加入游戏时，标题显示为multiplayer

src/pages/game.wpy

@@ -45,9 +45,11 @@
       this.link = `${this.link}&version=${env}&account_id=${encodeURIComponent(account.account_id)}&session_id=${encodeURIComponent(account.session_id)}`;
       console.log('load page: ' + this.link);
       this.name = decodeURIComponent(params.name);
-      wepy.setNavigationBarTitle({
-        title: this.name
-      });
+      if (this.name) {
+        wepy.setNavigationBarTitle({
+          title: this.name
+        });
+      }
       this.share_image = decodeURIComponent(params.share_image);
       this.$apply();
     }

src/pages/index.wpy

@@ -179,7 +179,7 @@
           let gid = options.gid;
           let link = `${fcUrl}?id=${gid}&roomId=${roomId}`;
           wepy.navigateTo({
-            url: '/pages/game?link=' + encodeURIComponent(link) + '&gid=' + gid
+            url: '/pages/game?link=' + encodeURIComponent(link) + '&gid=' + gid +'&name=multiplayer'
           });
         }
       }