云函数：
exports.main = async (event, context) => {
  try {
    const res = await cloud.openapi.subscribeMessage.send({
      data: event,
      // ocYSR4qHx354dI3_pnUYx6F8uEKc
      touser: 'ocYSR4qHx354dI3_pnUYx6F8uEKc', //发送通知给谁的openid
      templateId: 'P8ozdxC-fTGsocdknPnKjzdhVo9tg_bsLfBEbXyvS2c', //你的模板ID
      miniprogramState: 'developer',
      page: 'pages/a-home/home1' //这个是发送完服务通知用户点击消息后跳转的页面
    })
    console.log("成功：", res)
    return res
  } catch (err) {
    console.log("失败：", err)
    return err
  }
}