js实现googleMap中虚线的绘制方法

function drawPrePath(arraycolor){    var sorrow={  path: googlemapsSymbolPathFORWARD_CLOSED_ARROW //arrow  };  var lineSymbol = {  path: M   strokeOpacity:   scale:   };  var pathCoord = [  new googlemapsLatLng( )new googlemapsLatLng( )  new googlemapsLatLng( )new googlemapsLatLng( )  ];  path = new googlemapsPolyline({  path: pathCoord   strokeColor:"#ddd"  strokeOpacity:   strokeWeight:   icons:[{icon:lineSymboloffset: repeat: px}]  map:map  });  pathsetMap(map);}

var lineSymbol = {path: M strokeOpacity: scale: };

关键在于’M ’ 其实这是SVG的绘制路径的写法具体什么意思我还解释不清楚嘻嘻 自己学svg教程吧！