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----
-title: Alarm API
-slug: WebAPI/Alarm
-translation_of: Archive/B2G_OS/API/Alarm_API
----
-<p>{{ SeeCompatTable() }}</p>
-<h2 id="摘要">摘要</h2>
-<p>Alarm API 可存取裝置的警示設定功能。而警示設定功能可排定通知的時間,或在特定時間啟動某個 App。如鬧鐘、行事曆、自動更新等的 Apps,就可能需要透過 Alarm API,在特定時點觸發裝置的特定動作。</p>
-<p>而 Alarm API 本身僅可進行警示排程。透過 System Message API 即可將警示發送到 Apps,因此若 Apps 要對警示做出反應,就必須先將 Apps 註冊至 <code>alarm</code> 訊息。</p>
-<p>另外,使用 <a href="https://developer.mozilla.org/en-US/docs/Web/API/MozAlarmsManager" title="/en-US/docs/Web/API/MozAlarmsManager"><code>MozAlarmsManager</code></a> 介面的 <a href="https://developer.mozilla.org/en-US/docs/Web/API/window.navigator.mozAlarms" title="/en-US/docs/Web/API/window.navigator.mozAlarms"><code>window.navigator.mozAlarms</code></a> 物件,即可設定警示。</p>
-<h2 id="example" name="example">警示排程</h2>
-<p>使用警示功能的第一件事,就是警示排程。若依照時區來分,共可分成 2 種警示,且均可透過 <a href="https://developer.mozilla.org/en-US/docs/Web/API/MozAlarmsManager.add" title="/en-US/docs/Web/API/MozAlarmsManager.add"><code>MozAlarmsManager.add</code></a> 函式進行排程。</p>
-<div class="note">
- <p><strong>注意:</strong>若未針對特定 Apps 來設定警示,則只要是正在監聽警示的 Apps,均將接到系統所發送的警示。</p>
-</div>
-<h3 id="忽略時區的警示">忽略時區的警示</h3>
-<p>系統將根據裝置的本端時間,發送此類警示。若裝置變更了時區設定,則系統將根據新的時區而發送警示。舉例來說,如果使用者位在巴黎,設定了 12 PM CET (<em>Central European Time</em>) 發出警示,結果出差到舊金山時,那同樣會在 12 PM PDT (<em>Pacific Daylight Time</em>) 發送警示。</p>
-<pre class="brush: js">// This the date to schedule the alarm
-var myDate = new Date("May 15, 2012 16:20:00");
-
-// This is arbitrary data pass to the alarm
-var data = {
- foo: "bar"
-}
-
-// The "ignoreTimezone" string is what make the alarm ignoring it
-var request = navigator.mozAlarms.add(myDate, "ignoreTimezone", data);
-
-request.onsuccess = function () {
- console.log("The alarm has been scheduled");
-};
-
-request.onerror = function () {
- console.log("An error occurred: " + this.error.name);
-};
-</pre>
-<h3 id="遵守時區的警示">遵守時區的警示</h3>
-<p>系統將根據排程當下的時區,發送此類警示。若裝置因為某個理由變更了時區,系統同樣是根據原始的排程時區而發出警示。舉例來說,如果使用者位在巴黎,設定於 12 PM CET (<em>Central European Time</em>) 發送警示,結果出差到舊金山時,系統將於 3 AM PDT (<em>Pacific Daylight Time</em>) 發送警示。</p>
-<pre class="brush: js">// This the date to schedule the alarm
-var myDate = new Date("May 15, 2012 16:20:00");
-
-// This is arbitrary data pass to the alarm
-var data = {
- foo: "bar"
-}
-
-// The "honorTimezone" string is what make the alarm honoring it
-var request = navigator.mozAlarms.add(myDate, "honorTimezone", data);
-
-request.onsuccess = function () {
- console.log("The alarm has been scheduled");
-};
-
-request.onerror = function () {
- console.log("An error occurred: " + this.error.name);
-};
-</pre>
-<h2 id="管理警示">管理警示</h2>
-<p>針對目前 App 已排定的警示,<a href="https://developer.mozilla.org/en-US/docs/Web/API/MozAlarmsManager.getAll" title="/en-US/docs/Web/API/MozAlarmsManager.getAll"><code>MozAlarmsManager.getAll</code></a> 函式將回傳完整的警示清單。這份清單則為<a href="https://developer.mozilla.org/en-US/docs/WebAPI/Alarm#mozAlarm"> mozAlarm</a> 物件的<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array" title="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array">陣列</a>。</p>
-<h3 id="mozAlarm">mozAlarm</h3>
-<p>這些物件均為非同步 JavaScript 物件,並包含下列屬性:</p>
-<dl>
- <dt>
- <code>id</code></dt>
- <dd>
- 1 組號碼代表警示的 ID</dd>
- <dt>
- <code>date</code></dt>
- <dd>
- <a href="https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Date" title="/en-US/docs/JavaScript/Reference/Global_Objects/Date">Date</a> 物件代表警示的排程時間</dd>
- <dt>
- <code>respectTimezone</code></dt>
- <dd>
- 1 組字串指出警示將遵守或忽略 <code>date</code> 物件的時區資訊。該值可為 <code>ignoreTimezone</code> 或 <code>honorTimezone </code></dd>
- <dt>
- <code>data</code></dt>
- <dd>
- 與警示一同儲存的所有資料,均納入此 JavaScript 物件中</dd>
-</dl>
-<pre class="brush: js">var request = navigator.mozAlarms.getAll();
-
-request.onsuccess = function () {
- this.result.forEach(function (alarm) {
- console.log('Id: ' + alarm.id);
- console.log('date: ' + alarm.date);
- console.log('respectTimezone: ' + alarm.respectTimezone);
- console.log('data: ' + JSON.stringify(alarm.data));
- });
-};
-
-request.onerror = function () {
- console.log("An error occurred: " + this.error.name);
-};
-</pre>
-<p><a href="https://developer.mozilla.org/en-US/docs/Web/API/MozAlarmsManager.remove" title="/en-US/docs/Web/API/MozAlarmsManager.remove"><code>MozAlarmsManager.remove</code></a> 函式則可解除已排程的警示。</p>
-<pre class="brush: js">var alarmId;
-
-// Set an alarm and store it's id
-var request = navigator.mozAlarms.add(new Date("May 15, 2012 16:20:00"), "honorTimezone");
-
-request.onsuccess = function () {
- alarmId = this.result;
-}
-
-// ...
-
-// Later on, removing the alarm if it exists
-if (alarmId) {
- navigator.mozAlarms.remove(alarmId);
-}
-</pre>
-<h2 id="處理警示">處理警示</h2>
-<p>在系統發送警示之後,任何 Apps 均可做出回應。為了要能處理警示,Apps 必須將本身註冊為警示處理器 (Alarm handler)。透過 System Messaging API 的 2 個步驟即可完成註冊:</p>
-<p>首先,Apps 必須將 <code>alarm</code> 納入<a href="https://developer.mozilla.org/en-US/docs/Apps/Manifest#messages" title="/en-US/docs/Apps/Manifest#messages">本身 manifest 檔案的 message 屬性</a>中,而此 manifest 檔案需包含「已註冊回呼 (Callback) 函式的文件」之網址。一旦發送警示時,就會呼叫該文件中所註冊的回呼函式。</p>
-<pre class="brush: js">"messages": [
- { "alarm": "/index.html" }
-]</pre>
-<p>其次,Apps 必須以 <code>alarm</code> 訊息綁定回呼函式;可透過 <a href="https://developer.mozilla.org/en-US/docs/Web/API/window.navigator.mozSetMessageHandler" title="/en-US/docs/Web/API/window.navigator.mozSetMessageHandler"><code>navigator.mozSetMessageHandler</code></a> 函式完成此步驟。此回呼函式將接收 <a href="https://developer.mozilla.org/en-US/docs/WebAPI/Alarm#mozAlarm">mozAlarm</a> 物件,其內為警示所附掛的資料。</p>
-<pre class="brush: js">navigator.mozSetMessageHandler("alarm", function (mozAlarm) {
- alert("alarm fired: " + JSON.stringify(mozAlarm.data));
-});
-</pre>
-<p>如果 App 想確認是否有警示延宕在系統端尚未發出,則可使用<a href="https://developer.mozilla.org/en-US/docs/Web/API/window.navigator.mozHasPendingMessage" title="/en-US/docs/Web/API/window.navigator.mozHasPendingMessage"><code>navigator.mozHasPendingMessage</code></a> 函式並搭配 <code>alarm</code> 值。</p>
-<pre class="brush: js">navigator.mozHasPendingMessage("alarm");
-</pre>
-<h2 id="規格">規格</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('Alarm API')}}</td>
- <td>{{Spec2('Alarm API')}}</td>
- <td>Initial specification.</td>
- </tr>
- </tbody>
-</table>
-<h2 id="瀏覽器相容性">瀏覽器相容性</h2>
-<p>{{ CompatibilityTable() }}</p>
-<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</th>
- </tr>
- <tr>
- <td>Basic support</td>
- <td>{{ CompatUnknown()}}</td>
- <td>{{CompatGeckoDesktop("16")}} {{ property_prefix("moz") }}</td>
- <td>{{ CompatNo() }}</td>
- <td>{{ CompatNo() }}</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>Chrome for Android</th>
- <th>Firefox Mobile (Gecko)</th>
- <th>IE Mobile</th>
- <th>Opera Mobile</th>
- <th>Safari Mobile</th>
- </tr>
- <tr>
- <td>Basic support</td>
- <td>{{ CompatUnknown() }}</td>
- <td>{{ CompatNo() }}</td>
- <td>{{CompatGeckoMobile("10")}} {{ property_prefix("moz") }}</td>
- <td>{{ CompatNo() }}</td>
- <td>{{ CompatNo() }}</td>
- <td>{{ CompatNo() }}</td>
- </tr>
- </tbody>
- </table>
-</div>
-<h2 id="另可參閱">另可參閱</h2>
-<ul>
- <li>{{domxref("window.navigator.mozAlarms","navigator.mozAlarms")}}</li>
- <li>{{domxref("MozAlarmsManager")}}</li>
- <li>{{domxref("window.navigator.mozSetMessageHandler")}}</li>
-</ul>