SyntaxError: Use of const in strict mode.

具体报错console

c:UsersAdministratorWebstormProjectslogtest
ode_modulesconnect-mongosrcindex.js:4
const Promise = require('bluebird');
^^^^^
SyntaxError: Use of const in strict mode.
    at Module._compile (module.js:439:25)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Module.require (module.js:364:17)
    at require (module.js:380:17)
    at Object.<anonymous> (c:UsersAdministratorWebstormProjectslogtest
ode_modulesconnect-mongoindex.js:1:80)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Module.require (module.js:364:17)
    at require (module.js:380:17)
    at Object.<anonymous> (c:UsersAdministratorWebstormProjectslogtestapp.js:14:18)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)

Process finished with exit code 8

使用了const、let、"use strict"，解决方法：把connect-mongo版本降低一点，别用最新版，删除node_modules文件夹，

package.json中把connect-mongo这一条删了，换成"connect-mongo": "0.4.1"（用低版本的） 

最后：npm install