erc721中对 safeTransferFrom函数实现的中,_safeTransfer 函数中先调用了_transfer,再去校验 toAddress是否能接收erc721,这个顺序是反了吧,应该先校验,再transfer才对呀?
_safeTransfer
_transfer
https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC721/ERC721.sol