echarts地图map城市间如何连线

let bjData = [
    [{name:'北京'}, {name:'上海',value:95}],
    [{name:'北京'}, {name:'广州',value:90}]
];

let convert = (data) => {
    let res = [];
    for (var i = 0; i < data.length; i++) {
        var dataItem = data[i];
        var from = geoCoordMap[dataItem[0].name];
        var to = geoCoordMap[dataItem[1].name];
        if (fromCoord && toCoord) {
            res.push({
                fromName: dataItem[0].name,
                toName: dataItem[1].name,
                coords: [from, to]
            });
        }
    }

    return res;
};

series: [

{
    name: '北京',
    type: 'lines',
    zlevel: 1,
    symbol: ['none'],
    symbolSize: 10,
    lineStyle: {
        normal: {
            color: '#f00',
            width: 1,
            opacity: 0.6,
            curveness: 0.2
        }
    },
    data: convert(bjData)
}

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echarts地图map城市间如何连线

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