npm run dev報錯內容：

ERROR  Failed to compile with 2 errors                                                                                               11:16:13

This dependency was not found:

* /Users/zhangsiyang/Documents/SmileDemo/node_modules/webpack-dev-server/client/index.js?http://localhost:8081 in multi (webpack)-dev-server/c
 

lient?http://localhost:8081 webpack/hot/dev-server ./src/main.js

To install it, you can run: npm install --save /Users/zhangsiyang/Documents/SmileDemo/node_modules/webpack-dev-server/client/index.js?http://l
ocalhost:8081


This relative module was not found:

* ./src/main.js in multi (webpack)-dev-server/client?http://localhost:8081 webpack/hot/dev-server ./src/main.js
 

解決：

npm install -save
npm run dev

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