Google Maps API - 使用javascript更改标记图标圆形比例尺寸基于缩放级别

Question

In Google Maps API - Change Marker Icon circle scale size Based On Zoom Level using javascript (zoom_changed function).

My object is below format.

icon = {p_a_L_1: 
       {path: 'M 0 0 L -2 -3 L 2 -3 z', 
        strokeColor: 'black', 
        fillColor: '#42fd04', 
        fillOpacity: 1, 
        scale: 3, 
        strokeOpacity: 0.6, 
        strokeWeight: 1.3}};