数据插入后没有反馈

Question

我想在node.js完成向我的数据库插入记录后用我的ajax打印出来的东西。比如“console.log（'it working'）”但遗憾的是，在nodejs完成插入记录后，ajax无法打印出来。

AJAX

$(document).ready(function (e) {
    $("#new-user-form").on('submit',(function(e) {
        e.preventDefault();
        var data = {};
        data.title  = $('#title').val();
        data.fname  = $('#fname').val();
        data.mname  = $('#mname').val();
        data.lname  = $('#lname').val();
        data.mdname = $('#mdname').val();
        $('#loading').show();
        //toastr.success('Page Loaded!');
        $.ajax({
            url: "/new-user",
            type: "POST",            
            data: data,
            dataType: 'application/json',
            cache: false,        
            success: function(data) {
                console.log('it working');
                $('#loading').hide();
            }
        });
    }));
});

新-user.js的

var express = require('express'),
router  = express.Router(),
db      = require('./../db');

router.post('/', function (req,res,next) {
  var title       = req.body.title;
  var first_name  = req.body.fname;
  var middle_name = req.body.mname;
  var last_name   = req.body.lname;
  var maiden_name = req.body.mdname;
  var sql = db.insert({first_name:first_name,last_name:last_name}).into('users').then(function(data){
    res.send(data);
  });
if(sql){
  console.log('records inserted');
   }else{
    console.log('insertion failed');
   }
});