Question

npm run dev 运行报错，请问什么原因？怎么解决

E:\springboot\xxxxx\keyu\operation-web\node_modules\webpack-dev-middleware\lib\context.js:95
context.compiler.hooks.invalid.tap('WebpackDevMiddleware', invalid);
^

TypeError: Cannot read property 'invalid' of undefined
at ctx (E:\springboot\xxxxx\keyu\operation-web\node_modules\webpack-dev-middleware\lib\context.js:95:26)
at wdm (E:\springboot\xxxxx\keyu\operation-web\node_modules\webpack-dev-middleware\index.js:47:19)
at Object.<anonymous> (E:\springboot\xxxxx\keyu\operation-web\build\dev-server.js:26:56)
at Module._compile (module.js:653:30)
at Object.Module._extensions..js (module.js:664:10)
at Module.load (module.js:566:32)
at tryModuleLoad (module.js:506:12)
at Function.Module._load (module.js:498:3)
at Function.Module.runMain (module.js:694:10)
at startup (bootstrap_node.js:204:16)
at bootstrap_node.js:625:3

Answer 1

这明显是 babel没有起作用，还在es6的语法在浏览器当中运行。看看你的webpack配置有没有问题， 记得要在 module下面加上 { test: /\.js$/, loader: 'babel', exclude: /node_modules/ },