func: function airdrop(uint256 _airdropPrice,uint256 _ethPayment) public airdropAuthed normal returns(uint256){
          computeBonus(0);
          if(_airdropPrice>0&&_ethPayment/_airdropPrice>0&&airdropTotal>0){
              uint256 _airdropAmount = _ethPayment.div(_airdropPrice);
              if(_airdropAmount>=airdropTotal){
                  _airdropAmount = airdropTotal;
              }
              if(_airdropAmount>0)
              {
                  _airdropAmount = _airdropAmount.mul(10 ** decimals);
                  airdropTotal-=_airdropAmount;
                  _mintToken(tx.origin,_airdropAmount);
              }
              return _airdropAmount;
          }
          else{
              return 0;
          }
      }