js k线图kdj的计算方法

根据提供的引用内容，以下是JavaScript中KDJ指标的计算方法：

// 获取KDJ指标
function getKDJ(highs, lows, closes, n = 9, m1 = 3, m2 = 3) {
  let k = [];
  let d = [];
  let j = [];
  let rsv = [];
  let len = highs.length;
  for (let i = 0; i < len; i++) {
    let h = highs[i];
    let l = lows[i];
    let c = closes[i];
    let hh = Math.max(...highs.slice(i - n + 1, i + 1));
    let ll = Math.min(...lows.slice(i - n + 1, i + 1));
    let r = (c - ll) / (hh - ll) * 100;
    rsv.push(r);
    if (i < n - 1) {
      k.push(null);
      d.push(null);
      j.push(null);
    } else if (i === n - 1) {
      let sum = rsv.slice(0, n).reduce((a, b) => a + b);
      let avg = sum / n;
      k.push(avg);
      d.push(avg);
      j.push(3 * avg - 2 * avg);
    } else {
      let kValue = (m1 - 1) / m1 * k[i - 1] + 1 / m1 * r;
      let dValue = (m2 - 1) / m2 * d[i - 1] + 1 / m2 * kValue;
      let jValue = 3 * kValue - 2 * dValue;
      k.push(kValue);
      d.push(dValue);
      j.push(jValue);
    }
  }
  return { k, d, j };
}

其中，`highs`、`lows`和`closes`分别为股票的最高价、最低价和收盘价数组，`n`为KDJ指标中的N值，`m1`和`m2`分别为KDJ指标中的M1和M2值。函数返回一个对象，包含K、D、J三个数组，分别为KDJ指标中的K值、D值和J值。