function getOffGameNFTTokensOf(
address _nftContract,
address _owner
) external view returns(uint256[] memory tokens)
data = await manageNftRouterContract.getOffGameNFTTokensOf(fairyNftContract.address, accounts[0].address)
// result
[
BigNumber { value: "1" },
BigNumber { value: "2" },
BigNumber { value: "3" }
]