【解決方案】報錯[nodemon] failed to start process, "babel-node" exec not found

1、錯誤詳情

$ npm run dev

> bxapp@1.0.0 dev /Users/xuzhaoning/WeChatProjects/bxapp
> cross-env NODE_ENV=development nodemon server/index.js --watch server --exec babel-node

[nodemon] 1.19.4
[nodemon] to restart at any time, enter `rs`
[nodemon] watching dir(s): server/**/*
[nodemon] watching extensions: js,mjs,json
[nodemon] starting `babel-node server/index.js`
sh: babel-node: command not found
[nodemon] failed to start process, "babel-node" exec not found
[nodemon] Error
    at Bus.<anonymous> (/Users/xuzhaoning/WeChatProjects/bxapp/node_modules/nodemon/lib/nodemon.js:156:25)
    at Bus.emit (events.js:215:7)
    at ChildProcess.<anonymous> (/Users/xuzhaoning/WeChatProjects/bxapp/node_modules/nodemon/lib/monitor/run.js:167:11)
    at ChildProcess.emit (events.js:210:5)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:272:12)

2、錯誤原因

修改了package.json文件，在dev命令的後面加上了--exec babel-node，再運行npm run dev就出現了上面的錯誤，因爲沒有添加babel插件

3、解決方法

（1）在項目下面創建.babelrc文件

$ cd project-name

$ touch .babelrc

（2）在.babelrc文件中添加下面代碼

{
    "presets": ["es2015"]
}

（3）打開終端，運行語句安裝插件

$ npm install babel-preset-es2015

$ npm install babel-cli -S 

這樣再次啓動npm run dev就成功了