ERC20Token public tokenReward;    // 要卖的token
 address public owner;


 function AHVote(address addressOfTokenUsedAsReward) public{
     tokenReward = ERC20Token(addressOfTokenUsedAsReward);
     owner = msg.sender;
 }

  function vote()  public {
      tokenReward.transferFrom(msg.sender,address(this),100);
  }

/* modifier是修改标志 */
modifier onlyOwner {
    require(msg.sender == owner);
    _;
}