Echarts图例的排列方式

this.option = {
        legend: {
          orient: 'vertical',
          right: 1,
          top: 'center'
        },//设置图例的排列方向
        tooltip: {},
        dataset: {
          dimensions: ['product', '同期', '本期'],
          source: [
            { product: '2022-10', 同期: 400000, 本期: 350000, },
            { product: '2022-11', 同期: 360000, 本期: 360000, },
            { product: '2022-12', 同期: 420000, 本期: 490000, },
            { product: '2023-01', 同期: 450000, 本期: 460000, },
            { product: '2023-02', 同期: 450000, 本期: 440000, },
            { product: '2023-03', 同期: 330000, 本期: 0, }
          ]
        },
        grid: {
          show: false,
          // top:'2%',
          left: '1%',
          right: '3%',
          bottom: '3%',
          containLabel: true
        },
         toolbox: {
          feature: {
            // dataView: { show: true, readOnly: false },
            magicType: { show: true, type: ['bar', 'line'] },
            restore: { show: true },
            saveAsImage: { show: true }
          }
        },
        xAxis: { 
          type: 'category',
          // data: optionName,
          axisTick: {
            show: false,
            alignWithLabel: false,
            lineStyle: {
              type: "dashed"
            }
          },
          axisLine: {
            show: false
          },
       },
        yAxis: {
          type: 'value',
          axisTick: {
            show: false,
          },
          splitLine: {
            show: true,
            lineStyle: {
              type: 'dashed'
            }
          },
          axisLine: { show: false },//y轴刻度线
        },
        // Declare several bar series, each will be mapped
        // to a column of dataset.source by default.
        series: [
          { type: 'bar',
            barWidth: '20%',
            itemStyle: {
              color: '#f49752',
            }//设置柱状图的颜色
          }, 
          { 
            type: 'bar' ,
            barWidth: '20%',
            itemStyle: {
              color: '#0d9cc9',
            }
          }, 
        ]
      }