如何使得bar chart从上方开始echarts 柱状配置项内容和展示

这里series[0]应该是从yAxis[1]的上届向下的柱状图。

      option = {
    title: {
        show: true,
        trigger: 'item'
    },
    tooltip: {
        trigger: 'none'
    },
    grid: [{
        height: 160,
    }, {
        top: 260,
    }],
    xAxis: [{
        gridIndex: 1,
        data: ['OURS', 'ICBC', 'HSBC', 'DBS', 'BOC', 'INB', 'CMB', 'SPOB'],
        splitLine: true,
        position: 'top',
        interval: 1
    }, {
        gridIndex: 1,
        min: 0,
        max: 100,
        show: false
    }, {
        gridIndex: 0,
        data: ['OURS', 'ICBC', 'HSBC', 'DBS', 'BOC', 'INB', 'CMB', 'SPOB'],
        splitLine: true,
        position: 'bottom',
        axisLabel: {
            show: false
        }
    }, {
        gridIndex: 0,
        min: 0,
        max: 100,
        show: false
    }],
    yAxis: [{
        gridIndex: 1,
        max: 9390,
        min: 9350,
        interval: 1,
        splitLine: {
            lineStyle: {
                opacity: 0.2
            }
        }
    }, {
        name: 'offer',
        gridIndex: 1,
        max: 0,
        min: 40,
        inverse: true,
        show: false
    }, {
        name: 'spread',
        gridIndex: 0,
        //show: false,
        max: 0,
        min: 20
    }],
    series: [{
        name: 'offer',
        type: 'bar',
        yAxisIndex: 1,
        xAxisIndex: 0,
        barGap: '-100%',
        //barWidth: '80%',
        data: [
            9390 - 9373,
            9390 - 9374,
            9390 - 9378,
            9390 - 9378,
            9390 - 9372,
            9390 - 9371,
            9390 - 9383,
            9390 - 9382
        ],
        tooltip: {
            formatter: ''
        },
        itemStyle: {
            normal: {
                color: '#338833',
                opacity: 0.9

            }
        },
        z: 3
    }, {
        name: 'bid',
        type: 'bar',
        yAxisIndex: 0,
        xAxisIndex: 0,
        data: [9366, 9368, 9367, 9362, 9360, 9360, 9369, 9369],
        //barWidth: '80%',
        itemStyle: {
            normal: {
                color: '#883333',
                opacity: 0.9
            }
        },
        z: 3
    }, {
        name: 'mybid',
        type: 'line',
        yAxisIndex: 0,
        xAxisIndex: 1,
        data: [
            [0, 9366],
            [100, 9366]
        ],
        itemStyle: {
            normal: {
                opacity: 0
            }
        },
        tooltip: {
            trigger: 'none'
        },
        stack: 'band',
        lineStyle: {
            normal: {
                opacity: 0.1
            }
        }
    }, {
        name: 'myoffer',
        type: 'line',
        yAxisIndex: 0,
        xAxisIndex: 1,
        data: [
            [0, 7],
            [100, 7]
        ],
        stack: 'band',
        lineStyle: {
            normal: {
                opacity: 0.1
            }
        },
        itemStyle: {
            normal: {
                opacity: 0
            }
        },
        tooltip: {
            trigger: 'none'
        },
        areaStyle: {
            normal: {
                color: '#fff',
                opacity: 0.3
            }
        },
        z: 4
    },{
        name: 'spread',
        type: 'bar',
        yAxisIndex:2,
        xAxisIndex:2,
        data: [
            9373-9366,
            9374-9368,
            9378-9367,
            9378-9362,
            9372-9360,
            9371-9360,
            9383-9369,
            9382-9369,
        ]
    }, {
        name: 'mySpread',
        type: 'line',
        yAxisIndex: 2,
        xAxisIndex: 3,
        data: [
            [0, 7],
            [100, 7]
        ],
        lineStyle: {
            normal: {
                opacity: 0.2
            }
        },
        itemStyle: {
            normal: {
                opacity: 1
            }
        },
        tooltip: {
            trigger: 'none'
        },
        areaStyle: {
            normal: {
                color: '#fff',
                opacity: 0.3
            }
        },
        z: 2
    }]
};