2.Random.sol

contract Random is VRFConsumerBase{

1.function requestNewRandom(uint256 toeknId ) public returns (bytes32)

谁能调它：

2.tokenId

顺序递增 —> 没有使用sfaeMath

 function _incrementTokenId() private {
        _currentTokenId++;
    }
    function _getNextTokenId() private view returns (uint256) {
        return _currentTokenId+1;
    }