动态更新echart成交量柱状图，并且不重绘，类似K线的更新方式

    function setoption(data) {
        let dataVolume=volumeChartData;
        var option = {
            title: {
                text: \'成交量\',
//                subtext: \'纯属虚构\'
            },
            tooltip: {
                trigger: \'axis\'
            },
            legend: {
                data:[\'最新成交价\']
            },
//            toolbox: {
//                show: true,
//                feature: {
//                    dataView: {readOnly: false},
//                    restore: {},
//                    saveAsImage: {}
//                }
//            },
            toolbox: {
                show: false,
            },
            grid: {
                left: \'5px\',
                right: \'5px\',
                top: \'10px\',
                bottom: \'10px\',
                containLabel: true
            },
            dataZoom: [{
                textStyle: {
                    color: \'#8392A5\'
                },
//增加这个代码，就能和K线一样的更新数据
                handleIcon: \'M10.7,11.9v-1.3H9.3v1.3c-4.9,0.3-8.8,4.4-8.8,9.4c0,5,3.9,9.1,8.8,9.4v1.3h1.3v-1.3c4.9-0.3,8.8-4.4,8.8-9.4C19.5,16.3,15.6,12.2,10.7,11.9z M13.3,24.4H6.7V23h6.6V24.4z M13.3,19.6H6.7v-1.4h6.6V19.6z\',
                handleSize: \'80%\',
                dataBackground: {
                    areaStyle: {
                        color: \'#8392A5\'
                    },
                    lineStyle: {
                        opacity: 0.8,
                        color: \'#8392A5\'
                    }
                },
                handleStyle: {
                    color: \'#fff\',
                    shadowBlur: 3,
                    shadowColor: \'rgba(0, 0, 0, 0.6)\',
                    shadowOffsetX: 2,
                    shadowOffsetY: 2
                }
            }, {
                type: \'inside\'
            }],
//            dataZoom: [
////                {
////                    show: true,
////                    start: 94,
////                    end: 100
////                },
////                {
////                    type: \'inside\',
////                    start: 94,
////                    end: 100
////                },
////                {
////                    show: true,
////                    yAxisIndex: 0,
////                    filterMode: \'empty\',
////                    width: 30,
////                    height: \'80%\',
////                    showDataShadow: false,
////                    left: \'93%\'
////                }
//            ],
            xAxis: [
                {
                    type: \'category\',
                    boundaryGap: true,
                    data:dataVolume.time
                }
            ],
            yAxis: [
                {
                    type: \'value\',
                    scale: false,
                    name: \'成交量\',
                }
            ],
            series : [
                {
                    name: \'成交量\',
                    type: \'bar\',
                    data:dataVolume.prices
                }
            ]
        };
        return option
}