使用Node-RED爬虫并基于ECharts可视化某楼盘的销售情况

以下是一个简化的Node-RED流定义，用于从一个API获取数据，并通过ECharts在网页上显示结果。

[
    {
        "id": "node-red-start",
        "type": "tab",
        "label": "Start",
        "disabled": false,
        "info": "",
        "env": []
    },
    {
        "id": "1a9d8e1e.8c6158",
        "type": "ui_group",
        "name": "Estate Sales Dashboard",
        "tab": "node-red-start",
        "disp": true,
        "width": "6",
        "collapse": false,
        "libs": [
            "core",
            "dashboard"
        ]
    },
    {
        "id": "2256e46e.8c615",
        "type": "ui_chart",
        "name": "",
        "tab": "node-red-start",
        "disp": true,
        "width": "6",
        "height": "4",
        "format": "timeseries",
        "template": "{\"title\":{\"text\":\"Estate Sales\"},\"tooltip\":{\"trigger\":\"axis\"},\"legend\":{\"data\":[\"Sales\"]},\"xAxis\":{\"type\":\"category\",\"boundaryGap\":false,\"data\":[]},\"yAxis\":{\"type\":\"value\"},\"series\":[{\"name\":\"Sales\",\"type\":\"line\",\"data\":[]}]}",
        "xaxis": {
            "label": "Date",
            "scale": "linear"
        },
        "yaxis": {
            "label": "Sales",
            "scale": "linear",
            "min": 0
        },
        "src": "msg.payload",
        "wires": []
    },
    {
        "id": "3edc618e.8c6158",
        "type": "ui_base",
        "name": "",
        "tab": "node-red-start",
        "disp": true,
        "width": "6",
        "height": "6",
        "theme": {
            "name": "theme-light",
            "lightTheme": {
                "default": "#ffffff",
                "darker": "#cccccc",
                "text": "#000000",
                "dashboard": {
                    "background": "#ffffff",
                    "grid": "#dddddd",
                    "canvas": "#e9e9e9",
                    "border": "#aaaaaa",
                    "text": "#000000"
                }
            },
            "darkTheme": {
                "default": "#222222",
                "darker": "#555555",
                "text": "#ffffff",
                "dashboard": {
                    "background": "#222222",
                    "grid": "#444444",
                    "canvas": "#666666",
                    "border": "#888888",
                    "text": "#ffffff"
                }
            }
        },
        "wires": [
            [
                "2256e46