openlayers 已经点经纬度数组 怎么画线

/*画区域*/
/*points: Array(<{lon,lat}>)*/
drawPolygon:function(points)
{
var wkt="POLYGON(";
var length=points.length;
for(var i=0;i {
wkt+=points[i].lon+" "+points[i].lat;
if(i!=length-1)
{
wkt+=",";
}
}
wkt+=")";
var polygon = new OpenLayers.Feature.Vector(
OpenLayers.Geometry.fromWKT(wkt)
);
vectors.addFeatures([polygon]);

}

其中的vectors其实就是一个矢量图层

vectors = new OpenLayers.Layer.Vector("ClientVectorLayer");

以上画区域是通过构造一个polygon，然后加入到食量图层中就完了。points当然是一个点对象数组了