百度echarts柱形图头部显示数值

series: [{
  name: "检查量",
  type: "bar",
  data: [25, 20, 40, 20, 50, 10],
  itemStyle: {
    normal: {
      label: {
        show: true,
        position: 'top', 
        textStyle: {
          color: '#f00',
          fontSize: 14
        }
      }
    }
  }
}]