1）浏览器报错  

Uncaught TypeError: Cannot assign to read only property 'exports' of object '#<Object>'

at Module. (BaseClient.js:23)

at Module../node_modules/webpack-dev-server/client/clients/BaseClient.js (BaseClient.js:38)

at __webpack_require__ (bootstrap:767)

at fn (bootstrap:130)

at Module. (SockJSClient.js:73)

at Module../node_modules/webpack-dev-server/client/clients/SockJSClient.js (SockJSClient.js:121)

at __webpack_require__ (bootstrap:767)

at fn (bootstrap:130)

at Object../node_modules/webpack-dev-server/client/socket.js (socket.js:52)

at __webpack_require__ (bootstrap:767)

解决办法：