exchange.SetBase(Url)
if(exchange.GetName()!= 'Futures_FMex'){
    throw '此策略只支持FMEX永续'
}

var account = null
var records = null 
var pos = {direction:'empty',price:0,amount:0,unrealised_profit:0}


var total_efficiency = 0 //总效率
var my_efficiency = 0