你需要设置 evaluate = TRUE 来强制求值/避免惰性求值

You need to set evaluate = TRUE to force evalutation / avoid lazy evaluation

p <- plot_ly()
p
for(line in my_lines) {  p <- add_trace(p, y=line[['y']], x=line[['x']], 
                 marker=list(color=line[['color']]),
                 evaluate = TRUE)
}
p