我想转换一个简单的TradingView脚本“ ChannelBreakOutStrategy”来研究脚本，有人可以帮助我吗？
实际上，我在plotshape策略和研究方面存在差异，我不明白为什么。
//@version=4
strategy("ChannelBreakOutStrategy Julien", overlay=true)
length = input(title="Length", type=input.integer, minval=1, maxval=1000, defval=5)
upBound = highest(high, length)
downBound = lowest(low, length)
if (not na(close[length]))
strategy.entry("ChBrkLE", strategy.long, stop=upBound + syminfo.mintick, comment="Achat")
strategy.entry("ChBrkSE", strategy.short, stop=downBound - syminfo.mintick, comment="Vente")
我必须尝试通过此简单转换进行转换，但失败：
//@version=4
study("Alert convert Julien", overlay=true)
length = input(title="Length", type=input.integer, minval=1, maxval=1000, defval=10)
upBound = highest(high, length)
downBound = lowest(low, length)
short_cond = close[length] < downBound
long_cond = close[length] > upBound
plotshape(short_cond, title="vente", style=shape.triangledown, color=color.red)
plotshape(long_cond, title="achat", style=shape.triangleup, color=color.green)
alertcondition(short_cond or long_cond, title='Vente ou achat', message='Vente ou achat - Red and blue have crossed!')
plot(close)
在屏幕快照中看到差异“ Vente” =策略，而“ Test Vente” =学习测试：
谢谢！ ?
