//@version=4
strategy(title="EMA crosses", overlay=true)
// Inputs
priceData = input(title="Price data", type=input.source, defval=hl2)
ema1Length = input(title="EMA 1", type=input.integer, defval=12)
ema2Length = input(title="EMA 2", type=input.integer, defval=24)
ema3Length = input(title="EMA 3", type=input.integer, defval=36)
// Compute values
ema1 = ta.ema(priceData, ema1Length)
ema2 = ta.ema(priceData, ema2Length)
ema3 = ta.ema(priceData, ema3Length)
enterLong = ema1 > ema2 and ema2 > ema3
enterShort = ema1 < ema2 and ema2 < ema3
// Plot values
plot(series=ema1, color=color.orange, linewidth=2)
plot(series=ema2, color=color.maroon, linewidth=2)
plot(series=ema3, color=color.blue, linewidth=2)
// Submit orders
if (enterLong)
strategy.entry(id="Enter Long", long=strategy.long)
if (enterShort)
strategy.entry(id="Enter Short", long=strategy.short)
Derzeit wird der Code in der Rückmessung immer zu Beginn eines Befehls abgegeben, und dann scheinen die anderen nicht ausgelöst zu werden. Wer von Ihnen kann mir zeigen, wie man die Strategie-Loop ausführt?
strategy.entry(id="Enter Long", long=strategy.long)，这个函数调用写错了吧。
直接写：strategy.entry("Enter Long", strategy.long, 1) 这样就下单1手，张，一个币。
//@version=4
strategy(title="EMA_crosses", overlay=true)
// Inputs
priceData = input(title="Price_data", type=input.source, defval=hl2)
ema1Length = input(title="EMA_1", type=input.integer, defval=12)
ema2Length = input(title="EMA_2", type=input.integer, defval=24)
ema3Length = input(title="EMA_3", type=input.integer, defval=36)
// Compute values
ema1 = ta.ema(priceData, ema1Length)
ema2 = ta.ema(priceData, ema2Length)
ema3 = ta.ema(priceData, ema3Length)
enterLong = ema1 > ema2 and ema2 > ema3
enterShort = ema1 < ema2 and ema2 < ema3
// Plot values
plot(series=ema1, color=color.orange, linewidth=2)
plot(series=ema2, color=color.maroon, linewidth=2)
plot(series=ema3, color=color.blue, linewidth=2)
// Submit orders
if enterLong and strategy.position_size == 0
strategy.entry("Enter_Long", strategy.long, 1)
strategy.exit("exit_long", "Enter_Long", when = enterShort)
if enterShort and strategy.position_size == 0
strategy.entry("Enter_Short", strategy.short, 1)
strategy.exit("exit_short", "Enter_Short", when =enterLong)
// Colour background
backgroundColour = (strategy.position_size > 0) ? color.green : color.red
bgcolor(color=backgroundColour, transp=85)
调整了一下，但是还是只有策略开始的时候触发了一次，后面就没有触发了。辛苦小小梦再帮忙看看是哪里出错了。 
// Submit orders
if enterLong and strategy.position_size <= 0
strategy.entry("Enter_Long", strategy.long, 1)
// strategy.exit("exit_long", "Enter_Long", when = enterShort)
if enterShort and strategy.position_size >= 0
strategy.entry("Enter_Short", strategy.short, 1)
// strategy.exit("exit_short", "Enter_Short", when =enterLong)
这里判断设置不合适，我修改了下正常了。如果你写成==0，那么开仓以后另一个就不会触发了，因为有持仓了就不等于0了。
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