柱形图平均线

option = {
    color: ['#3398DB'],
    tooltip: {
        trigger: 'axis',
        axisPointer: {            // 坐标轴指示器，坐标轴触发有效
            type: 'shadow'        // 默认为直线，可选为：'line' | 'shadow'
        }
    },
    grid: {
        left: '3%',
        right: '4%',
        bottom: '3%',
        containLabel: true
    },
    xAxis: [
        {
            type: 'category',
            data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'],
            axisTick: {
                alignWithLabel: true
            }
        }
    ],
    yAxis: [
        {
            type: 'value'
        }
    ],
series: [{
    name:'Ping值',
    type:'bar',
    data:[23, 49, 70, 232],
    markLine : {
      symbol : 'none',
      itemStyle : {
        normal : {
          color:'#1e90ff',
          label : {
            show:true
          }
        }
      },
      data : [{type : 'average', name: '平均值'}]
    }
  }]
};