Node-RED使用指南：15:使用switch进行多路输入和多路输出

拼搏现实的明天。 2023-07-12 14:11 31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]  
这篇文章继续介绍通过具体的示例使用switch处理多路输入和多路输出的方法。

# 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

# flow生成和设定 #

生成下图所示的flow  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdW1pYW9jbg_size_16_color_FFFFFF_t_70 1]

*  Inject节点：issue  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdW1pYW9jbg_size_16_color_FFFFFF_t_70 2]
 *  Inject节点：bug  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdW1pYW9jbg_size_16_color_FFFFFF_t_70 3]
 *  Inject节点：codeline  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdW1pYW9jbg_size_16_color_FFFFFF_t_70 4]
 *  switch节点：分支选择  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdW1pYW9jbg_size_16_color_FFFFFF_t_70 5]
 *  Debug节点：issue  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdW1pYW9jbg_size_16_color_FFFFFF_t_70 6]
 *  Debug节点：bug  
    ![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：codeline  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdW1pYW9jbg_size_16_color_FFFFFF_t_70 8]

# 结果确认 #

执行部署之后，分别手工触发三个Inject类型的输入节点，结果如下所示：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdW1pYW9jbg_size_16_color_FFFFFF_t_70 9]

# json格式的输出 #

[{ "id":"bd397316.dd008","type":"inject","z":"73554227.4474dc","name":"issue:10","topic":"issue","payload":"10","payloadType":"num","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":180,"y":340,"wires":[["4f9d5d85.cedb34"]]},{ "id":"b9fa5ac6.eaa208","type":"inject","z":"73554227.4474dc","name":"bug:2","topic":"bug","payload":"2","payloadType":"num","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":190,"y":420,"wires":[["4f9d5d85.cedb34"]]},{ "id":"a64a71da.22b98","type":"inject","z":"73554227.4474dc","name":"codeline:1000","topic":"codeline","payload":"1000","payloadType":"num","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":190,"y":500,"wires":[["4f9d5d85.cedb34"]]},{ "id":"4f9d5d85.cedb34","type":"switch","z":"73554227.4474dc","name":"分支选择","property":"topic","propertyType":"msg","rules":[{ "t":"eq","v":"issue","vt":"str"},{ "t":"eq","v":"bug","vt":"str"},{ "t":"eq","v":"codeline","vt":"str"}],"checkall":"true","repair":false,"outputs":3,"x":380,"y":420,"wires":[["1caeac40.cacba4"],["6d8c515d.203df"],["f8aea65c.5bb548"]]},{ "id":"1caeac40.cacba4","type":"debug","z":"73554227.4474dc","name":"issue","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","x":600,"y":340,"wires":[]},{ "id":"6d8c515d.203df","type":"debug","z":"73554227.4474dc","name":"bug","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","x":600,"y":420,"wires":[]},{ "id":"f8aea65c.5bb548","type":"debug","z":"73554227.4474dc","name":"codeline","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","x":600,"y":500,"wires":[]}]

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