如何在ggplot2中创建熔化数据框中两个变量的曲线图？

install.packages("ggplot2")

library(ggplot2)

df <- data.frame(x = c(1, 2, 3, 4, 5),
                 y1 = c(2, 4, 6, 8, 10),
                 y2 = c(1, 3, 5, 7, 9))
melted_df <- melt(df, id.vars = "x")

ggplot(data = melted_df)

ggplot(data = melted_df) +
  geom_line(aes(x = x, y = value, color = variable))

ggplot(data = melted_df) +
  geom_line(aes(x = x, y = value, color = variable)) +
  labs(title = "曲线图", x = "x轴", y = "y轴")