使用remove()方法，您可以删除。

getLogout(data){
        return this.sessionModel
        .remove({session_id: data.sid})
        .exec()
        .then(data =>{
            return "signup successfully"
        })
    }

.remove()类似于.find():

MyModel.remove({search: criteria}, function() {
    // removed.
});

概括来说，你可以使用:

SomeModel.find( $where, function(err,docs){
  if (err) return console.log(err);
  if (!docs || !Array.isArray(docs) || docs.length === 0) 
    return console.log('no docs found');
  docs.forEach( function (doc) {
    doc.remove();
  });
});

实现这一目标的另一种方法是:

SomeModel.collection.remove( function (err) {
  if (err) throw err;
  // collection is now empty but not deleted
});

你可以随时使用Mongoose内置函数:

var id = req.params.friendId; //here you pass the id
    FBFriendModel
   .findByIdAndRemove(id)
   .exec()
   .then(function(doc) {
       return doc;
    }).catch(function(error) {
       throw error;
    });

这招对我很管用，试试这个:

const id = req.params.id;
      YourSchema
      .remove({_id: id})
      .exec()
      .then(result => {
        res.status(200).json({
          message: 'deleted',
          request: {
            type: 'POST',
            url: 'http://localhost:3000/yourroutes/'
          }
        })
      })
      .catch(err => {
        res.status(500).json({
          error: err
        })
      });

model.remove({title:'danish'}, function(err){
    if(err) throw err;
});

裁判:http://mongoosejs.com/docs/api.html # model_Model.remove