<canvas
 style="width: 400px; height: 500px;"
 canvas-id="yueEle"
 binderror="canvasIdErrorCallback"
></canvas>

getMothElectro:function(){
  var windowWidth = 320;
  try {
   var res = wx.getSystemInfoSync();
   windowWidth = res.windowWidth;
  } catch (e) {
   console.error('getSystemInfoSync failed!');
  }
  yuelineChart = new wxCharts({ //当月用电折线图配置
   canvasId: 'yueEle',
   type: 'line',
   categories: ['1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12', '13', '14', '15', '16', '17', '18', '19', '20', '21', '22', '23', '24', '25', '26', '27', '28', '29', '30', '31'], //categories X轴
   animation: true,
   // background: '#f5f5f5',
   series: [{
    name: '总用电量',
    //data: yuesimulationData.data,
    data: [1, 6, 9, 1, 0, 2, 9, 2, 8, 6, 0, 9, 8, 0, 3, 7, 3, 9, 3, 8, 9, 5, 4, 1, 5, 8, 2, 4, 9, 8, 7],
    format: function (val, name) {
     return val.toFixed(2) + 'kWh';
    }
   }, {
    name: '电池供电量',
    data: [0, 6, 2, 2, 7, 6, 2, 5, 8, 1, 8, 4, 0, 9, 7, 2, 5, 2, 8, 2, 5, 2, 9, 4, 4, 9, 8, 5, 5, 5, 6],
    format: function (val, name) {
     return val.toFixed(2) + 'kWh';
    }
   },
   {
    name: '光伏供电量',
    data: [6, 4, 9, 7, 1, 4, 5, 1, 1, 8, 8, 6, 6, 2, 2, 2, 0, 5, 5, 8, 8, 8, 8, 9, 0, 4, 6, 9, 2, 1, 6],
    format: function (val, name) {
     return val.toFixed(2) + 'kWh';
    }
   },
   {
    name: '市电供电量',
    data: [0, 4, 3, 3, 1, 7, 7, 7, 9, 9, 3, 3, 0, 0, 5, 6, 0, 4, 1, 2, 0, 1, 3, 9, 2, 5, 1, 8, 3, 4, 2],
    format: function (val, name) {
     return val.toFixed(2) + 'kWh';
    }
   }],
   xAxis: {
    disableGrid: true
   },
   yAxis: {
    title: '当月用电(kWh)',
    format: function (val) {
     return val.toFixed(2);
    },
    max: 20,
    min: 0
   },
   width: windowWidth,
   height: 200,
   dataLabel: false,
   dataPointShape: true,
   extra: {
    lineStyle: 'curve'
   }
  });
 }

yueTouchHandler: function (e) { //当月用电触摸显示
  console.log(daylineChart.getCurrentDataIndex(e));
  yuelineChart.showToolTip(e, { //showToolTip图表中展示数据详细内容
   background: '#7cb5ec',
   format: function (item, category) {
    return category + '日 ' + item.name + ':' + item.data
   }
  });
 },