r - 如何在 R 中自定义情节标题？

Question

plotly 中的饼图代码如下：

USPersonalExpenditure <- data.frame("Categorie"=rownames(USPersonalExpenditure), USPersonalExpenditure)
data <- USPersonalExpenditure[,c('Categorie', 'X1960')]

p <- plot_ly(data, labels = ~Categorie, values = ~X1960, type = 'pie') %>%
  layout(title = 'United States Personal Expenditures by Categories in 1960',
         xaxis = list(showgrid = FALSE, zeroline = FALSE, showticklabels = FALSE),
         yaxis = list(showgrid = FALSE, zeroline = FALSE, showticklabels = FALSE))

p

如何将样式添加到标题的一部分，例如 - “美国”以粗体显示，标题的其余部分以蓝色显示？

标签： rggplot2plotlyggplotly