SuccessModel.js

class SuccessModel {
    constructor(data) {
        this.errno = 0
        if (data != null) {
            this.data = data
        }
    }
}

module.exports = SuccessModel

ctx.body = new SuccessModel(newAddress)

------------------------------

ErrorModel.js

class ErrorModel {
    constructor(errno = -1, message = 'error') {
        this.errno = errno,
        this.message = message
    }
}

module.exports = ErrorModel

ctx.body = new ErrorModel(10004, `创建地址失败`)

---------------------------------------------------------

方便调用

index.js

const SuccessModel = require('./SuccessModel')
const ErrorModel = require('./ErrorModel')

module.exports = {
    SuccessModel,
    ErrorModel
}