创建package.json

新建微信小程序是没有package.json文件的，创建此文件npm命令如下：
npm init
若出现

This utility will walk you through creating a package.json file.
It only covers the most common items, and tries to guess sensible defaults.

See `npm help init` for definitive documentation on these fields
and exactly what they do.

Use `npm install <pkg>` afterwards to install a package and
save it as a dependency in the package.json file.

Press ^C at any time to quit.

继续按Enter键即可。
PS：若一直按Enter键没有回应的话，看看你的工程名，一定要英文，不能包含中文。