两个图表tooltip联动的时候 中间 会有断层?echarts 柱状配置项内容和展示

tooltip 联动的时候 中间会有断层,视觉效果不好,想问下能否连接这一条直线

配置项如下
      let xs = ['2013', '2014', '2015', '2016', '2017', '2018', '2019'];
option = {
    axisPointer: {
        link: {
            xAxisIndex: 'all'
        },
        label: {
            backgroundColor: '#777'
        }
    },
    title: [{
      text: '接单量(万平方米)',
      left: 60,
      top: '2%',
      textStyle: {
        color: '#000',
        fontSize: 14,
        fontWeight: 'normal'
      }
    }, {
      subtext: '总GMV(万元)',
      subtextStyle: {
        color: '#000',
        fontSize: 14,
        fontWeight: 'normal',
      },
      left: 60,
      top: '48%',
    }],
    tooltip: {
        trigger: 'axis',
        axisPointer: {
            type: 'line',
            lineStyle: {
                type: 'dashed'
            }
        },
        backgroundColor: 'rgba(245, 245, 245, 0.8)',
        borderWidth: 1,
        borderColor: '#ccc',
        padding: 10,
        textStyle: {
            color: '#000'
        },
        // position: function(pos, params, el, elRect, size) {
        //     var obj = {
        //         top: 10
        //     };
        //     obj[['left', 'right'][+(pos[0] < size.viewSize[0] / 2)]] = 30;
        //     return obj;
        // }
    },
    color: ['#7AF6FC', '#FEC721', '#0AE7CC'],
    grid: [{
            x: '5%',
            y1: '5%',
            height: '35%',
            left: '10%',
            show: true
        },
        {
            x: '5%',
            y2: '5%',
            height: '40%',
            left: '10%',
            show: true
            //bottom: '5%'
        }
    ],
    xAxis: [{
            show: false, //隐藏了x轴
            type: 'category',
            gridIndex: 0, //对应前面grid的索引位置(第一个)
            axisTick: {
                show: false
            },
            axisLabel: {
                //interval:showNum,  //x轴显示的数量,我这里是动态算的
            },
            data: xs,
        },
        {
            type: 'category',
            gridIndex: 1, //对应前面grid的索引位置(第二个)
            axisTick: {
                show: false
            },
            axisLabel: {
                //interval:showNum,
            },
            data: xs,
        }
    ],
    //y轴,不管有几个x轴,几个y轴,或者图,只要找到他对应的grid图的序号索引就可以精准匹配

    yAxis: [{
            type: 'value',
            gridIndex: 1, //对应前面grid的索引位置(第二个)
            splitLine: {
                show: true
            },
            offset: 10,
            nameTextStyle: {
                padding: 25,
                align: 'center'
            },
            position: 'left',
            axisLine: {
                show: false,
            },
            axisTick: {
                show: false,
            },
            axisLabel: {
                formatter: '{value}'
            }
        },
        {
            type: 'value',
            gridIndex: 0,
            nameTextStyle: {
                padding: 40
            },
            offset: 10,
            position: 'left',
            nameLocation: 'middle',
            splitLine: {
                show: true
            },
            axisLine: {
                show: false,
            },
            axisTick: {
                show: false,
            },
            axisLabel: {
                formatter: '{value}',
                textStyle: {
                    fontSize: 12 //y轴坐标轴上的字体大小
                }

            },
        },
    ],
    series: [{
            name: '接单量',
            type: "line",
            xAxisIndex: 0,
            yAxisIndex: 1,

            data: [28, 27, 40, 72, 100, 123, 247]
        },
        {
            type: 'bar',
            stack: '总量',
            barWidth: 30,
            xAxisIndex: 1,
            yAxisIndex: 0,
            data: [28, 27, 40, 72, 100, 123, 247]
        },
        {
            type: 'bar',
            stack: '总量',
            barWidth: 30,
            xAxisIndex: 1,
            yAxisIndex: 0,
            data: [20, 27, 60, 52, 60, 103, 147]
        }
    ]
};
    
截图如下