ECharts Y轴大数值格式化与单位简写实现

 yAxis: {
   type: 'value',

   // Y轴轴线
   axisLine: { show: false }, 

   // 刻度线
   axisTick: { show: false },

   // 轴刻度值
   axisLabel: {
     interval: 0, //坐标轴值与坐标轴间距

     rotate: 0, //旋转角度
    
     // 值格式化 (toBMK函数 处理 Y轴数字值)
     formatter(val) {
       return `${toBMK(val)}${option.series[0].data[0].indexOf('%') > -1 ? '%' : ''}`;
     },
   },
 }

export function toBMK(value) {
  const vblValue = Math.abs(value);
  const newValue = ['', '', ''];
  let fr = 1000;
  let num = 3;
  while (vblValue / fr >= 1) {
    fr *= 10;
    num += 1;
  }
  if (num <= 4) {
    newValue[1] = 'K';
    newValue[0] = vblValue / 1000 >= 10 
    ? `${parseInt(vblValue / 1000, 10)}` 
    : (vblValue / 1000).toFixed(1);

  } else if (num <= 7) {
    const text1 = parseInt(num - 3, 10) / 3 > 1 ? 'M' : 'K';
    const fm = text1 === 'K' ? 1000 : 1000000;
    newValue[1] = text1;
    newValue[0] = `${vblValue / fm}`;
  } else {
    let text1 = (num - 6) / 3 > 1 ? 'B' : 'M';
    text1 = (num - 9) / 3 > 1 ? 'KB' : text1;
    let fm = 1;
    if (text1 === 'M') {
      fm = 1000000;
    } else if (text1 === 'B') {
      fm = 1000000000;
    } else if (text1 === 'KB') {
      fm = 1000000000000;
    }
    newValue[1] = text1;
    newValue[0] = `${parseInt(vblValue / fm, 10)}`;
  }
  if (vblValue < 1000) {
    newValue[1] = '';
    newValue[0] = `${vblValue}`;
  }
  return `${value < 0 ? '-' : ''}${newValue.join('')}`;
}