通过 > listTA()
[[1]]
addVo()
[[2]]
addTA(ta = xts(TRUE, index(orcl$Close[, 0][which.max(orcl$Close)])),
on = -(1:2))
[[3]]
addTA(ta = Max, on = 1, col = "red", type = "b", lwd = 2)
[[4]]
addTA(ta = xts(TRUE, index(orcl$Close[, 0][which.min(orcl$Close)])),
on = -(1:2))
[[5]]
addTA(ta = Min, on = 1, col = "blue", type = "b", lwd = 2)
现在是如何使用 dropTA 删除其中一个ta，估计应该是如何获取listTA中的某个ta
