问云函数调用为什么不会调用到success fail？？

function getUserOpenID() {
  wx.cloud.callFunction({
    name: 'getUserOpenID',
    data: {},
    success(res) {
      console.log('success : ' + res)
      //return res.openid
    },
    fail(err) {
      console.error('getUserOpenID fail : ' + err)
      //return null
    },
    complete() {
      console.log('callFunction complete')
    }
  })

  console.log('callFunction end')
}