从闭包函数调用方法

Question

我有一个CoffeeScript类：

class window.MapHandler
    map = null

    makeMap: () ->
        latlng = new google.maps.LatLng(54.711929,20.5089);
        myOptions =
            zoom: 12
            center: latlng
            mapTypeId: google.maps.MapTypeId.ROADMAP
        map = new google.maps.Map(document.getElementById("map_canvas"), myOptions)
        @geocode("Калининград, Чернышевского 101")


    placeMarker: (location) ->
        marker = new google.maps.Marker(
            position: location
            map: @map)

    geocode: (address) ->
        geocoder = new google.maps.Geocoder
        geocoder.geocode(
            'address': address,
            (results, status) -> 
                if status is google.maps.GeocoderStatus.OK
                    map.setCenter(results[0].geometry.location)
                    @placeMarker(results[0].geometry.location)
                else alert("Geocode was not successful for the following reason: " + status);
        )

当我从地理编码方法的匿名函数调用placeMarker方法时出现问题：visualizer.js：37Uncaught TypeError：Object [object DOMWindow]没有方法'placeMarker'

如何调用此方法？

Answer 1

geocode: (address) ->
    geocoder = new google.maps.Geocoder
    geocoder.geocode(
        'address': address,
        (results, status) => 
            if status is google.maps.GeocoderStatus.OK
                map.setCenter(results[0].geometry.location)
                @placeMarker(results[0].geometry.location)
            else alert("Geocode was not successful for the following reason: " + status);
    )

请注意第5行中的胖箭头 - 它会在闭包内保留this和@。