todo
-[] mapping(uint => uint) public tokenInfo
-[] getTokenSub() 查询接口过期时间
nft过期后是销毁？如何处理？
-[] 通过tokenIsExp来实现token功能，而nft是否销毁不定义在协议里
首先查阅EIP-1（https://github.com/ethereum/EIPs/blob/master/EIPS/eip-1.md）里面对于EIP的流程与要求的说明。
点击右上角的“Fork”，分叉（相当于复制）其文件夹。
将你的EIP添加到刚刚分叉出的文件夹里。这里有一个EIP模板（https://github.com/ethereum/EIPs/blob/master/eip-X.md）。
最后提交一个Pull请求到Ethereum的EIPs文件夹（https://github.com/ethereum/EIPs）。
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