R write list to CSV line by line

在R 中把list对象逐行写入csv文件中，示例如下：

temp = list(x = data.frame(a = "a", b = "b", c = "c"),
        y = data.frame(d = "d", e = "e", f = "f"),
        z = data.frame(g = "g", h = "h", i = "i"))

for (i in 1:length(temp)) {
  write.table(temp[[i]], "temp.csv",col.names = F, append = T)
}