Method addCallback

packages/fairygui/src/core/Timer.ts:237–255

(
        interval: number,
        caller: any,
        callback: Function,
        repeat: boolean
    )

    }

    private addCallback(
        interval: number,
        caller: any,
        callback: Function,
        repeat: boolean
    ): void {
        this.clear(caller, callback);

        const id = this._nextId++;
        this._callbacks.set(id, {
            id,
            caller,
            callback,
            interval,
            elapsed: 0,
            repeat,
            removed: false
        });
    }

    /**
     * Dispose the timer