//柱狀圖
    var barGragh = document.getElementById('barGragh');
    var barChart = echarts.init(barGragh);
    var barChartoption = {
        tooltip: {
            trigger: 'axis'
        },
        legend: {
            data: ['上週同比', '今日整點'],
            /* y : 'bottom' */
        },
        toolbox: {
            show: false
 
,
            feature: {
                mark: {show: true},
                dataView: {show: true, readOnly: false},
                magicType: {show: true, type: ['line', 'bar']},
                restore: {show: true},
                saveAsImage: {show: true}
            }
        },
        color : ['#ff7f50'
 
,'#87cefa', '#61a0a8', '#d48265', '#91c7ae','#749f83',  '#ca8622', '#bda29a','#6e7074', '#546570', '#c4ccd3'],
        calculable: false,
        grid: {
            left: '0%',
            right: '0%',
            bottom: '5%',
            containLabel: true
        },
        xAxis: [
            {
                type
 
: 'category',
                data: []
            }
        ],
        yAxis: [
            {
                type: 'value',
                name: 'GMV'
            }
        ],
        series: [
            {
                name: '上週同比',
                type: 'bar',
                barMaxWidth: '100',
                data: [],
                markPoint: {
                    data: [
                        {type: 'max', name: '最大值'},
                        {type: 'min', name: '最小值'}
                    ]
                },
                markLine: {
                    data: [
                        {type: 'average', name: '平均值'}
                    ]
                }
            },
            {
                name: '今日整點',
                type: 'bar',
                barMaxWidth: '100',
                data: [],
                markPoint: {
                    data: [
                        {type: 'max', name: '最大值'},
                        {type: 'min', name: '最小值'}
                    ]
                },
                markLine: {
                    data: [
                        {type: 'average', name: '平均值'}
                    ]
                }
            }
        ]
    };
    barChart.setOption(barChartoption);

關鍵程式碼：

barMaxWidth: '100',

實現效果