出现问题的情况：

或者：

D:\Program Files\nodejs>npm i --save-dev prettier

npm WARN saveError ENOENT: no such file or directory, open 'D:\Program Files\nodejs\package.json'

npm notice created a lockfile as package-lock.json. You should commit this file.

npm WARN enoent ENOENT: no such file or directory, open 'D:\Program Files\nodejs\package.json'

npm WARN nodejs No description

npm WARN nodejs No repository field.

npm WARN nodejs No README data

npm WARN nodejs No license field.

+ prettier@1.15.3

added 1 package from 1 contributor and audited 5020 packages in 7.879s

found 0 vulnerabilities

解决方法一：

D:\Program Files\nodejs>cd node_modules\npm

D:\Program Files\nodejs\node_modules\npm>npm i --save-dev prettier

npm notice created a lockfile as package-lock.json. You should commit this file.

+ prettier@1.15.3

added 1 package from 1 contributor and audited 5019 packages in 3.56s

found 0 vulnerabilities

解决方法二：

将D:\Program Files\nodejs\node_modules\npm 目录下的package.json复制到

打开cmd的当前路径下(C:\Users\rfzhang>)再执行npm i --save-dev prettier命令。

运行结果：

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