fix

cluster/router/condition_router.go

@@ -104,6 +104,7 @@ func newConditionRouter(url *common.URL) (*ConditionRouter, error) {
 	}, nil
 }
 
+//Router determine the target server list.
 func (c *ConditionRouter) Route(invokers []protocol.Invoker, url common.URL, invocation protocol.Invocation) []protocol.Invoker {
 	if len(invokers) == 0 {
 		return invokers