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+---
+title: alarms.create()
+slug: Mozilla/Add-ons/WebExtensions/API/alarms/create
+tags:
+  - API
+  - WebExtensions
+  - alarms
+  - 创建
+  - 参考
+  - 拓展
+  - 方法
+  - 附件
+  - 非标准
+translation_of: Mozilla/Add-ons/WebExtensions/API/alarms/create
+---
+<div>{{AddonSidebar()}}</div>
+
+<p>创建一个新的alarm.</p>
+
+<h2 id="使用语法">使用语法</h2>
+
+<pre class="syntaxbox brush:js">browser.alarms.create(
+  name,              // 可选的字符串(string)类型
+  alarmInfo          // 可选的对象(object)类型
+)
+</pre>
+
+<h3 id="参数介绍">参数介绍</h3>
+
+<dl>
+ <dt><code>name</code>{{optional_inline}}</dt>
+ <dd><code>字符串(string)类型。</code>alarm的名称。默认为空的字符串。</dd>
+ <dd>alarm的名称可以在{{WebExtAPIRef('alarms.get()')}}方法和{{WebExtAPIRef('alarms.clear()')}}方法中引用。同时它也可以通过{{WebExtAPIRef('alarms.onAlarm')}}监听方法传入的参数对象{{WebExtAPIRef('alarms.Alarm')}}的name属性访问到。</dd>
+ <dd>Alarm的名称是唯一的 (在单个附件范围内). 如果传入了已经在这个附件存在的名称， 原来的同名alarm会被移除并且没有警告。</dd>
+ <dt><code>alarmInfo</code>{{optional_inline}}</dt>
+ <dd>
+ <p><code>对象(object)类型</code>. 你可以对过它来指定什么时间alarm会开始触发，其值可以是一个具体的时间值或者是一个延时（从alarm设置开始）。为了让alarm能复现，需要指定<code>periodInMinutes。</code></p>
+
+ <p>在Chrome浏览器上，除非附件以非打包(unpackaged)方式加载，alarm的创建每分钟不允许超过一次。如果附件尝试设置<code>delayInMinutes</code><code>为小于1的值，alarm只能在到达1分钟之后才会触发，并且会变成每分钟触发一次。</code></p>
+
+ <p><code>alarmInfo对象</code>可以设置以下属性:</p>
+ </dd>
+ <dd>
+ <dl class="reference-values">
+  <dt><code>when</code>{{optional_inline}}</dt>
+  <dd><code>double类型</code>. alarm第一次触发的时间，值为自1970-01-01 00:00:00 UTC过去的毫秒数。请使用<code><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/now">Date.now()</a>来获取</code>1970-01-01 00:00:00 UTC到<code>当前时间过去的毫秒数。如果你设置了when属性，请不要设置delayInMinutes属性。</code></dd>
+  <dt><code>delayInMinutes</code>{{optional_inline}}</dt>
+  <dd><code>double类型</code>. alarm设置好到第一次触发之间的分钟数。如果你设置了<code>delayInMinutes属性，请不要设置when属性。</code></dd>
+  <dt><code>periodInMinutes</code>{{optional_inline}}</dt>
+  <dd><code>double类型</code>. 如果设置此属性，alarm会从第一次触发开始每隔<code>periodInMinutes分钟再次触发。如果你没有设置when及delayInMinutes属性，alarm会在alarm设置好之后periodInMinutes分钟第一次触发。如果periodInMinutes属性没有设置，则alarm只会触发一次。</code></dd>
+ </dl>
+ </dd>
+</dl>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<p class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
+
+<p>{{Compat("webextensions.api.alarms.create")}}</p>
+
+<h2 id="示例">示例</h2>
+
+<p>Create a one-time delay-based alarm with "" for the name:</p>
+
+<pre class="brush: js">const delayInMinutes = 5;
+
+<span class="pl-smi">browser</span>.<span class="pl-smi">alarms</span>.<span class="pl-en">create</span>({
+  delayInMinutes
+});</pre>
+
+<p>Create a periodic delay-based alarm named "my-periodic-alarm":</p>
+
+<pre class="brush: js">const delayInMinutes = 5;
+const periodInMinutes = 2;
+
+browser.alarms.create("my-periodic-alarm", {
+  delayInMinutes,
+  periodInMinutes
+});</pre>
+
+<p>Create a periodic absolute alarm named "my-periodic-alarm":</p>
+
+<pre class="brush: js">const when = 1545696000;
+const periodInMinutes = 2;
+
+browser.alarms.create("my-periodic-alarm", {
+  when,
+  periodInMinutes
+});</pre>
+
+<div class="note"><strong>Acknowledgements</strong>
+
+<p>This API is based on Chromium's <a href="https://developer.chrome.com/extensions/alarms"><code>chrome.alarms</code></a> API.</p>
+
+<p>Microsoft Edge compatibility data is supplied by Microsoft Corporation and is included here under the Creative Commons Attribution 3.0 United States License.</p>
+</div>
+
+<div class="hidden">
+<pre>// Copyright 2015 The Chromium Authors. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+</pre>
+</div>