解決echarts地圖geoJson報錯問題（“echarts.min.js:45 Uncaught Error: Invalid geoJson format Cannot read prope”）

背景

專案中用echarts繪制地圖，由于網上鄉鎮級別行政邊界地圖賊少，所以需要用到bigMap+geojson.io去繪制自定義地圖，詳情請看解決如何整理出鄉鎮級的地圖json，以此使用echarts繪制出鄉鎮級的資料
但是由于生成的地圖里有一個區域為兩塊不連續的地圖塊，所以生成的geoJson中此區域的geometry.type===GeometryCollection.
然而 echarts 中對于此型別沒有做處理，詳情見原始碼
echarts\lib\coord\geo\parseGeoJson.js
第133行左右

這段代碼的意思是決議geoJson

解決方法

需要修改如下函式：
echarts 源代碼 大約121行

function _default(geoJson, nameProperty) {}

直接復制粘貼：

function _default(geoJson, nameProperty) {
    decode(geoJson);
    return zrUtil.map(
        zrUtil.filter(geoJson.features, function(featureObj) {
            if (featureObj.geometry.geometries) {
                let geometry = featureObj.geometry.geometries.map(i => {
                    return i.coordinates;
                });
                let { type, properties, ...params } = featureObj;
                return { type, properties, geometry };
            }
            // Output of mapshaper may have geometry null
            return (
                featureObj.geometry &&
                featureObj.properties &&
                featureObj.geometry.coordinates &&
                featureObj.geometry.coordinates.length > 0
            );
        }),
        function(featureObj) {
            var properties = featureObj.properties;
            var geo = featureObj.geometry;
            var coordinates = geo.coordinates;
            var geometries = [];

            if (geo.type === "GeometryCollection") {
                let geometry = {
                    type: "Polygon"
                };
                let coordinatesArr = featureObj.geometry.geometries.map(i => {
                    return i.coordinates;
                });
                geometry.coordinates = coordinatesArr;
                console.log(coordinatesArr, "coordinatesArr");
                coordinatesArr.forEach(i => {
                    geometries.push({
                        type: "polygon",
                        // According to the GeoJSON specification.
                        // First must be exterior, and the rest are all interior(holes).
                        exterior: i[0],
                        interiors: i.slice(1)
                    });
                });
            }
            if (geo.type === "Polygon") {
                console.log("coordinatesPolygon", coordinates);
                geometries.push({
                    type: "polygon",
                    // According to the GeoJSON specification.
                    // First must be exterior, and the rest are all interior(holes).
                    exterior: coordinates[0],
                    interiors: coordinates.slice(1)
                });
            }

            if (geo.type === "MultiPolygon") {
                zrUtil.each(coordinates, function(item) {
                    if (item[0]) {
                        geometries.push({
                            type: "polygon",
                            exterior: item[0],
                            interiors: item.slice(1)
                        });
                    }
                });
            }
            console.log(
                properties[nameProperty || "name"],
                geometries,
                properties.cp,
                "asdfasdfasdf"
            );
            var region = new Region(
                properties[nameProperty || "name"],
                geometries,
                properties.cp
            );
            region.properties = properties;
            return region;
        }
    );
}

ps: 去git上看echarts之前的issues，有類似問題，修改前可以去該issues參觀一下