注释以下代码option = { title: { text: 'Stacked line'//图表名称 }, tooltip: { trigger: 'axis' }, legend: { data: ['Email', 'Union Ads', 'Video Ads', 'Direct', 'Search Engine'] },//折线代表的类型名 grid: { left: '3%', right: '4%', bottom: '3%', containLabel: true },//控制行的属性，如行高、比例等。布局中不同行的大小和位置，以实现更灵活和美观的界面。 toolbox: { feature: { saveAsImage: {} } }, xAxis: { type: 'category', boundaryGap: false, data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'] }, yAxis: { type: 'value' }, series: [ { name: 'Email', type: 'line', stack: 'Total', data: [120, 132, 101, 134, 90, 230, 210] }, { name: 'Union Ads', type: 'line', stack: 'Total', data: [220, 182, 191, 234, 290, 330, 310] }, { name: 'Video Ads', type: 'line', stack: 'Total', data: [150, 232, 201, 154, 190, 330, 410] }, { name: 'Direct', type: 'line', stack: 'Total', data: [320, 332, 301, 334, 390, 330, 320] }, { name: 'Search Engine', type: 'line', stack: 'Total', data: [820, 932, 901, 934, 1290, 1330, 1320] } ] };

以下是对给定代码的注释：

option = {
  title: {
    text: 'Stacked line' // 图表名称
  },
  tooltip: {
    trigger: 'axis'
  },
  legend: {
    data: ['Email', 'Union Ads', 'Video Ads', 'Direct', 'Search Engine']
  }, // 折线代表的类型名
  grid: {
    left: '3%',
    right: '4%',
    bottom: '3%',
    containLabel: true
  }, // 控制行的属性，如行高、比例等。布局中不同行的大小和位置，以实现更灵活和美观的界面。
  toolbox: {
    feature: {
      saveAsImage: {}
    }
  },
  xAxis: {
    type: 'category',
    boundaryGap: false,
    data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
  },
  yAxis: {
    type: 'value'
  },
  series: [
    {
      name: 'Email',
      type: 'line',
      stack: 'Total',
      data: [120, 132, 101, 134, 90, 230, 210]
    },
    {
      name: 'Union Ads',
      type: 'line',
      stack: 'Total',
      data: [220, 182, 191, 234, 290, 330, 310]
    },
    {
      name: 'Video Ads',
      type: 'line',
      stack: 'Total',
      data: [150, 232, 201, 154, 190, 330, 410]
    },
    {
      name: 'Direct',
      type: 'line',
      stack: 'Total',
      data: [320, 332, 301, 334, 390, 330, 320]
    },
    {
      name: 'Search Engine',
      type: 'line',
      stack: 'Total',
      data: [820, 932, 901, 934, 1290, 1330, 1320]
    }
  ]
};

这段代码是一个配置选项对象（option），用于设置一个堆叠折线图的样式和数据。每个属性都有相应的注释，以说明其作用和含义。