实现ECharts双Y轴左右刻度线一致

  
 


 data() {
    return {
      carStream: [], //车流
      date: [], //日期
      income: [], //收入
    }
  },
mounted() {
    this. getDynamicData()
},
methods: {
     //近30天收入和车流
    getDynamicData() {
      getAction('').then((res) => {
        if (res.success) {
          this.carStream = res.result.carStream
          this.date = res.result.date
          this.income = res.result.income
          for (let i = 0; i < this.date.length; i++) {
            this.income[i] = this.income[i] * 0.01
          }
          this.drawImg()
        }
      })
    },
  //绘图
    drawImg() {
      let myChart = echarts.init(document.getElementById('main'))
      // 指定图表的配置项和数据
      let option = {
        tooltip: {
          trigger: 'axis',
        },
        legend: {
          data: ['收入(元)', '车流(辆)'],
        },
        xAxis: [
          {
            type: 'category',
            data: this.date,
            axisPointer: {
              type: 'shadow',
            },
             axisTick: {
               show: false
             }
          },
        ],
        yAxis: [
          {
            type: 'value',
            name: '收入(元)',
            splitNumber: 5,
            max: this.calMax(this.income),
            min: this.calMin(this.income),
            interval: (this.calMax(this.income) - this.calMin(this.income)) / 5,
          },
          {
            type: 'value',
            name: '车流(辆)',
            splitNumber: 5,
            max: this.calMax(this.carStream),
            min: this.calMin(this.carStream),
            interval: (this.calMax(this.carStream) - this.calMin(this.carStream)) / 5,
          },
        ],
        series: [
          {
            name: '收入(元)',
            type: 'line',
            data: this.income,
          },
          {
            name: '车流(辆)',
            type: 'line',
            yAxisIndex: 1,
            data: this.carStream,
          },
        ],
      }
      // 使用刚指定的配置项和数据显示图表。
      myChart.setOption(option)
    },
    //求最大值
    calMax(arr) {
      var max = arr[0]
      var len = arr.length
      for (var i = 1; i < len; i++) {
        if (arr[i] > max) {
          max = arr[i]
        }
      }
      let maxint = Math.ceil(max / 9.5) //不让最高的值超过最上面的刻度
      let maxval = maxint * 10 //让显示的刻度是整数
      console.log(maxval,'max')
      return maxval
    },
    //求最小值
    calMin(arr) {
      var min = arr[0]
      var len = arr.length
      for (var i = 1; i < len; i++) {
        if (arr[i] < min) {
          min = arr[i]
        }
      }
      let minint = Math.floor(min / 10)
      let minval = minint * 10 //让显示的刻度是整数
       console.log(minval,'max')
      return minval
    },
}

 splitNumber 、max、min、 interval