mongoose 计算 点距离是多少?请教 - CNode技术社区

const Schema = new Schema({
 address: {type: String},
 loc: {
 type: [Number],
 index: '2dsphere'
 }
})
const test = db_conn.model('test', Schema);
test.find({
 loc: {
 $nearSphere: {
 $geometry: {
 type : "Point",
 coordinates : [116.401394, 39.917591]
 }
 }
 }
}).limit(5).exec(function (err, result) {
 console.log(result);
})
//查询结果
[ { _id: 5bab4b7dcdd99b12f00c4aae,
 address: '天安门',
 loc: [ 116.40355, 39.916152 ],
 __v: 0 },
 { _id: 5bab4b451ffff91e309800ff,
 address: '大兴',
 loc: [ 117.144185, 39.650336 ],
 __v: 0 },
 { _id: 5bab4c07370cd024887b407b,
 address: '保定99',
 loc: [ 115.48755, 38.885208 ],
 __v: 0 },
 { _id: 5bab4c07370cd024887b407a,
 address: '保定98',
 loc: [ 115.48754, 38.885197999999995 ],
 __v: 0 },
 { _id: 5bab4c07370cd024887b4079,
 address: '保定97',
 loc: [ 115.48752999999999, 38.885188 ],
 __v: 0 } ]