old_contents: var express = require('express');
  var path = require('path');
  var favicon = require('serve-favicon');
  var logger = require('morgan');
  var cookieParser = require('cookie-parser');
  var bodyParser = require('body-parser');
  var app = global.app = express();
  
  // view engine setup
  //app.set('views', path.join(__dirname, 'views'));
  //app.set('view engine', 'jade');
  
  app.use(logger('dev'));
  app.use(bodyParser.json());
  app.use(bodyParser.urlencoded({extended: false}));
  app.use(cookieParser());
  //app.use(express.static(path.join(__dirname, 'public')));
  
  module.exports = app;
  
new_contents: var express = require('express');
  var path = require('path');
  var favicon = require('serve-favicon');
  var logger = require('morgan');
  var cookieParser = require('cookie-parser');
  var bodyParser = require('body-parser');
  var app = global.app = express();
  
  // view engine setup
  //app.set('views', path.join(__dirname, 'views'));
  //app.set('view engine', 'jade');
  
  app.use(logger('dev'));
  // app.use(bodyParser.json());
  // app.use(bodyParser.urlencoded({extended: false}));
  
  app.use(bodyParser.json({limit: '50mb'}));
  app.use(bodyParser.urlencoded({limit: '50mb', extended: true}));
  
  app.use(cookieParser());
  //app.use(express.static(path.join(__dirname, 'public')));
  
  module.exports = app;
  
subject: fix bug:设定返回结果无法存储大的数值