Echart line chart: different colors are displayed when the names of multiple line charts are the same

echart Broken line diagram , When multiple line graphs name Same , Same color .

option = {
    
  xAxis: {
    
    type: 'category',
    data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
  },
  tooltip: {
    
    trigger: 'axis'
  },
  yAxis: {
    
    type: 'value'
  },
  series: [
    {
    
      data: [150, 230, 224, 218, 135, 147, 260],
      type: 'line',
      name: 'heeki'
    },
    {
    
      data: [110, 210, 224, 18, 135, 17, 260],
      type: 'line',
      name: 'heeki'
    }
  ]
};

To set different colors , Need to be in series Set different colors separately in

option = {
    
  xAxis: {
    
    type: 'category',
    data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
  },
  tooltip: {
    
    trigger: 'axis'
  },
  yAxis: {
    
    type: 'value'
  },
  series: [
    {
    
      data: [150, 230, 224, 218, 135, 147, 260],
      type: 'line',
      name: 'heeki',
      itemStyle: {
    
        normal: {
    
          color: 'red'
        }
      }
    },
    {
    
      data: [110, 210, 224, 18, 135, 17, 260],
      type: 'line',
      name: 'heeki',
      itemStyle: {
    
        normal: {
    
          color: 'yellow'
        }
      }
    }
  ]
};