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<!DOCTYPE html>
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<title>chrome.alarms - chrome插件中文开发文档(非官方)</title>
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<h1 class="page_title">chrome.alarms</h1>
<div id="toc">
<h2>Contents</h2>
<ol>
<li>
<a href="#apiReference">API reference: chrome.alarms</a>
<ol>
<li><a href="#types">Types</a><ol> <li> <a href="#type-Alarm">Alarm</a> </li> <li> <a href="#type-AlarmCreateInfo">AlarmCreateInfo</a> </li></ol></li>
<li><a href="#methods">Methods</a><ol> <li><a href="#method-create">create</a></li> <li><a href="#method-get">get</a></li> <li><a href="#method-getAll">getAll</a></li> <li><a href="#method-clear">clear</a></li> <li><a href="#method-clearAll">clearAll</a></li></ol></li>
<li><a href="#events">Events</a><ol> <li><a href="#event-onAlarm">onAlarm</a></li></ol></li>
<li><a href="#samples">Sample Extensions</a></li>
</ol>
</li>
</ol>
</div>
<h2 id="apiReference">API Reference: chrome.alarms</h2>
<div class="api_reference">
<h3 id="types">Types</h3>
<div>
<h3 id="type-Alarm">Alarm</h3>
<div>
<dt><span class="type_name"> ( <span id="typeTemplate">object</span> )</span></dt>
<h4 id="Alarm-properties">
Properties of <a href="#type-Alarm">Alarm</a>
</h4>
<dd><dl> <div>
<a name="property-Alarm-periodInMinutes"></a>
<dt>
<span class="variable">periodInMinutes</span>
<span class="property">
(
<span class="optional">optional</span>
<span id="typeTemplate">double</span>
)
</span>
</dt>
<dd>
If not null, the alarm is a repeating alarm and will fire again in <var>periodInMinutes</var> minutes.
</dd>
</div>
<div>
<a name="property-Alarm-scheduledTime"></a>
<dt>
<span class="variable">scheduledTime</span>
<span class="property">
(
<span id="typeTemplate">double</span>
)
</span>
</dt>
<dd>
Time at which this alarm was scheduled to fire, in milliseconds past the epoch (e.g. <code>Date.now() + n</code>). For performance reasons, the alarm may have been delayed an arbitrary amount beyond this.
</dd>
</div>
<div>
<a name="property-Alarm-name"></a>
<dt>
<span class="variable">name</span>
<span class="property">
(
<span id="typeTemplate">string</span>
)
</span>
</dt>
<dd>
Name of this alarm.
</dd>
</div>
</dl></dd>
</div>
</div>
<div>
<h3 id="type-AlarmCreateInfo">AlarmCreateInfo</h3>
<div>
<dt><span class="type_name"> ( <span id="typeTemplate">object</span> )</span></dt>
<h4 id="AlarmCreateInfo-properties">
Properties of <a href="#type-AlarmCreateInfo">AlarmCreateInfo</a>
</h4>
<dd><dl> <div>
<a name="property-AlarmCreateInfo-delayInMinutes"></a>
<dt>
<span class="variable">delayInMinutes</span>
<span class="property">
(
<span class="optional">optional</span>
<span id="typeTemplate">double</span>
)
</span>
</dt>
<dd>
Length of time in minutes after which the <code>onAlarm</code> event should fire.<br/><br/> <!-- TODO: need minimum=0 -->
</dd>
</div>
<div>
<a name="property-AlarmCreateInfo-periodInMinutes"></a>
<dt>
<span class="variable">periodInMinutes</span>
<span class="property">
(
<span class="optional">optional</span>
<span id="typeTemplate">double</span>
)
</span>
</dt>
<dd>
If set, the onAlarm event should fire every <var>periodInMinutes</var> minutes after the initial event specified by <var>when</var> or <var>delayInMinutes</var>. If not set, the alarm will only fire once.<br/><br/> <!-- TODO: need minimum=0 -->
</dd>
</div>
<div>
<a name="property-AlarmCreateInfo-when"></a>
<dt>
<span class="variable">when</span>
<span class="property">
(
<span class="optional">optional</span>
<span id="typeTemplate">double</span>
)
</span>
</dt>
<dd>
Time at which the alarm should fire, in milliseconds past the epoch (e.g. <code>Date.now() + n</code>).
</dd>
</div>
</dl></dd>
</div>
</div>
<h3 id="methods">Methods</h3>
<div>
<h4 id="method-create">create</h4>
<div class="summary lower">
<span>chrome.alarms.create</span>(<span class="optional">string <span class="variable">name</span></span>, <span><a href="alarms.html#type-AlarmCreateInfo">AlarmCreateInfo</a> <span class="variable">alarmInfo</span></span>)
</div>
<div class="description">
<p>
Creates an alarm. Near the time(s) specified by <var>alarmInfo</var>, the <code>onAlarm</code> event is fired. If there is another alarm with the same name (or no name if none is specified), it will be cancelled and replaced by this alarm.<br/><br/> Note that granularity is not guaranteed: times are more of a hint to the browser. For performance reasons, alarms may be delayed an arbitrary amount of time before firing.
</p> <h4>Parameters</h4>
<dl>
<div> <a name="property-create-name"></a> <dt> <span class="variable">name</span> <span class="property"> ( <span class="optional">optional</span> <span id="typeTemplate">string</span> ) </span> </dt> <dd> Optional name to identify this alarm. Defaults to the empty string. </dd></div><div> <a name="property-create-alarmInfo"></a> <dt> <span class="variable">alarmInfo</span> <span class="property"> ( <span id="typeTemplate"><a href="alarms.html#type-AlarmCreateInfo">AlarmCreateInfo</a></span> ) </span> </dt> <dd> Describes when the alarm should fire. The initial time must be specified by either <var>when</var> or <var>delayInMinutes</var> (but not both). If <var>periodInMinutes</var> is set, the alarm will repeat every <var>periodInMinutes</var> minutes after the initial event. If neither <var>when</var> or <var>delayInMinutes</var> is set for a repeating alarm, <var>periodInMinutes</var> is used as the default for <var>delayInMinutes</var>. </dd></div>
</dl>
</div>
</div>
<div>
<h4 id="method-get">get</h4>
<div class="summary lower">
<span>chrome.alarms.get</span>(<span class="optional">string <span class="variable">name</span></span>)
</div>
<div class="description">
<p>
Retrieves details about the specified alarm.
</p> <h4>Parameters</h4>
<dl>
<div> <a name="property-get-name"></a> <dt> <span class="variable">name</span> <span class="property"> ( <span class="optional">optional</span> <span id="typeTemplate">string</span> ) </span> </dt> <dd> The name of the alarm to get. Defaults to the empty string. </dd></div>
</dl>
<h4>Callback function</h4><p> The <em>callback</em> parameter should specify a function that looks like this:</p><pre>function(<a href="alarms.html#type-Alarm">Alarm</a> alarm) <span class="subdued">{...}</span>;</pre><dl> <div> <a name="property-callback-alarm"></a> <dt> <span class="variable">alarm</span> <span class="property"> ( <span id="typeTemplate"><a href="alarms.html#type-Alarm">Alarm</a></span> ) </span> </dt></div></dl>
</div>
</div>
<div>
<h4 id="method-getAll">getAll</h4>
<div class="summary lower">
<span>chrome.alarms.getAll</span>()
</div>
<div class="description">
<p>
Gets an array of all the alarms.
</p> </div>
</div>
<div>
<h4 id="method-clear">clear</h4>
<div class="summary lower">
<span>chrome.alarms.clear</span>(<span class="optional">string <span class="variable">name</span></span>)
</div>
<div class="description">
<p>
Clears the alarm with the given name.
</p> <h4>Parameters</h4>
<dl>
<div> <a name="property-clear-name"></a> <dt> <span class="variable">name</span> <span class="property"> ( <span class="optional">optional</span> <span id="typeTemplate">string</span> ) </span> </dt> <dd> The name of the alarm to clear. Defaults to the empty string. </dd></div>
</dl>
</div>
</div>
<div>
<h4 id="method-clearAll">clearAll</h4>
<div class="summary lower">
<span>chrome.alarms.clearAll</span>()
</div>
<div class="description">
<p>
Clears all alarms.
</p> </div>
</div>
<h3 id="events">Events</h3>
<div>
<h4 id="event-onAlarm">onAlarm</h4>
<div class="summary">
<span class="subdued">chrome.alarms.</span>onAlarm<span class="subdued">.addListener</span>(function(<span><a href="alarms.html#type-Alarm">Alarm</a> <span class="variable">alarm</span></span>)<span class="subdued"> {...}</span>);
</div>
<div class="description">
<p>
Fired when an alarm has elapsed. Useful for event pages.
</p> <h4>Listener Parameters</h4>
<dl>
<div> <a name="property-onAlarm-alarm"></a> <dt> <span class="variable">alarm</span> <span class="property"> ( <span id="typeTemplate"><a href="alarms.html#type-Alarm">Alarm</a></span> ) </span> </dt> <dd> The alarm that has elapsed. </dd></div>
</dl>
</div>
</div>
</div>
<h2 id="samples">Sample Extensions that use chrome.alarms</h2>
<li><strong><a href="samples.html#d5d930bdcf3f5e1753d0de5924a89a65">Event Page Example</a></strong> –
Demonstrates usage and features of the event page
</li>
<li><strong><a href="samples.html#5139d19c542e2188a42418c27c9cdd5b">Google Mail Checker</a></strong> –
Displays the number of unread messages in your Google Mail inbox. You can also click the button to open your inbox.
</li>
</div>
</div>
</body>
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