1.npm安装
npm安装教程:https://www.cnblogs.com/goldlong/p/8027997.html
补充:
出现警告:npm WARN [email protected] requires a peer of ajv@^6.9.1 but none is installed.you must installed peer dependencies youselfs.
解决方法:安装ajv@^6.9.1(根据警告内容) ,输入 npm install ajv@^6.9.1.