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Node-RED简介与Windows上安装、启动和运行示例
Node-RED是一款流程自动化工具，基于Node.js，适合用于编写和运行各种自动化任务。以下将介绍如何在Windows环境上安装、启动并运行Node-RED示例，以及如何将流程导出为JSON文件，同时展示如何在Node-RED中创建WebSocket客户端。
安装与运行
首先，需要下载并安装Node-RED。可以通过以下步骤完成：
导出与导入JSON文件
Node-RED支持将流程导出为JSON文件，步骤如下：
建立WebSocket客户端
在Node-RED中创建WebSocket客户端，步骤如下：
流程配置与测试
完成上述配置后，确保WebSocket服务端已正确运行，并可以接收客户端连接。可以通过在浏览器中输入WebSocket服务地址（如ws://localhost:9898）来测试连接状态。
JSON数据示例
以下是一个JSON数据示例，展示了Node-RED中的一些节点配置：
{"id": "f4a4d8eab7935bc8","type": "tab","label": "流程 3","disabled": false,"info": "","env": []}
{"id": "c428312d1f6165d1","type": "mqtt-broker","name": "mqtt","broker": "127.0.0.1","port": "1883","clientid": "","autoConnect": true,"usetls": false,"protocolVersion": "4","keepalive": "60","cleansession": true,"birthTopic": "","birthQos": "0","birthPayload": "","birthMsg": {},"closeTopic": "","closeQos": "0","closePayload": "","closeMsg": {},"willTopic": "","willQos": "0","willPayload": "","willMsg": {},"sessionExpiry": ""}
{"id": "51eee50b4ec9422f","type": "ui_group","name": "dashboardDemo","tab": "29ae4c620f43ee0d","order": 1,"disp": true,"width": "6","collapse": false,"className": ""}
{"id": "29ae4c620f43ee0d","type": "ui_tab","name": "Home","icon": "dashboard","disabled": false,"hidden": false}
{"id": "a506c767a5c1edbd","type": "ui_base","theme": {"name": "theme-light","lightTheme": {"default": "#0094CE","baseColor": "#0094CE","baseFont": "-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen-Sans,Ubuntu,Cantarell,Helvetica Neue,sans-serif","edited": true,"reset": false},"darkTheme": {"default": "#097479","baseColor": "#097479","baseFont": "-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen-Sans,Ubuntu,Cantarell,Helvetica Neue,sans-serif","edited": false},"customTheme": {"name": "Untitled Theme 1","default": "#4B7930","baseColor": "#4B7930","baseFont": "-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen-Sans,Ubuntu,Cantarell,Helvetica Neue,sans-serif"},"themeState": {"base-color": {"default": "#0094CE","value": "#0094CE","edited": false},"page-titlebar-backgroundColor": {"value": "#0094CE","edited": false},"page-backgroundColor": {"value": "#fafafa","edited": false},"page-sidebar-backgroundColor": {"value": "#ffffff","edited": false},"group-textColor": {"value": "#1bbfff","edited": false},"group-borderColor": {"value": "#ffffff","edited": false},"group-backgroundColor": {"value": "#ffffff","edited": false},"widget-textColor": {"value": "#111111","edited": false},"widget-backgroundColor": {"value": "#0094ce","edited": false},"widget-borderColor": {"value": "#ffffff","edited": false},"base-font": {"value": "-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen-Sans,Ubuntu,Cantarell,Helvetica Neue,sans-serif"}},"angularTheme": {"primary": "indigo","accents": "blue","warn": "red","background": "grey","palette": "light"}},"site": {"name": "Node-RED Dashboard","hideToolbar": "false","allowSwipe": "false","lockMenu": "false","allowTempTheme": "true","dateFormat": "DD/MM/YYYY","sizes": {"sx": 48,"sy": 48,"gx": 6,"gy": 6,"cx": 6,"cy": 6,"px": 0,"py": 0}}}
{"id": "248cbbb0.18e794","type": "ui_group","name": "MyGroup","tab": "3f79c420.cfc1bc","order": 1,"disp": true,"width": "6","collapse": false}
{"id": "3f79c420.cfc1bc","type": "ui_tab","name": "Home","icon": "dashboard","disabled": false,"hidden": false}
{"id": "a0954be5.a7f7e8","type": "ui_group","name": "MyInput","tab": "3f79c420.cfc1bc","order": 2,"disp": true,"width": "6","collapse": false}
{"id": "508bd6f8398ab80f","type": "ui_group","name": "OpenWeatherMap","tab": "3f79c420.cfc1bc","order": 3,"disp": true,"width": "6","collapse": false}
{"id": "8824dea1.83e31","type": "websocket-client","path": "ws://localhost:9898/","tls": "","wholemsg": "false"}
{"id": "b40b0437.522ab8","type": "websocket in","z": "f4a4d8eab7935bc8","name": "","server": "","client": "8824dea1.83e31","x": 290,"y": 240,"wires": [["24d481b8.2f71ae"]]}
{"id": "ad931922.6ef1b8","type": "websocket out","z": "f4a4d8eab7935bc8","name": "","server": "","client": "8824dea1.83e31","x": 520,"y": 160,"wires": []}
{"id": "c9dd9e39.c618f","type": "inject","z": "f4a4d8eab7935bc8","name": "","props": [{"p": "payload"},{"p": "topic","vt": "str"}],"repeat": "","crontab": "","once": false,"onceDelay": 0.1,"topic": "","payload": "Hello There","payloadType": "str","x": 280,"y": 160,"wires": [["ad931922.6ef1b8"]]}
{"id": "24d481b8.2f71ae","type": "debug","z": "f4a4d8eab7935bc8","name": "","active": true,"tosidebar": true,"console": false,"tostatus": false,"complete": "payload","targetType": "msg","statusVal": "","statusType": "auto","x": 610,"y": 240,"wires": []}
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