mirror of
https://github.com/node-red/node-red.git
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34 lines
2.2 KiB
HTML
34 lines
2.2 KiB
HTML
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<!--
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Copyright JS Foundation and other contributors, http://js.foundation
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<script type="text/x-red" data-help-name="trigger">
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<p>触发后，将会发送一条消息。如果被拓展或重置，则可以选择发送第二条消息。</p>
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<h3>输入</h3>
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<dl class="message-properties">
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<dt class="optional">reset</dt>
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<dd>如果收到带有此属性的消息，则将清除当前正在进行的任何超时或重复，且不会触发任何消息。</dd>
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</dl>
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<h3>详细</h3>
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<p>该节点可用于在流中创建一个超时。 默认情况下，当它收到一条消息时，它将发送一条带有<code>1</code>的payload的消息。然后它将等待250毫秒，再发送第二条消息，其payload为<code>0</code>。这可以用于使连接到Raspberry Pi GPIO引脚的LED闪烁等例子上。</p>
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<p>可以将发送的每个消息的payload配置为各种值，包括不发送任何内容的选项。例如，将初始消息设置为<i>nothing</i>，然后选择将计时器与每个收到的消息一起扩展的选项，则该节点将充当看门狗计时器；仅在设置的间隔内未收到任何消息时才发送消息。</p>
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<p>如果设置为<i>字符串</i>类型，则该节点支持<i>mustache</i>模板语法。</p>
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<p>如果节点收到具有<code>reset</code>属性或与节点中配置的匹配的<code>payload</code>的消息，则将清除当前正在进行的任何超时或重复，并且不会触发任何消息。</p>
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<p>可以将节点配置为以固定的时间间隔重新发送消息，直到被收到的消息重置为止。</p>
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<p>（可选）可以将节点配置为将带有<code>msg.topic</code>的消息视为独立的流。</p>
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</script>
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