const request = (params, opts, success, fail, complete) => {

  params = formatParams(params)

  params.Action = firstLetterUpper(params.Action)

  var defaultParams = _buildParams()

  params = Object.assign(defaultParams, params)

  var method = (opts.method || 'GET').toUpperCase()

  var normalized = normalize(params)

  var canonicalized = canonicalize(normalized)

  var stringToSign = `${method}&${encode('/')}&${encode(canonicalized)}`

  const key = 'u92uXpgg0jOuRf3wtd41Df1kxfqwAG' + '&'

  var signature = crypto.HMAC(crypto.SHA1, stringToSign, key, {

    asBase64: true

  })

  normalized.push(['Signature', encode(signature)])

  const url = method === 'POST' ? `${'https://iot.cn-shanghai.aliyuncs.com'}/` : `${'https://iot.cn-shanghai.aliyuncs.com'}/?${canonicalize(normalized)}`

  if (method === 'POST') {

    opts.headers = opts.headers || {};

    opts.headers['content-type'] = 'application/x-www-form-urlencoded'

    opts.data = canonicalize(normalized)

  }

  wx.request({

    url: url,

    data: opts.data ? opts.data : {},

    header: opts.headers,

    method: method,

    dataType: 'json',

    responseType: 'text',

    success: function(res) {

      if (typeof success === 'function')

        success(res)

      else

        console.log("success is not a function")

    },

    fail: function(res) {

      if (typeof fail === 'function')

        fail(res)

      else

        console.log("fail is not a function")

    },

    complete: function(res) {

      if (typeof complete === 'function')

        complete()

      else

        console.log("complete is not a function")

    }

  })

}

以上代码在云函数运行，提示wx is not defined，有没有朋友能帮我把这段代码该成在云函数里可以用的。

多谢！