var position = exchange.IO("api", "GET","/fapi/v2/positionRisk","timestamp="+Date.now()+"&symbol="+sym+"USDT")
var trades = exchange.IO("api", "GET","/fapi/v1/trades","limit=200×tamp="+Date.now()+"&symbol="+sym+"USDT")//获取最近成交
var depth = exchange.IO("IO", "api", "GET","/fapi/v1/depth","timestamp="+Date.now()+"&symbol="+sym+"USDT")//获取深度
postion 和 trades 都能取得数值,为什么 depth就是空的呢?谢谢