            var chart = echarts.init(document.getElementById('rainfall'));

                var option = {
                    tooltip: {
                        trigger: 'axis',
                    },
                    legend: {
                        data: ['降水量', '流量']
                    },
                    grid: [
                        {
                            show: true,
                            borderWidth: 0,
                            right: '15%',
                       