1使用rosservice

1.1 rosservice list

$ rosservice list 1.2 rosservice type

$ rosservice type clear 1.3 rosservice call

$ rosservice call clear 通过查看再生（spawn）服务的信息，我们来了解带参数的服务:

$ rosservice type spawn| rossrv show $ rosservice call spawn 2 2 0.2 "" 2 Using rosparam

2.1 rosparam list

$ rosparam list 2.2 rosparam 设置 and rosparam 获取

$ rosparam set background_r 150

$ rosservice call clear $ rosparam get background_g $ rosparam get / 2.3 rosparam dump and rosparam load

$ rosparam dump params.yaml

$ rosparam load params.yaml copy

$ rosparam get copy/background_b