如何在JavaScript函数类中编辑属性？

我有一个基于纯javascript的类：

var DrawFeatureP = /*@__PURE__*/(function (Draw) {
    function DrawFeatureP() {
        debugger
        Draw.call(this, {
            source: new ol.layer.Vector({ source: new ol.source.Vector() }),
            type: 'change this property from function in pottom'
        });

        document.getElementById('lineToggle').onclick = this.handleDrawFeature.bind(this);
     }


    if (Draw) DrawFeatureP.__proto__ = Draw;
    DrawFeatureP.prototype = Object.create(Draw && Draw.prototype);
    DrawFeatureP.prototype.constructor = DrawFeatureP;

    DrawFeatureP.prototype.handleDrawFeature = function handleDraw(evt) {
        //when is function is fired how ca i set 'type' property?
    };

    return DrawFeatureP;
}(ol.interaction.Draw));

启动此函数时：

   DrawFeatureP.prototype.handleDrawFeature = function handleDraw(evt) {
            //when is function is fired how ca I set 'type' property?
        };

我需要更改“类型”属性：

type: 'change this property from function in the bottom'

---

我的问题是如何从handleDraw函数编辑类型属性？

由于在分配

onclick

处理程序时绑定了

this

，因此可以在处理程序函数中使用

this.type

    DrawFeatureP.prototype.handleDrawFeature = function handleDraw(evt) {
        this.type = "new type";
    };

---

在我看来，这个功能是不纯洁的。因为有dom操作。依我拙见如果有人非常感谢你这个职位，请改变我的想法。但是上面的例子不起作用。你知道原因是什么吗？