币安取消所有交易对未完成订单，使用IO接口，可以当作学习IO接口连接为支持API接口的范例
function cancellAll(){
try{
var openOrders = exchange.IO('api', 'GET', '/api/v3/openOrders');
for (var i=0; i<openOrders.length; i++){
var order = openOrders[i];
var currency = '';
if (order.symbol.endsWith('USDT')){
currency = order.symbol.slice(0,order.symbol.length-4) + '_' + 'USDT';
}
else{
currency = order.symbol.slice(0,order.symbol.length-3) + '_' + order.symbol.slice(order.symbol.length-3,order.symbol.length);
}
exchange.IO("currency", currency);
exchange.CancelOrder(order.orderId);
}
}
catch(err){
Log('error');
}
}
function main(){
cancellAll()
}