echarts添加标识线/预警线 markLine

xAxis: {
    type: 'category',
    axisTick: { show: false }, // 取消坐标刻度线
    data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
  },

series: [
    {
      name: 'Email',
      type: 'line',
      stack: 'Total',
      data: [120, -132, 101, -134, 90, -230, 210],
      
      markLine: { // 预警线
        symbol: 'none', 
        data: [{ 
          silent: false, 
          lineStyle: {  // 标识线样式
            type: 'solid',
            color: '#fff'
          }, 
          label: { 
            formatter: '' 
          }, 
          yAxis: 0 
        }]
      }
      
    },
    { ... },
    { ... }
]