ReturnResult«List«期货品种信息»»(ReturnResult«List«期货品种信息»»)

{
    "code": "string",
    "date": [
        {
            "contract": "string",
            "contractList": [
                {
                    "contract": "string",
                    "contractName": "string",
                    "mainContract": 0,
                    "productId": "string",
                    "productName": "string"
                }
            ],
            "contractName": "string",
            "exchangeCd": "string",
            "exchangeCdName": "string",
            "productId": "string",
            "productName": "string"
        }
    ],
    "msg": "string"
}