是否有办法避免多次触发nativescript活动生命周期事件

let isInitialized = false;

export function onNavigatedTo(args: NavigationEventArgs) {
    const page = args.object;
    if (!isInitialized) {
        // 执行初始化代码
        console.log("Initializing...");
        isInitialized = true;
    }
}

let currentPage: Page;

export function onNavigatedTo(args: NavigationEventArgs) {
    const page = args.object;
    if (!currentPage) {
        currentPage = page;
        // 执行初始化代码
        console.log("Initializing...");
    }
}

let handler = () => {
    console.log("Event triggered");
};

export function onNavigatedTo(args: NavigationEventArgs) {
    const page = args.object;
    page.on(Page.navigatedFromEvent, handler, this);
}

export function onNavigatedFrom(args: NavigationEventArgs) {
    const page = args.object;
    page.off(Page.navigatedFromEvent, handler, this);
}

class Singleton {
    private static instance: Singleton;

    private constructor() {
        // 私有构造函数防止外部实例化
    }

    public static getInstance(): Singleton {
        if (!Singleton.instance) {
            Singleton.instance = new Singleton();
        }
        return Singleton.instance;
    }

    public initialize() {
        console.log("Initializing Singleton...");
    }
}

export function onNavigatedTo(args: NavigationEventArgs) {
    const singleton = Singleton.getInstance();
    singleton.initialize();
}