Echarts histogram positive and negative color

 

series: [
    {
      name: 'Evaporation',
      type: 'bar',
      itemStyle:{
        normal: {
            color: function (params) { //根据数值大小设置相关颜色
                if (params.value > 0) {
                    return 'green'
                } else {
                    return 'red'
                }
            }
        }
      },
      data: [
        2.0, -4.9, -7.0, -23.2, 25.6, 76.7, 135.6, 162.2, 32.6, 20.0, 6.4, 3.3
      ]
    }
  ]