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Time axis doesn't support stacking yet.

@pissang Looks like stacking is only supported for category type axes. Is there a simple workaround to make it possible for value type axes?

Link: https://echarts.apache.org/examples/en/editor.html?c=line-stack

Go to the above link, and put the following code. You'll see the weird result.

option = {
  title: {
    text: 'Stacked Line'
  },
  grid: {
    left: '3%',
    right: '4%',
    bottom: '3%',
    containLabel: true
  },
  xAxis: {
    type: 'value',
    data: [0, 1, 2, 3, 4, 5, 6, 7, 8]
  },
  yAxis: {
    type: 'value'
  },
  series: [
    {
      name: 'Email',
      type: 'line',
      stack: 'Total',
      data: [[0, 120], [1, 132], [2, 101], [3, 134], [4, 90], [5, 230], [6, 210]]
    },
    {
      name: 'Union Ads',
      type: 'line',
      stack: 'Total',
      data: [[0, 120], [1, 132], [2, 101], [3, 134], [4, 90], [5, 230], [6, 210]]
    },
  ]
};

@pissang@Ovilia
If I flip x, y axis, it seems to be working.

Link: https://echarts.apache.org/examples/en/editor.html?c=line-stack

Go to the above link, and put the following code.

const data = [[0, 120], [1, 132], [2, 101], [3, 134], [4, 90], [5, 230], [6, 210]];

const newData = data.map(item => [item[1], item[0]]);

option = {
  title: {
    text: 'Stacked Line'
  },
  grid: {
    left: '3%',
    right: '4%',
    bottom: '3%',
    containLabel: true
  },
  yAxis: {
    inverse: true,
    type: 'value',
    data: [0, 1, 2, 3, 4, 5, 6, 7, 8]
  },
  xAxis: {
    type: 'value',
  },
  series: [
    {
      name: 'Email',
      type: 'line',
      stack: 'Total',
      data: newData,
    },
    {
      name: 'Union Ads',
      type: 'line',
      stack: 'Total',
      data: newData,
    },
  ]
};