node加簽給釘釘提醒

const timestamp = new Date().getTime()
const secret="你的祕鑰"
const stringToSign = timestamp + "n" + secret
const sign = crypto.createHmac('sha256', secret).update(stringToSign).digest("base64")
// 最終獲得的簽名sign
const sign_urlencode = encodeURIComponent(sign)