登陆的时候报错。
ReferenceError: User is not defined
at exports.login (D:\test\controllers\sign.js:129:3)
at callbacks (D:\test\node_modules\express\lib\router\index.js:272:11)
at param (D:\test\node_modules\express\lib\router\index.js:246:11)
at pass (D:\test\node_modules\express\lib\router\index.js:253:5)
at Router._dispatch (D:\test\node_modules\express\lib\router\index.js:280:5)
at Object.middleware [as handle] (D:\test\node_modules\express\lib\router\index.js:45:10)
at next (D:\test\node_modules\express\node_modules\connect\lib\http.js:204:15)
at next (D:\test\node_modules\express\node_modules\connect\lib\http.js:206:9)
at exports.send (D:\test\node_modules\express\node_modules\connect\lib\middleware\static.js:115:40)
at Object.static (D:\test\node_modules\express\node_modules\connect\lib\middleware\static.js:60:5)
