将markerLayer添加到此Google Map

Question

我正在尝试向Google地图添加CSS类或ID，以便将CSS应用于Markers.Ive看到了一些简化的示例，但似乎无法使它们适用于这种情况。这是我认为相关的代码部分。如何为标记分配课程？

        if (this.div_ = document.createElement("div"),

        this.setBoxStyle_(),
        void 0 === this.content_.nodeType ? this.div_.innerHTML = this.getCloseBoxImg_() + this.content_ : (this.div_.innerHTML = this.getCloseBoxImg_(),
        this.div_.appendChild(this.content_)),
        this.getPanes()[this.pane_].appendChild(this.div_),
        this.addClickHandler_(),
        this.div_.style.width ? this.fixedWidthSet_ = !0 : 0 !== this.maxWidth_ && this.div_.offsetWidth > this.maxWidth_ ? (this.div_.style.width = this.maxWidth_,
        this.div_.style.overflow = "auto",
        this.fixedWidthSet_ = !0) : (o = this.getBoxWidths_(),
        this.div_.style.width = this.div_.offsetWidth - o.left - o.right + "px",
        this.fixedWidthSet_ = !1),
        this.panBox_(this.disableAutoPan_),
        !this.enableEventPropagation_) {
            for (this.eventListeners_ = [],
            e = ["mousedown", "mouseover", "mouseout", "mouseup", "click", "dblclick", "touchstart", "touchend", "touchmove"],
            t = 0; t < e.length; t++)
                this.eventListeners_.push(google.maps.event.addDomListener(this.div_, e[t], s));
            this.eventListeners_.push(google.maps.event.addDomListener(this.div_, "mouseover", function(t) {
                this.style.cursor = "default"
            }))
        }
        this.contextListener_ = google.maps.event.addDomListener(this.div_, "contextmenu", function(t) {
            t.returnValue = !1,
            t.preventDefault && t.preventDefault(),
            i.enableEventPropagation_ || s(t)
        }),
        google.maps.event.trigger(this, "domready")