通过 BMap.BezierCurve 可以绘制贝塞尔曲线

// 路径锚点：3 个点 → 2 段曲线
var path = [
  new BMap.Point(116.399, 39.91),
  new BMap.Point(113.399, 39.91),
  new BMap.Point(110.399, 39.91)
];

// 控制点：第一段两个、第二段一个，与 path 的两段一一对应
var controlPoints = [
  [new BMap.Point(115.399, 40.91), new BMap.Point(114.399, 38.91)],
  [new BMap.Point(112.399, 38.91)]
];

// 贝塞尔曲线
var bc = new BMap.BezierCurve(path, controlPoints, {
  strokeColor: "#3370ff",
  strokeWeight: 4,
  strokeOpacity: 0.9
});

BMap.BezierCurve