echarts柱状图多柱重叠和多柱堆叠

多柱重叠：barGap:’-100%’（多组数据中只要添加在任意一个组即可）

series: [
        {
            name: '直接访问',
            type: 'bar',

            barGap:'-100%',//重叠效果(可放在任意一个组中)
            data: [320, 332, 301, 334, 390, 330, 320]
        },
        {
            name: '邮件营销',
            type: 'bar',
            data: [120, 132, 101, 134, 90, 230, 210]
        },
        {
            name: '联盟广告',
            type: 'bar',
            data: [220, 182, 191, 234, 290, 330, 310]
        },
        {
            name: '视频广告',
            type: 'bar',
            data: [150, 232, 201, 154, 190, 330, 410]
        }
    ]

多柱堆叠：stack:overlap （overlap 的值任意字符都行，只要保证相同）

series: [
        {
            name: '直接访问',
            type: 'bar',
            stack: 'overlap',//堆叠效果(字符需要统一)
            data: [320, 332, 301, 334, 390, 330, 320]
        },
        {
            name: '邮件营销',
            type: 'bar',
            stack: 'overlap',//堆叠效果(字符需要统一)
            data: [120, 132, 101, 134, 90, 230, 210]
        },
        {
            name: '联盟广告',
            type: 'bar',
            data: [220, 182, 191, 234, 290, 330, 310]
        },
        {
            name: '视频广告',
            type: 'bar',
            stack: 'overlap1',//堆叠效果(字符需要统一)
            data: [150, 232, 201, 154, 190, 330, 410]
        },
        {
            name: '百度',
            type: 'bar',
            stack: 'overlap1',//堆叠效果(字符需要统一)
            data: [620, 732, 701, 734, 1090, 1130, 1120]
        },
    ]