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----
-title: Idle
-slug: WebAPI/Idle
-translation_of: Archive/B2G_OS/API/Idle_API
----
-<p>{{ non-standard_header() }}</p>
-<p>{{ B2GOnlyHeader2('certified') }}</p>
-<h2 id="摘要">摘要</h2>
-<p>當使用者讓裝置進入閒置/待機狀態，可通知 App 以採取相對應的行動。最常見的情形就是待機省電。而待機省電狀態又可另外搭配 <a href="https://developer.mozilla.org/en-US/docs/WebAPI/Power_Management" title="/en-US/docs/WebAPI/Power_Management">Power Management API</a>。</p>
-<h2 id="Idle_Observer">Idle Observer</h2>
-<p>若要讓任一 App 收到「系統閒置」的通知，就必須先註冊 Idle Observer。而 Idle Observer 物件具備了 3 項屬性：</p>
-<ul>
-  <li><code>time</code> 屬性將定義使用者最後的動作之後，理應進入閒置/待機狀態的時間 (以秒計算)。</li>
-  <li><code>onidle</code> 屬性則是判斷使用者閒置之後，所會呼叫的函式。</li>
-  <li><code>onactive</code> 屬性則是使用者再度啟動裝置之後，所會呼叫的函式。</li>
-</ul>
-<pre class="brush: js">// NOTE: mozPower is part of the Power Management API
-
-var fadeLight = {
-  time: 10, // Ten seconds
-
-  onidle: function () {
-    // The user does not seem active, let's dim the screen down
-    navigator.mozPower.screenBrightness = 0.5;
-  },
-
-  onactive: function () {
-    // Ok, the user is back, let's brighten the screen up
-    navigator.mozPower.screenBrightness = 1;
-  }
-}
-
-var screenOff = {
-  time: 15, // fifteen seconds
-
-  onidle: function () {
-    // Ok, the user had his chance but he's really idle, let's turn the screen off
-    navigator.mozPower.screenEnabled = false;
-  },
-
-  onactive: function () {
-    // Ok, the user is back, let's turn the screen on
-    navigator.mozPower.screenEnabled = true;
-  }
-}
-</pre>
-<p>任一 App 均可依需要而定義為多個 Idle Observer。但不論定義成幾個 Idle Observer，都必須以 <a href="https://developer.mozilla.org/en-US/docs/DOM/window.navigator.addIdleObserver" title="/en-US/docs/DOM/window.navigator.addIdleObserver"><code>navigator.addIdleObserver()</code></a> 函式完成註冊，才能由系統所處理。</p>
-<pre class="brush: js">navigator.addIdleObserver(fadeLight);
-navigator.addIdleObserver(screenOff);
-</pre>
-<p>又如果 App 不再需要知道使用者是否閒置了系統，則可透過 <a href="https://developer.mozilla.org/en-US/docs/DOM/window.navigator.removeIdleObserver" title="/en-US/docs/DOM/window.navigator.removeIdleObserver"><code>navigator.removeIdleObserver()</code></a> 函式移除 Idle Observer。</p>
-<pre class="brush: js">navigator.removeIdleObserver(fadeLight);
-navigator.removeIdleObserver(screenOff);
-</pre>
-<h2 id="規格">規格</h2>
-<p>目前仍未有任何規格，但 W3C 將此 API 納入為 <a href="http://www.w3.org/2012/sysapps/" title="http://www.w3.org/2012/sysapps/">System Applications Working Group</a> 討論的一部分。</p>
-<h2 id="另可參閱">另可參閱</h2>
-<ul>
-  <li>{{domxref("window.navigator.addIdleObserver","navigator.addIdleObserver")}}</li>
-  <li>{{domxref("window.navigator.removeIdleObserver","navigator.removeIdleObserver")}}</li>
-</ul>