async getDelegateSp(){
  let user = 'lemooljiang'
  let res = await this.steem.api.getVestingDelegationsAsync(user, 'nutbox.mine', 1) 
  if(res.length === 0){
    return 0
  } else{
    return parseFloat(res[0].vesting_shares)
  }
  // let delegatedSp = parseFloat(res[0].vesting_shares) / spToVests 
  //刚查了下，如果滑有代理或是取消代理，就查询不到任何数值，为空，而不是0！
 },