NPM packages not found

微信小程序云开发，构建NPM提示未找到，解决方案如下：

message： NPM packages not found. Please confirm npm packages which need to build are belong to `miniprogramRoot` directory. Or you may edit project.config.json's `packNpmManually` and `packNpmRelationList`

1.点击右键，打开cmd界面，输入：npm init -y

2.执行完成后，再输入：npm install

3.修改project.config.json文件，在‘setting’添加配置。

"packNpmManually": true,

    "packNpmRelationList": [      {        "packageJsonPath": "./package.json",        "miniprogramNpmDistDir": "./miniprogram/"      }    ]