如何在ECharts中使用堆叠图展示数据

// 基于准备好的dom，初始化echarts实例var myChart = echarts.init(document.getElementById('main'));// 指定图表的配置项和数据var option = {  title: {    text: '堆叠区域图'  },  tooltip: {    trigger: 'axis',    axisPointer: {      type: 'cross',      label: {        backgroundColor: '#6a7985'      }    }  },  legend: {    data: ['邮件营销', '联盟广告', '视频广告', '直接访问', '搜索引擎']  },  grid: {    left: '3%',    right: '4%',    bottom: '3%',    containLabel: true  },  toolbox: {    feature: {      saveAsImage: {}    }  },  xAxis: {    type: 'category',    boundaryGap: false,    data: ['周一', '周二', '周三', '周四', '周五', '周六', '周日']  },  yAxis: {    type: 'value'  },  series: [    {      name: '邮件营销',      type: 'line',      stack: '总量',      areaStyle: {},      data: [120, 132, 101, 134, 90, 230, 210]    },    {      name: '联盟广告',      type: 'line',      stack: '总量',      areaStyle: {},      data: [220, 182, 191, 234, 290, 330, 310]    },    {      name: '视频广告',      type: 'line',      stack: '总量',      areaStyle: {},      data: [150, 232, 201, 154, 190, 330, 410]    },    {      name: '直接访问',      type: 'line',      stack: '总量',      areaStyle: {},      data: [320, 332, 301, 334, 390, 330, 320]    },    {      name: '搜索引擎',      type: 'line',      stack: '总量',      label: {        normal: {          show: true,          position: 'top'        }      },      areaStyle: {},      data: [820, 932, 901, 934, 1290, 1330, 1320]    }  ]};// 使用刚指定的配置项和数据显示图表。myChart.setOption(option);