如何访问对象中的变量

Question

在Chrome开发工具中，我可以访问以下变量：

myLayer
  e {options: Object, _layers: Object, _initHooksCalled: true, _leaflet_events: Object, _leaflet_id: 29…}
    _geojson: Object
    _initHooksCalled: true
    _layers: Object
    30: e
        _icon: img.leaflet-marker-icon.leaflet-zoom-animated.leaflet-clickable
        _initHooksCalled: true
        _latlng: s.LatLng
        _leaflet_events: Object
        _leaflet_id: 30
        _map: e
        _popup: e
        _animated: true
        _content: "Location:Rotary Club of Dartmouth"
        _initHooksCalled: true
        _isOpen: false
        _source: e
        options: Object
        __proto__: i
        _popupHandlersAdded: true
        _shadow: null
        _zIndex: 267
        dragging: e
        feature: Object
        options: Object
        __proto__: i
    34: e
    __proto__: Object
    _leaflet_events: Object
    _leaflet_id: 29
    _map: e
    options: Object
    __proto__: i

我很困惑，因为它看起来不像普通物体。我想将isOpen变量设置为true - 我该怎么做？