當我掛載頁面時，我添加了一個 eventListner，如果用戶想要更改路由，我想將其刪除。但在我的情況下，在我更改路線后該事件仍然可用，如果我關閉選項卡，我仍然會收到警報。  mounted: function () {    window.addEventListener("beforeunload", this.detectTabClose);  },  beforeRouteLeave(to, from, next) {    //gets here and the route is changed, but this event is not removed    window.removeEventListener("beforeunload", this.detectTabClose, true);    next();  },detectTabClose(e) {    var confirmationMessage = "o/";    (e || window.event).returnValue = confirmationMessage;    return confirmationMessage;},