画的线不能随地图放大缩小echarts lines配置项内容和展示

在全国地图上，加载了京津冀告诉的geojson数据。显示出来了，但是不能随着地图的放大缩小

      var busLines = [];
var uploadedDataURL = "/asset/get/s/data-1607071153577-OIgGAOb1v.json";
$.getJSON(uploadedDataURL, function(da) {
    //为了转换LineString
    var map = {};
    busLines = [].concat(da.features.map(function(feature, idx) {
        var coords = feature.geometry.coordinates;
        return {
            coords: coords,
        }
    }));
    console.log(busLines)
    var option = {
        geo: {
            map: 'china',
            label: {
                emphasis: {
                    show: false
                }
            },
            roam: true,
            itemStyle: {
                normal: {
                    areaColor: 'white',
                    borderColor: '#404a59'
                },
                // emphasis: {
                //   areaColor: ''
                // }
            }
        },
        title: [{
            textStyle: {
                color: "#000",
                fontSize: 18
            },
            subtext: "",
            text: "河北",
            top: "auto",
            subtextStyle: {
                color: "#aaa",
                fontSize: 12
            },
            left: "auto"
        }],
        backgroundColor: "#fff",
        series: [{
            type: 'lines',
            coordinateSystem: 'geo',
            zlevel: 2,
            // polyline: true,
            data: busLines,
            lineStyle: {
                normal: {
                    color: 'green',
                    opacity: 1,
                    width: 1
                }
            },
            polyline: true,
        }],
        //polyline: true,

    };
    myChart.setOption(option);
})