PineScript代码第21行else if语句报错，请求排查原因

错误核心原因 #

PineScript的if/else if结构有严格的语法规则，你的代码违反了以下要求：

• 代码块必须统一缩进：if条件下的strategy.entry("Long", strategy.long, tradeSize)没有缩进，编译器会判定if块在tradeSize = ...行就已经结束
• else if必须紧跟对应if块：因为前面的if块被提前终止，后续的else if找不到匹配的父级if，直接触发语法错误
• 额外问题：else if块内的tradeSize和strategy.entry同样未缩进，也不符合语法规范

修正后的完整代码 #

//@version=4

tradeDirection = input(direction.up, "Trade Direction") // direction of the breakout (up or down)
breakoutPeriod = input(14, "Breakout Period") // number of bars to look back for the breakout
stopLoss = input(0.002, "Stop Loss") // stop loss in percentage of the trade value
takeProfit = input(0.004, "Take Profit") // take profit in percentage of the trade value
maxTrades = input(2, "Maximum Number of Trades") // maximum number of open trades at the same time
maxRisk = input(0.01, "Maximum Risk per Trade") // maximum risk per trade in percentage of account value

// Next, we create a variable to track the highest or lowest price in the breakout period
breakoutPrice = tradeDirection == direction.up ? highest(high, breakoutPeriod) : lowest(low, breakoutPeriod)

// Then, we check if the current price has broken out of the breakout period and if we have not reached the maximum number of open trades
if (tradeDirection == direction.up and close > breakoutPrice and strategy.opentrades < maxTrades)
    // If it has, we calculate the trade size based on the maximum risk per trade
    tradeSize = maxRisk / (stopLoss * close)
    // And enter a long position with the calculated trade size
    strategy.entry("Long", strategy.long, tradeSize)

else if (tradeDirection == direction.down and close < breakoutPrice and strategy.opentrades < maxTrades)
    // If it has, we calculate the trade size based on the maximum risk per trade
    tradeSize = maxRisk / (stopLoss * close)
    // And enter a short position with the calculated trade size
    strategy.entry("Short", strategy.short, tradeSize)


// Finally, we set our stop loss and take profit levels
strategy.exit("Stop Loss", "Long", stopLossType.percent, stopLoss)
strategy.exit("Take Profit", "Long", profitType.percent, takeProfit)

// We repeat the same process for the short position
strategy.exit("Stop Loss", "Short", stopLossType.percent, stopLoss)
strategy.exit("Take Profit", "Short", profitType.percent, takeProfit)

内容的提问来源于stack exchange，提问作者Ricta