plate.hive 合约 概览 操作 (9) 结构体 (13) 表 (4) 应用二进制接口 结构体 (13) upgrade upgrade中的操作参数 { "name": "upgrade", "base": "", "fields": [ { "name": "from", "type": "name" }, { "name": "quantity", "type": "asset" }, { "name": "target", "type": "asset" } ] }