hive.api.getVestingDelegations('ned', '', 2, function(err, result) {
  console.log(err, result)
})  //null []

eg:
async getDelegateHP(){
  let user = 'lemooljiang'
  let res = await hive.api.getVestingDelegationsAsync(user, '', 2) 
  if(res.length == 0){
    return 0
  } else{
    return parseFloat(res[0].vesting_shares)
  }
 }