function GetPosition(pair){
    let pos = _C(exchange.GetPosition, pair)
    if(pos.length == 0){
        return {amount:0, price:0, profit:0}
    }else if(pos.length > 1){
        throw '不支持双向持仓'
    }else{
        return {amount:pos[0].Type == 0 ? pos[0].Amount : -pos[0].Amount, price:pos[0].Price, profit:pos[0].Profit}
    }
}

function GetRatio(){