运行node项目报错

Question

PS D:\LearningHeavy\Web project\blog> npm start> blog@0.0.0 start D:\LearningHeavy\Web project\blog> node ./bin/wwwD:\blog\node_modules\express\lib\application.js:295    throw new Error('callback function required');    ^Error: callback function required    at EventEmitter.engine (D:\LearningHeavy\Web project\blog\node_modules\express\lib\application.js:295:11)    at Object.<anonymous> (D:\LearningHeavy\Web project\blog\app.js:16:5)    at Module._compile (module.js:570:32)    at Object.Module._extensions..js (module.js:579:10)    at Module.load (module.js:487:32)    at tryModuleLoad (module.js:446:12)    at Function.Module._load (module.js:438:3)    at Module.require (module.js:497:17)    at require (internal/module.js:20:19)    at Object.<anonymous> (D:\LearningHeavy\Web project\blog\bin\www:7:11)npm ERR! code ELIFECYCLEnpm ERR! errno 1npm ERR! blog@0.0.0 start: `node ./bin/www`npm ERR! Exit status 1npm ERR!npm ERR! Failed at the blog@0.0.0 start script.npm ERR! This is probably not a problem with npm. There is likely additional logging output above.npm ERR! A complete log of this run can be found in:npm ERR!     C:\Users\Voter\AppData\Roaming\npm-cache\_logs\2017-10-18T07_54_23_831Z-debug.log

Answer 1

295 行需要一个回调函数