echarts柱狀圖多柱重疊和多柱堆疊

多柱重疊：barGap:’-100%’（多組數據中只要添加在任意一個組即可）

series: [
        {
            name: '直接訪問',
            type: 'bar',

            barGap:'-100%',//重疊效果(可放在任意一個組中)
            data: [320, 332, 301, 334, 390, 330, 320]
        },
        {
            name: '郵件營銷',
            type: 'bar',
            data: [120, 132, 101, 134, 90, 230, 210]
        },
        {
            name: '聯盟廣告',
            type: 'bar',
            data: [220, 182, 191, 234, 290, 330, 310]
        },
        {
            name: '視頻廣告',
            type: 'bar',
            data: [150, 232, 201, 154, 190, 330, 410]
        }
    ]

多柱堆疊：stack:overlap （overlap 的值任意字符都行，只要保證相同）

series: [
        {
            name: '直接訪問',
            type: 'bar',
            stack: 'overlap',//堆疊效果(字符需要統一)
            data: [320, 332, 301, 334, 390, 330, 320]
        },
        {
            name: '郵件營銷',
            type: 'bar',
            stack: 'overlap',//堆疊效果(字符需要統一)
            data: [120, 132, 101, 134, 90, 230, 210]
        },
        {
            name: '聯盟廣告',
            type: 'bar',
            data: [220, 182, 191, 234, 290, 330, 310]
        },
        {
            name: '視頻廣告',
            type: 'bar',
            stack: 'overlap1',//堆疊效果(字符需要統一)
            data: [150, 232, 201, 154, 190, 330, 410]
        },
        {
            name: '百度',
            type: 'bar',
            stack: 'overlap1',//堆疊效果(字符需要統一)
            data: [620, 732, 701, 734, 1090, 1130, 1120]
        },
    ]