remap用于topic的映射: 下面是两个launch启动两个节点的例子: 一个节点叫talker,它发布一个topic名为/talker 一个节点叫test1,它订阅一个topic名为/talker_mid <!--start_talker.launch--> <launch> <node pkg="test" type="talker" name="talker" output="screen"> <!--talker节点发布的topic为/talker--> <!--一个例子:将talker节点发布的话题/talker映射到/re_talker的名字上去--> <remap from="/talker" to="/re_talker" /> </node> </launch>1234567812345678<!--start_test1.launch--> <launch> <node pkg="test" type="test1" name="test1" output="screen"> <!--test1节点需要订阅话题为/talker_mid--> <!--一个例子将节点订阅的topic改名字为/re_talker--> <remap from="/talker_mid" to="/re_talker" /> </node> </launch>