使用Node.js怎么压缩图片？方法介绍

// 获取buffer
export const getBufferFromFile = (filePath: string): Promise<Buffer> => {
  return new Promise((resolve, reject) => {
    fs.readFile(filePath, function (err: any, res: any) {
      if (!err) {
        resolve(res)
      }
    })
  })
}


// 压缩图片，传入图片文件路径，通过getBufferFromFile方法转为buffer 后进行压缩
const imageGzip = async (loaclFile: string): Promise<any> => {
  const bufferFile = await getBufferFromFile(loaclFile)
  let res
  try {
    res = await imagemin.buffer(bufferFile, {
      plugins: [
        imageminJpegtran(),
        imageminPngquant({
          quality: [0.6, 0.8],
        }),
      ],
    })
  } catch (err) {
    console.log(&#39;error&#39;, err)
    res = null
  }
  return res
}

export const upImageToQiniu = async (
  loaclFile: string,
  cb: { (res: any): void; (arg0: any): void },
  upConfig: QiNiuUpConfig
) => {
  const config = new qiniu.conf.Config()
  const formUploader = new qiniu.form_up.FormUploader(config)
  const putExtra = new qiniu.form_up.PutExtra()
  const token = getToken(upConfig.accessKey, upConfig.secretKey, upConfig.scope)
  let gzipImage
  if (upConfig.gzip) {
    gzipImage = await imageGzip(loaclFile)
  }
  // 获取当前时间戳
  var key = new Date().getTime()
  // 上传调用方法
  const uploadFnName = gzipImage ? 'putStream' : 'putFile'
  // 上传内容
  const uploadItem = gzipImage ? bufferToStream(gzipImage) : loaclFile
  // 七牛上传
  formUploader[uploadFnName](
    token,
    key,
    uploadItem,
    putExtra,
    function (respErr: any, respBody: any, respInfo: any) {
      if (respErr) {
        throw respErr
      }

      if (respInfo.statusCode === 200) {
        const url = upConfig.domain + '/' + respBody.key
        cb(url)
      }
    }
  )
}

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