Node-RED使用指南：14:Inject节点的触发方式

川长思鸟来 2023-07-12 14:08 39阅读 0赞

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdW1pYW9jbg_size_16_color_FFFFFF_t_70]  
这篇文章介绍一下Inject节点除了手动触发之外的其他方式。

# 事前准备 #

以容器方式启动Node-RED服务，启动命令如下所示：

> 启动命令：docker run -it -p 1880:1880 -v $PWD/data:/data -e TZ=Asia/Shanghai --name nodered -d nodered/node-red:1.0.4

# 触发方式1: Deploy时触发 #

![在这里插入图片描述][2020030819461842.png]

*  Inject节点设定：注意选中Inject once复选框  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdW1pYW9jbg_size_16_color_FFFFFF_t_70 1]
 *  Debug节点设定：显示topic属性内容  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdW1pYW9jbg_size_16_color_FFFFFF_t_70 2]
 *  flow的json表示（export输出结果）

[{ "id":"347308fb.329ec8","type":"inject","z":"73554227.4474dc","name":"Deploy时触发","topic":"Deploy时会被触发","payload":"","payloadType":"date","repeat":"","crontab":"","once":true,"onceDelay":0.1,"x":160,"y":120,"wires":[["bae1bac5.1ad7a8"]]},{ "id":"bae1bac5.1ad7a8","type":"debug","z":"73554227.4474dc","name":"显示topic信息","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"topic","targetType":"msg","x":400,"y":120,"wires":[]}]

*  结果确认  
    执行Deploy操作之后，可以看到结果显示如下图所示：  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdW1pYW9jbg_size_16_color_FFFFFF_t_70 3]

# 触发方式2: 指定时间间隔重复触发 #

![在这里插入图片描述][20200308195433463.png]

*  Inject节点设定：设定每3秒触发  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdW1pYW9jbg_size_16_color_FFFFFF_t_70 4]
 *  Debug节点设定：显示topic属性内容  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdW1pYW9jbg_size_16_color_FFFFFF_t_70 5]
 *  flow的json表示（export输出结果）

[{ "id":"347308fb.329ec8","type":"inject","z":"73554227.4474dc","name":"每三秒钟触发","topic":"每三秒触发","payload":"","payloadType":"date","repeat":"3","crontab":"","once":false,"onceDelay":0.1,"x":160,"y":120,"wires":[["bae1bac5.1ad7a8"]]},{ "id":"bae1bac5.1ad7a8","type":"debug","z":"73554227.4474dc","name":"显示topic信息","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"topic","targetType":"msg","x":400,"y":120,"wires":[]}]

# 触发方式3: 指定时间触发 #

![在这里插入图片描述][20200308200208760.png]

*  Inject节点设定：指定周日20:02触发  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdW1pYW9jbg_size_16_color_FFFFFF_t_70 7]
 *  Debug节点设定：显示topic属性内容  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdW1pYW9jbg_size_16_color_FFFFFF_t_70 5]
 *  flow的json表示（export输出结果）

[{ "id":"347308fb.329ec8","type":"inject","z":"73554227.4474dc","name":"周日20:02触发","topic":"指定周日20:02触发","payload":"","payloadType":"date","repeat":"","crontab":"02 20 * * 0","once":false,"onceDelay":0.1,"x":160,"y":120,"wires":[["bae1bac5.1ad7a8"]]},{ "id":"bae1bac5.1ad7a8","type":"debug","z":"73554227.4474dc","name":"显示topic信息","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"topic","targetType":"msg","x":400,"y":120,"wires":[]}]

*  结果确认  
    执行Deploy操作之后，等到周日的20:02可以看到结果显示如下图所示：  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdW1pYW9jbg_size_16_color_FFFFFF_t_70 8]

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[2020030819461842.png]: https://img-blog.csdnimg.cn/2020030819461842.png
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[20200308195433463.png]: https://img-blog.csdnimg.cn/20200308195433463.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdW1pYW9jbg_size_16_color_FFFFFF_t_70 4]: https://img-blog.csdnimg.cn/20200308195820190.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdW1pYW9jbg==,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdW1pYW9jbg_size_16_color_FFFFFF_t_70 5]: https://img-blog.csdnimg.cn/20200308195510878.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdW1pYW9jbg==,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdW1pYW9jbg_size_16_color_FFFFFF_t_70 6]: https://img-blog.csdnimg.cn/20200308195925255.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdW1pYW9jbg==,size_16,color_FFFFFF,t_70
[20200308200208760.png]: https://img-blog.csdnimg.cn/20200308200208760.png
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