TradingView Pine Script：如何在蜡烛收盘前触发卖单？

我正在编写一个基于5EMA的交易策略，设定卖单触发条件为：前一根蜡烛的开盘价与收盘价均位于5EMA上方，且当前蜡烛价格跌破前一根蜡烛的低点。我需要在条件满足时立即触发卖单，但当前代码仅在蜡烛收盘后执行下单操作。曾尝试使用nz(request.security(syminfo.tickerid, "1", close))但未解决问题，请问如何修改代码以实现蜡烛收盘前下单？

原代码如下：

//@version=5
    strategy("New Gan Sell Signal 5EMA", overlay=true)

// Calculate 5 EMA
    emaLength = 5
    emaValue = ta.ema(close, emaLength)

    previousCandleClose = close[1]
    previousCandleOpen = open[1]
    previousCandleLow = low[1]
    previousCandleEMA = ta.ema(close, emaLength)[1]

// Check if previous candle's close and open were above the 5 EMA
    previousCandleAboveEMA =previousCandleClose>previousCandleEMA and previousCandleOpen> previousCandleEMA

// Check if previous candle's low is below the previous candle's EMA value
    previousCandleLowBelowEMA = previousCandleLow > previousCandleEMA


// Check if current price is below previous low
   currentPriceBelowPreviousLow = close < low[1] 

// Generate sell signal
    sellSignal = previousCandleAboveEMA and previousCandleLowBelowEMA and currentPriceBelowPreviousLow

// Plotting the 5 EMA and sell signal
    plot(emaValue, color=color.blue, title="5 EMA")
    plotshape(sellSignal, style=shape.triangledown, color=color.red, size=size.small, title="Sell Signal")

// Declare stop loss price variable
    var float stopLossPrice = na

// Open sell position and plot stop loss when sell signal is generated
    if sellSignal // and not strategy.position_size > 0
    strategy.entry("Sell", strategy.short)
    stopLossPrice := high[1]  // Set stop loss at the highest high of the last 5 candles
    strategy.exit("StopLoss", "Sell", loss=stopLossPrice)

// Declare take profit price variable
    var float takeProfitPrice = na

// Calculate take profit price based on stop loss value
    if sellSignal
    float stopLossValue = stopLossPrice - close  // Calculate stop loss value
    takeProfitPrice := close -(stopLossValue * 2)  //Calculate take profit price with 1:3 risk-reward ratio

// Plot take profit line
    line.new(x1 = bar_index[5], y1 = takeProfitPrice, x2 = bar_index, y2 = takeProfitPrice, color =     color.green, width = 1, style = line.style_solid)

// Check if take profit is hit
    if strategy.position_size > 0 and close <= takeProfitPrice
    strategy.close("Sell")  // Close the sell position when take profit is hit

// Plot stop loss line
    var float stopLossHigh = na
    if sellSignal
    stopLossHigh := high[1]  // Set stop loss at the high of the previous candle where the sell signal occurred
    line.new(x1 = bar_index[5], y1 = stopLossHigh, x2 = bar_index, y2 = stopLossHigh, color = color.red, width = 1, style = line.style_solid)

// Calculate take profit price based on stop loss value
    if sellSignal
    float stopLossValue = stopLossPrice - close  // Calculate stop loss value
    takeProfitPrice := close - (stopLossValue * 2)  // Calculate take profit price with 1:3 risk-reward ratio

// Plot take profit line
    line.new(x1 = bar_index[5], y1 = takeProfitPrice, x2 = bar_index, y2 = takeProfitPrice, color =   color.green, width = 1, style = line.style_solid)

// Plot sell signal price
    var float sellSignalPrice = na
    if sellSignal
    sellSignalPrice := close
    plot(sellSignalPrice, color=color.orange, linewidth=1, title="Sell Signal Price")

核心问题是原代码依赖close判断跌破前低，仅会在蜡烛收盘后触发信号。要实现盘中即时触发，需做以下关键修改：

修改要点 #

• 用实时价格判断跌破：将close < low[1]改为low < previousCandleLow，只要当前K线低点跌破前低就触发，无需等收盘。
• 允许盘中开仓：添加策略设置允许同一K线内触发交易。
• 清理重复代码：移除重复的止盈计算、画线逻辑，避免冗余操作。
• 修正逻辑错误：原代码中previousCandleLowBelowEMA变量名与实际判断逻辑不符，已修正。

修改后完整代码 #

//@version=5
strategy("New Gan Sell Signal 5EMA (Intraday Trigger)", overlay=true, 
         default_qty_type=strategy.cash, default_qty_value=10000,
         initial_capital=10000, commission_type=strategy.commission.percent, commission_value=0.1,
         risk_management=strategy.risk.allow_entry_in(strategy.long_short))

// 计算5周期EMA
emaLength = 5
emaValue = ta.ema(close, emaLength)

// 前一根K线数据
previousCandleClose = close[1]
previousCandleOpen = open[1]
previousCandleLow = low[1]
previousCandleHigh = high[1]
previousCandleEMA = emaValue[1]

// 前一根K线开、收盘均在EMA上方
previousCandleAboveEMA = previousCandleClose > previousCandleEMA and previousCandleOpen > previousCandleEMA
// 前一根K线低点在EMA上方（修正原代码变量名与逻辑不符问题）
previousCandleLowAboveEMA = previousCandleLow > previousCandleEMA

// 当前K线跌破前一根低点（用low实时检测，而非close）
currentPriceBelowPreviousLow = low < previousCandleLow

// 生成实时卖信号
sellSignal = previousCandleAboveEMA and previousCandleLowAboveEMA and currentPriceBelowPreviousLow

// 绘图
plot(emaValue, color=color.blue, title="5 EMA")
plotshape(sellSignal, style=shape.triangledown, color=color.red, size=size.small, title="Sell Signal", location=location.belowbar)

// 止盈止损变量
var float stopLossPrice = na
var float takeProfitPrice = na

// 触发卖单时开仓并设置止盈止损
if sellSignal and strategy.position_size <= 0 // 避免重复开仓
    strategy.entry("Sell", strategy.short)
    stopLossPrice := previousCandleHigh // 止损设为前一根K线高点
    stopLossValue = stopLossPrice - close
    takeProfitPrice := close - (stopLossValue * 2)
    // 一次性设置止盈止损退出
    strategy.exit("Exit", "Sell", stop=stopLossPrice, limit=takeProfitPrice)

// 绘制止盈止损线（避免重复画线）
var line slLine = na
var line tpLine = na
if sellSignal
    // 删除旧线
    if not na(slLine)
        line.delete(slLine)
    if not na(tpLine)
        line.delete(tpLine)
    // 绘制新线
    slLine = line.new(bar_index, stopLossPrice, bar_index + 20, stopLossPrice, color=color.red, width=1)
    tpLine = line.new(bar_index, takeProfitPrice, bar_index + 20, takeProfitPrice, color=color.green, width=1)

// 绘制开仓价格线
var float sellEntryPrice = na
if sellSignal
    sellEntryPrice := close
plot(sellEntryPrice, color=color.orange, linewidth=1, title="Sell Entry Price", style=plot.style_circles)

内容的提问来源于stack exchange，提问作者Ganapati Ns