1.echarts 鼠标移入有单位  tooltip

 series: [
          {
            name: "平均值",
            type: "line",
            data: this.avgData,
            tooltip: {
              valueFormatter: function (value) {
                return value + '万元'
              }
            }
          }
        ]

2.echarts 纵坐标有单位；name

yAxis: [
          {
            type: "value",
            name: this.yName,
            splitLine: {
              //显示分割线
              show: true,
            },
          },
        ],

3.echarts 纵坐标刻度有单位 axisLabel

  yAxis: [
          {
            type: "value",
            axisLabel: {
              color: '#B7F1FF',
              formatter: '{value}m³'
            },
          },
        ],