问我可以在织机网络中使用其他令牌吗？织机网络是如何处理的？

EN

    pragma solidity ^0.5.0;

    //import ERC20 functionality ...

    contract  Example {

        ERC20   public token;

        //@param _token the address of the DAI smart contract
        constructor(ERC20 _token) public {
            token = ERC20(_token);
        }

        function () external payable {}

        function getBalance() public view returns (uint256) {
            return token.balanceOf(address(this));
        }

        function withdraw() public {
            token.transfer(msg.sender, getBalance());
        }
    }