When using the GeoNear() funcition in Mongoose, cannot get the ideal result(the result is empty)

gistfile1.js

// But when input the exact the same coordinate of a place I have stored in the database, it would be revealed.
// As for GeoJSON format, the unit of distance is meters.
// GeoJSON Multipoint require 2dsphere:
{
  type: "MultiPoint",
  coordinates: [
     [ -73.9580, 40.8003 ],
     [ -73.9498, 40.7968 ],
     [ -73.9737, 40.7648 ],
     [ -73.9814, 40.7681 ]
  ]
}
// Legacy coordinate pair require 2d index.
{
  $near: [ <x>, <y> ],
  $maxDistance: <distance in radians>
}