High-Frequency KDJ

Query intraday minute-bar KDJ (Stochastic Oscillator) for A-share securities via the market data service.RSV = (Close - Low_N) / (High_N - Low_N) * 100; K = SMA(RSV, M1); D = SMA(K, M2); J = 3K - 2D.Default: N=9, M1=3, M2=3.line selects the output series: K (fast), D (slow), or J (divergence).codes: comma-separated security codes (e.g. '600000.SH,000001.SZ').interval: minute bar width — 1/3/5/10/15/30/60.starttime/endtime: 'YYYY-MM-DD HH: MM: SS' intraday range.