google map 绘制虚线边界

[javascript]

function drawPrePath(array,color){  

    

  var sorrow={  

  path: google.maps.SymbolPath.FORWARD_CLOSED_ARROW //arrow  

  };  

  var lineSymbol = {  

  path: 'M 0,-1 0,1',  

  strokeOpacity: 1,  //透明度

  scale: 3  //虚线长短

  };  

  var pathCoord = [  

  new google.maps.LatLng(37.772323, -122.214897),new google.maps.LatLng(21.291982, -157.821856),  

  new google.maps.LatLng(-18.142599, 178.431),new google.maps.LatLng(-27.46758, 153.027892)  

  ];  

  path = new google.maps.Polyline({  

  path: pathCoord ,  //虚线走的路径

  strokeColor:"#2d2d2d",  //线条颜色

  strokeOpacity: 0,  //填充色透明度

  strokeWeight: 2,  //宽度

  icons:[{icon:lineSymbol,offset: '0',repeat: '20px'}], //虚线偏移、重复度 

  map:map  

  });  

  path.setMap(map);  

}