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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

inject 节点设定：注意选中 inject once 复选框

debug 节点设定：显示 topic 属性内容

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：

触发方式 2: 指定时间间隔重复触发

inject 节点设定：设定每 3 秒触发

debug 节点设定：显示 topic 属性内容

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":[]}]

结果确认

执行 deploy 操作之后，可以看到结果显示如下图所示：

触发方式 3: 指定时间触发

inject 节点设定：指定周日 20:02 触发

debug 节点设定：显示 topic 属性内容

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：

来源：

nodered 澳门人威尼斯3966官网：

noderedgithub：

nodered 英文社区：

nodered 中文社区：https://www.iotschool.com/topics/node81

nodered 中文社区 qq 群：8604461