试图出售时出现脚本策略错误

Question

正如您在下面的代码快照中看到的那样，我有一个买卖信号。我正尝试将其添加到图表中以进行回测，并且它会进行初始购买，但之后将永远不会出售。我不确定为什么，因为我有一个类似的脚本在做同样的事情，但是在进行反向测试时，它来回卖得很好。我已经测试了我的卖出信号买入，看是否应该在图表上弹出一条线，并且这样做了，所以我的代码可以正常工作。靠背部分出了点问题。任何帮助表示赞赏，谢谢。

buy = (crossover(z100,c100) and z100>f100 and trend>reg or crossover(z100,f100) and z100>c100 and trend>reg) ? 50 : 7.5
plot(buy, title="buy", color=color.blue)
sell = (crossunder(z100,c100) and z100<f100 or crossunder(z100,f100) and z100<c100) ? 50 : 7.5
plot(sell, title="sell", color=color.red)
shares = 10000/close
// === INPUT BACKTEST RANGE ===
FromMonth = input(defval = 10, title = "From Month", minval = 1, maxval = 12)
FromDay   = input(defval = 24, title = "From Day", minval = 1, maxval = 31)
FromYear  = input(defval = 2019, title = "From Year", minval = 2017)
ToMonth   = input(defval = 12, title = "To Month", minval = 1, maxval = 12)
ToDay     = input(defval = 25, title = "To Day", minval = 1, maxval = 31)
ToYear    = input(defval = 9999, title = "To Year", minval = 2017)

// === FUNCTION EXAMPLE ===
start     = timestamp(FromYear, FromMonth, FromDay, 00, 00)  // backtest start window
finish    = timestamp(ToYear, ToMonth, ToDay, 23, 59)        // backtest finish window
window()  => time >= start and time <= finish ? true : false // create function "within window of time"
strategy.entry("buy", shares, when = window() and buy)  // buy long when "within window of time" AND crossover
strategy.close("sell", when = window() and sell) 

Answer 1

候选代码中的问题（假设为v4）：

1）根据参考手册（https://www.tradingview.com/pine-script-reference/v4），您需要将要关闭的未平仓交易的相同ID通知strategy.close，在这种情况下，将其称为“买入”，如下所示：

strategy.close("buy", when = window() and sell)

2）如果上述方法不能解决问题，请在为when和strategy.entry调用之前，先对strategy.close条件的表达式求值，然后将结果分配给变量，然后在when参数中引用此变量。