node使用require mkdirp创建文件夹示例

npm i mkdirp -S // 1.0.4

const mkdirp = require('mkdirp');
await mkdirp(dir) //错误用法一

const mkdirp = require('mkdirp');
//错误用法二
mkdirp('./tmp/foo/bar/baz', function (err) {
  console.log(err); 
});

const mkdirp = require('mkdirp')
// 返回值是一个Promise，解析为创建的一个目录  
mkdirp('/tmp/foo/bar/baz').then(made =>
  console.log(made)
)

const mkdirp = require('mkdirp')
// 返回目录 同步写法
const made = mkdirp.sync('/tmp/foo/bar/baz')
console.log(made)

// 上传图片
async uploadImg() {
        const { ctx } = this
        const parts = ctx.multipart({ autoFields: true })
        const urls = []
        const dir = path.join(this.config.baseDir, 'app/public/upload/image/', dayjs().format('YYYY-MM-DD'))
        await mkdirp.sync(dir)
        let stream
        while ((stream = await parts()) != null) {
            const fileType = stream.mimeType.split('/')[1]
            const filename = dayjs().valueOf() + '.' + fileType || stream.filename.toLowerCase()
            const target = path.join(dir, filename)
            urls.push(`/public/upload/image/${filename}`)
            const writeStream = await fs.createWriteStream(target)
            await pump(stream, writeStream)
        }
        return urls[0]
    }

// 上传文件
    async uploadFile() {
        const { ctx } = this
        const urls = []
        const stream = await ctx.getFileStream()
        const dir = path.join(this.config.baseDir, 'app/public/upload/file/', dayjs().format('YYYY-MM-DD'))
        await mkdirp.sync(dir)
        const fileType = stream.filename.toLowerCase().split('.')
        const filename = dayjs().valueOf() + '.' + fileType[fileType.length - 1]
        // 生成写入路径
        const target = path.join(dir, filename)
        const writeStream = await fs.createWriteStream(target) // 写入流
        stream.pipe(writeStream) // 以管道方式写入流
        await new Promise((resolve, reject) => {
            writeStream.on('finish', () => {
                // 监听写入完成事件
                urls.push(`/public/upload/file/${filename}`)
                resolve(stream.fields)
            })
            writeStream.on('error', async (err) => {
                await sendToWormhole(stream) // 关闭管道
                writeStream.destroy() // 销毁
                reject(err)
            })
        })
        return urls[0]
    }