效果：

配置项：

1、 stack: 'total', 同个类目轴上系列配置相同的 stack 值可以堆叠放置，stack 只支持堆叠于 ‘value’ 和 ‘log’ 类型的类目轴上

2、指定柱子颜色：itemStyle: { color:'pink' },

代码：

option = {
  tooltip: {
    trigger: 'axis',
    axisPointer: {
      // Use axis to trigger tooltip
      type: 'shadow' // 'shadow' as default; can also be 'line' or 'shadow'
    }
  },
  legend: {},
  grid: {
    left: '3%',
    right: '4%',
    bottom: '3%',
    containLabel: true
  },
  xAxis: {
    type: 'category',
    data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']

  },
  yAxis: {
    type: 'value',
  },
  series: [
    {
      name: 'Direct',
      type: 'bar',
      stack: 'total',
      label: {
        show: true
      },
      emphasis: {
        focus: 'series'
      },
      itemStyle: {
          color:'pink'
      },
      data: [320, 302, 301, 334, 390, 330, 320]
    },
    {
      name: 'Affiliate Ad',
      type: 'bar',
      stack: 'total',
      label: {
        show: true
      },
      emphasis: {
        focus: 'series'
      },
      data: [220, 182, 191, 234, 290, 330, 310]
    },
    {
      name: 'Search Engine',
      type: 'bar',
      stack: 'total',
      label: {
        show: true
      },
      emphasis: {
        focus: 'series'
      },
      data: [820, 832, 901, 934, 1290, 1330, 1320]
    }
  ]
};