泳道分组并且着色 分组用 box和endbox ,颜色用#xxx,标注用"xxx" box "浏览器" #LightGreen participant "浏览器1" as Browser participant "浏览器2" as Browser2 endbox participant "服务端" as Server #orange 未修改前: 修改后: 效果:可见图中浏览器1和浏览器2放到了一起,并且叫浏览器的title @startuml autonumber actor "用户" as User box "浏览器" #LightGreen participant "浏览器1" as B