写图表时，Y轴的数值过大，不太可能直接展示，这时候就得简写了，如图：

红框圈起来的数值表示如下：

1K	1000
1M	1000,000
1B	1000,000,000
1KB	1000,000,000,000

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('')}`;
}

使用：

Y轴yAxis的属性，数值格式化，对应的大数值就会转换为简写，图表看起来美观，简明一些。