如何在TradingView随机震荡指标上添加超买超卖信号标记？

以下是添加了信号标记的完整Pine Script代码，满足需求：当%D线下穿80时显示红色圆圈，上穿20时显示绿色圆圈：

//@version=5
indicator(title="Stochastic", shorttitle="Stoch", format=format.price, precision=2, timeframe="", timeframe_gaps=true)
periodK = input.int(14, title="%K Length", minval=1)
smoothK = input.int(1, title="%K Smoothing", minval=1)
periodD = input.int(3, title="%D Smoothing", minval=1)
k = ta.sma(ta.stoch(close, high, low, periodK), smoothK)
d = ta.sma(k, periodD)

// 信号条件判断
sell_signal = ta.crossunder(d, 80)
buy_signal = ta.crossover(d, 20)

plot(k, title="%K", color=#2962FF)
plot(d, title="%D", color=#FF6D00)
h0 = hline(80, "Upper Band", color=#787B86)
hline(50, "Middle Band", color=color.new(#787B86, 50))
h1 = hline(20, "Lower Band", color=#787B86)
fill(h0, h1, color=color.rgb(33, 150, 243, 90), title="Background")

// 绘制信号标记
plotshape(sell_signal, title="Sell Signal", location=location.belowbar, color=color.red, style=shape.circle, size=size.small)
plotshape(buy_signal, title="Buy Signal", location=location.abovebar, color=color.green, style=shape.circle, size=size.small)

关键修改说明： #

• 新增sell_signal变量，通过ta.crossunder(d, 80)检测%D线从80上方下穿至下方的动作
• 新增buy_signal变量，通过ta.crossover(d, 20)检测%D线从20下方上穿至上方的动作
• 使用plotshape()函数绘制圆形标记：
  • 卖出信号（下穿80）在K线下方显示红色小圆圈
  • 买入信号（上穿20）在K线上方显示绿色小圆圈

内容的提问来源于stack exchange，提问作者Krishnendu Bhattacharyya