如 df1 <- data.frame(di=c(1,2,3,5,7,9),name=c("li si","zhangsan","xiaohong","wang liu","chen qi","zhao si"),value1=c(20,21,22,23,24,25),value2=c(30:31,32,33,34,35))

    df2 <- data.frame(di=c(1,2,3,4,10),name=c("li si","zhangsan","xiaohong","yangjiu", "anyii"),value1=c(20,21,22,34,36),value2=c(30,31,32,68,69))


求两个数据框合并，
结果如 df3 = (di=c(1,2,3,4,5,7,9,10),name=c("li si","zhangsan","xiaohong","yangjiu", "wang liu","chen qi","zhao si","anyii"),value1=c(40,42,44,23,34,24,25,36),value2=c(30,31,32,68,33,34,35,69))

紧急求救，如何得出如df3式的数据框
有现成的可用函数，或者代码皆可以？！！！！！！