前言
随着智能家居设备的普及，越来越多的家庭开始使用智能电视。但是，如何通过编程来控制智能电视，并与其他智能设备联动，成为了一个热门的话题。node-red-contrib-jointspace 就是针对智能电视的一个 npm 包，它提供了一些简单易用的指令，可以通过编程的方式来控制智能电视。
安装
1.首先需要安装 node.js 和 npm 包管理器。
2.执行以下命令安装 node-red：
npm install -g node-red
3.打开命令行工具，进入 node-red 安装目录，执行以下命令安装 node-red-contrib-jointspace：
npm install node-red-contrib-jointspace
使用
概述
node-red-contrib-jointspace 主要提供了三个节点：
usb-button 用于模拟遥控器按键。
get-status 用于查询电视状态。
switch-on-off 用于开关电视。
usb-button
usb-button 节点用于模拟遥控器按键，可以通过编程的方式来控制电视。在使用 usb-button 节点之前，需要先了解电视遥控器按键的编码，这些编码可以在网络上找到。以下是一个示例代码，演示了如何使用 usb-button 节点来控制电视。
[{"id":"d1d2db54.c86048","type":"usb-button","z":"7a2ab46a.bfaf7c","name":"Power","hex":" 0x08 0x22","x":400,"y":200,"wires":[]},{"id":"a56e67f5.5fdb98","type":"inject","z":"7a2ab46a.bfaf7c","name":"Send Power Signal","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"payload":"","payloadType":"date","x":160,"y":200,"wires":[["d1d2db54.c86048"]]}]get-status
get-status 节点用于查询电视状态，可以获取电视的音量、频道、输入源等信息。以下是一个示例代码，演示了如何使用 get-status 节点来获取电视的状态。
[{"id":"d5b6c5bf.0ed3c","type":"get-status","z":"7a2ab46a.bfaf7c","name":"","x":427.5,"y":306,"wires":[["82dbd66d.8f05b"]]},{"id":"82dbd66d.8f05b","type":"debug","z":"7a2ab46a.bfaf7c","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","statusVal":"","statusType":"auto","x":678,"y":306,"wires":[]},{"id":"109454df.8c4e4f","type":"inject","z":"7a2ab46a.bfaf7c","name":"send-get-status-command","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"payload":"","payloadType":"date","x":198.5,"y":305,"wires":[["d5b6c5bf.0ed3c"]]}]switch-on-off
switch-on-off 节点用于开关电视。以下是一个示例代码，演示了如何使用 switch-on-off 节点来开关电视。
[{"id":"3623fa9d.11c8b4","type":"switch-on-off","z":"7a2ab46a.bfaf7c","name":"On","state":"ON","x":400,"y":96,"wires":[]},{"id":"2c8d066a.7b9142","type":"inject","z":"7a2ab46a.bfaf7c","name":"Turn On","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"payload":"","payloadType":"date","x":158,"y":96,"wires":[["3623fa9d.11c8b4"]]}]结语
通过本篇文章的学习，读者可以掌握如何使用 node-red-contrib-jointspace 包来控制智能电视。作为一个开源的 npm 包，node-red-contrib-jointspace 还有很多功能可以探索。希望读者可以进一步学习和理解这个包的原理和实现方法，以便更好地应用于实际项目中。
来源：JavaScript中文网 ，转载请注明来源 https://www.javascriptcn.com/post/600671d530d0927023822ade