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var points = [];
map.addEventListener("click", function (e) {
map.clearOverlays();
points.push(new BMap.Point(e.point.lng, e.point.lat));
DrawPolyline(points);
});
function DrawPolyline(points) {
var polyline = new BMap.Polyline(points, {strokeColor:"blue", strokeWeight:6, strokeOpacity:0.5});
map.addOverlay(polyline);
}