场景

Node-RED简介与Windows上安装、启动和运行示例：

Node-RED简介与Windows上安装、启动和运行示例_霸道流氓气质的博客-CSDN博客

Node-RED怎样导出导入流程为json文件：

Node-RED怎样导出导入流程为json文件_霸道流氓气质的博客-CSDN博客

Node-RED安装图形化节点dashboard实现订阅mqtt主题并在仪表盘中显示温度：

Node-RED安装图形化节点dashboard实现订阅mqtt主题并在仪表盘中显示温度_霸道流氓气质的博客-CSDN博客

在上面的基础上怎样使用node-random随机数节点，并构造出变化的模拟数据

在折线图中显示。

注：

博客：
霸道流氓气质的博客_CSDN博客-C#,架构之路,SpringBoot领域博主
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实现

1、菜单-节点管理-搜索node-red-node-random随机数节点，来产生随机数。

然后就可以在面板中找到random组件

编辑random节点从1到100

2、拖拽chart组件并编辑折线图属性

设置inject节点每隔两秒执行

3、json数据

[
    {
        "id": "bd92edab3c781ab4",
        "type": "inject",
        "z": "f4a4d8eab7935bc8",
        "name": "",
        "props": [
            {
                "p": "payload"
            },
            {
                "p": "topic",
                "vt": "str"
            }
        ],
        "repeat": "2",
        "crontab": "",
        "once": false,
        "onceDelay": 0.1,
        "topic": "",
        "payloadType": "date",
        "x": 220,
        "y": 180,
        "wires": [
            [
                "97002e0a588d91d2"
            ]
        ]
    },
    {
        "id": "3ecb265fb81d22fc",
        "type": "debug",
        "z": "f4a4d8eab7935bc8",
        "name": "",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "false",
        "x": 590,
        "y": 180,
        "wires": []
    },
    {
        "id": "97002e0a588d91d2",
        "type": "random",
        "z": "f4a4d8eab7935bc8",
        "name": "",
        "low": 1,
        "high": "100",
        "inte": "true",
        "property": "payload",
        "x": 400,
        "y": 180,
        "wires": [
            [
                "3ecb265fb81d22fc",
                "6a376c712f33f004"
            ]
        ]
    },
    {
        "id": "6a376c712f33f004",
        "type": "ui_chart",
        "z": "f4a4d8eab7935bc8",
        "name": "",
        "group": "248cbbb0.18e794",
        "order": 1,
        "width": 0,
        "height": 0,
        "label": "折线图",
        "chartType": "line",
        "legend": "false",
        "xformat": "HH:mm:ss",
        "interpolate": "linear",
        "nodata": "",
        "dot": false,
        "ymin": "",
        "ymax": "",
        "removeOlder": 1,
        "removeOlderPoints": "20",
        "removeOlderUnit": "3600",
        "cutout": 0,
        "useOneColor": false,
        "useUTC": false,
        "colors": [
            "#1f77b4",
            "#aec7e8",
            "#ff7f0e",
            "#2ca02c",
            "#98df8a",
            "#d62728",
            "#ff9896",
            "#9467bd",
            "#c5b0d5"
        ],
        "outputs": 1,
        "useDifferentColor": false,
        "className": "",
        "x": 570,
        "y": 260,
        "wires": [
            []
        ]
    },
    {
        "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
    }
]

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