       shadowColor: 'rgba(0, 0, 0, 0.5)'
                            }
                        },
                        center: [104.2, 36],
                        zoom: 1.4
                    },
                    series : [
                        {
                            name: 'pm2.5',
                            type: 'scatter',
                            coordinateSystem: 'geo',
                            data: convertData(data),
                            symbolSize: function (val) {
    