  name: 'line2',
                        type: 'line',
                        stack: 'all',
                        symbolSize: 10,
                        data: data2,
                        itemStyle: itemStyle,
                        connectNulls: true,
                        smooth: true
                    }, {
                        name: 'line3',
                        type: 'line',
                        stack: 'all',
                        symbolSize: 10,
                        data: data3