function main() {
    transferToMain(100);
}

// 从U本位合约钱包向现货钱包划转指定数量的USDT
function transferToMain(amount){
    var ret = null;
    if (isOKexExchange()) {
        let param = "ccy=USDT" + "&from=18" + "&amt=" + amount.toString() + "&to=6";
        ret = exchange.IO("api", "POST", "/api/v5/asset/transfer", param);
    } else if (isBinanceExchange()) {
        let time = UnixNano() / 1000000;