="brush: js">navigator.serviceWorker.register(..).then(function(swr) {
+  swr.installing.state == "installing"
+  swr.installing.onstatechange = function() {
+    swr.installing == null;
+    // At this point, swr.waiting OR swr.active might be true. This is because the statechange
+    // event gets queued, meanwhile the underlying worker may have gone into the waiting
+    // state and will be immediately activated if possible.
+  }
+})</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">规范</th>
+   <th scope="col">状态</th>
+   <th scope="col">附注</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('Service Workers', '#service-worker-onstatechange-attribute', 'ServiceWorker.onstatechange')}}</td>
+   <td>{{Spec2('Service Workers')}}</td>
+   <td>Initial definition</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Chrome</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari (WebKit)</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatChrome(40.0)}}</td>
+   <td>{{ CompatGeckoDesktop("44.0") }}<sup>[1]</sup></td>
+   <td>{{CompatNo}}</td>
+   <td>24</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Android Webview</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>Firefox OS</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+   <th>Chrome for Android</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{ CompatGeckoMobile("44.0") }}</td>
+   <td>{{ CompatVersionUnknown }}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatChrome(40.0)}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<p>[1] Service workers (and <a href="/en-US/docs/Web/API/Push_API">Push</a>) have been disabled in the <a href="https://www.mozilla.org/en-US/firefox/organizations/">Firefox 45 and 52 Extended Support Releases</a> (ESR.)</p>