diff --git a/src/rooms/commands/DiscardCommand.ts b/src/rooms/commands/DiscardCommand.ts
index a5f5913..2351158 100644
--- a/src/rooms/commands/DiscardCommand.ts
+++ b/src/rooms/commands/DiscardCommand.ts
@@ -86,7 +86,7 @@ export class DiscardCommand extends Command<CardGameState, { client: Client, car
             }
         } else {
             let cardArr: Card[] = [...this.state.cards.values()];
-            let cardids = cardArr.map(o => o.id + '')
+            let cardids = cardArr.map(o => o.id)
             let self = this;
             this.room.send(client,'eat_card_s2c', {player: player.id, errcode: 0, errmsg: '', cards: cardids});
             let delay = this.room.battleMan.onCardLinkOver(player, cardArr);