Pine Script中strategy.exit止损未按预期执行求助

我的Pine Script v5策略中，止盈参数profit=50（盈利50点对应2.5英镑利润）执行正常，但止损参数loss=25从未正确触发——预期亏损1.25英镑时平仓，实际亏损金额总是高于预期值。以下是策略代码：

//@version=5
strategy(title='Multi-RSI Trend Indicator', shorttitle='Multi-RSI', overlay=false)

rsiSource1 = input(title='RSI Source1', defval=ohlc4) 
rsiLength1 = input(title='RSI Length1', defval=4)
rsiValue1 = ta.rsi(rsiSource1, rsiLength1)
plot1 = plot(rsiValue1)

rsiSource2 = input(title='RSI Source2', defval=close)
rsiLength2 = input(title='RSI Length2', defval=10)
rsiValue2 = ta.rsi(rsiSource2, rsiLength2)
plot2 = plot(series=rsiValue2, color=rsiValue2 > 50 ? color.green : color.red)

fillCond = false
if (rsiValue1 > rsiValue2)
    fillCond := true
fillCond

fill(plot1, plot2, color=fillCond ? color.green : color.gray, transp=10)

ma(source, length, type) => ta.sma(source, length)

len = input.int(30, minval=1, title="Length")
src = rsiValue1
offset = input.int(title="Offset", defval=0, minval=-500, maxval=500)
out = ta.sma(src, len)
plot(out, color=color.blue, title="MA", offset=offset)

//maCond = false
//plot(rsiValue1, color=maCond ? color.green : color.gray)

//BackgroundData(symbol, timeframe, data) =>
//  isLive = barstate.isrealtime
//  request.security(symbol, timeframe, data[isLive ? 1 : 0]) [isLive ? 0 : 1]
//TimeFrame = input.timeframe("1", title="1 Minute")

CondLong = rsiValue1>out and rsiValue1>50 and rsiValue2>out and rsiValue2>50

CondShort = rsiValue1<out and rsiValue1<50 and rsiValue2<out and rsiValue2<50

grp_STRAT   = "Strategy settings"
timeInput   = input.time(timestamp("1 Feb 2023 00:00 +0000"), title="Start date", group=grp_STRAT)
tpInPips    = input.int(50, title="TP (in pips)", group=grp_STRAT)
slInPips    = input.int(25, title="SL (in pips)", group=grp_STRAT)

timePeriod  = time >= timeInput
notInTrade  = strategy.position_size <= 0

if  (CondLong and barstate.islast and timePeriod and notInTrade)
    strategy.entry("My Long Entry", strategy.long, qty=5)
strategy.exit("My Long Exit", "My Long Entry", loss=slInPips, profit=tpInPips)

if  (CondShort and barstate.islast and timePeriod and notInTrade)  
    strategy.entry("My Short Entry", strategy.short, qty=5)
strategy.exit("My Short Exit", "My Short Entry", loss=slInPips, profit=tpInPips)

核心问题分析 #

1. barstate.islast导致入场时机偏差
   入场条件中加入barstate.islast会让策略仅在最后一根实时K线触发入场信号，回测时历史K线不会满足该条件，导致入场信号延迟到下一根K线，入场价位偏离预期信号价位。止损是基于实际入场价计算的，最终实际亏损点数会远超设定的25点。

2. 点数与价位转换的潜在误解
   strategy.exit的loss/profit参数默认单位是品种的点数（points），但不同品种的点数对应最小变动单位（syminfo.mintick）不同。若未明确转换逻辑，可能出现参数设置与实际价位计算的偏差。

修复方案 #

方案1：移除barstate.islast（最关键修复）

删除入场条件中的barstate.islast，让策略在历史K线满足条件时正常触发入场，确保入场价位与信号对应，止损计算基准准确：

// 修改后的入场逻辑
if  (CondLong and timePeriod and notInTrade)
    strategy.entry("My Long Entry", strategy.long, qty=5)
strategy.exit("My Long Exit", "My Long Entry", loss=slInPips, profit=tpInPips)

if  (CondShort and timePeriod and notInTrade)  
    strategy.entry("My Short Entry", strategy.short, qty=5)
strategy.exit("My Short Exit", "My Short Entry", loss=slInPips, profit=tpInPips)

方案2：手动计算止损/止盈价位（提升精准度）

通过syminfo.mintick明确将点数转换为品种实际价位，使用stop和limit参数替代loss/profit，彻底避免点数单位误解：

// 修改后的完整入场与退出逻辑
if  (CondLong and timePeriod and notInTrade)
    strategy.entry("My Long Entry", strategy.long, qty=5)
    // 手动计算多单止损/止盈价位
    longStop = strategy.entry_price - slInPips * syminfo.mintick
    longProfit = strategy.entry_price + tpInPips * syminfo.mintick
    strategy.exit("My Long Exit", "My Long Entry", stop=longStop, limit=longProfit)

if  (CondShort and timePeriod and notInTrade)  
    strategy.entry("My Short Entry", strategy.short, qty=5)
    // 手动计算空单止损/止盈价位
    shortStop = strategy.entry_price + slInPips * syminfo.mintick
    shortProfit = strategy.entry_price - tpInPips * syminfo.mintick
    strategy.exit("My Short Exit", "My Short Entry", stop=shortStop, limit=shortProfit)

额外检查项

• 确认策略设置中的**滑点（Slippage）**参数未过高，滑点会导致实际成交价位偏离预期，扩大亏损。
• 检查仓位数量（qty=5）与账户资金的匹配性，避免因资金不足导致的仓位调整偏差。

内容的提问来源于stack exchange，提问作者Davorin