//新增多邊形**********************************************************************
var polygon_nc = new BMap.Polygon([
    new BMap.Point(120.333027, 31.532335),
    new BMap.Point(120.311899, 31.550431),
    new BMap.Point(120.326991, 31.5652),
    new BMap.Point(120.355018, 31.557324),
    new BMap.Point(120.354586
 
, 31.537013)   //第五個座標點
    //new BMap.Point(120.351424, 31.541199),  //6
    //new BMap.Point(120.346538, 31.556831),  //7
    //new BMap.Point(120.331302, 31.568154),  //8
    //new BMap.Point(120.286746, 31.557077),
    //new BMap.Point(120.274386, 31.538244)
    //new BMap.Point(120.331302, 31.568154)
], {strokeColor:"green"
 
,fillColor:"red",fillColorOpacity:"0.4", strokeWeight:2, strokeOpacity:0.3});  //建立多邊形
map.addOverlay(polygon_nc);   //增加多邊形

1. strokeColor:"red",      //邊線顏色。  
2.             fillColor:"red",        //填充顏色。當引數為空時，圓形將沒有填充效果。  
3.             strokeWeight: 3,        //邊線的寬度，以畫素為單位。  
4.             strokeOpacity: 0.8,     //邊線透明度，取值範圍0 - 1。  
5.             fillOpacity: 0.3,       //填充的透明度，取值範圍0 - 1。  
6.             strokeStyle: 'solid'    //邊線的樣式，solid或dashed。  
7.         },