百度地图 判断一个标注点是否在多边形区域里

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/**              * 计算一个点是否在多边形里              * @param {Object} pt 标注点              * @param {Object} poly 多边形数组              */              function isInsidePolygon(pt, poly){                  for (var c = false, i = -1, l = poly.length, j = l - 1; ++i < l; j = i)                       ((poly[i].lat <= pt.lat && pt.lat < poly[j].lat) || (poly[j].lat <= pt.lat && pt.lat < poly[i].lat)) &&                      (pt.lng < (poly[j].lng - poly[i].lng) * (pt.lat - poly[i].lat) / (poly[j].lat - poly[i].lat) + poly[i].lng) &&                      (c = !c);                  return c;              }