var PreBarTime = 0
function PlotMA_Kline(records, param, isFirst){
    var ma = TA.EMA(records, param)
    $.PlotRecords(records, "K")
    if(isFirst){
        for(var i = records.length - 1; i >= 0; i--){
            if(ma[i] !== null){
                $.PlotLine("ema", ma[i], records[i].Time)
            }
        }
        PreBarTime = records[records.length - 1].Time
    } else {
        if(PreBarTime !== records[records.length - 1].Time){
            $.PlotLine("ema", ma[ma.length - 2], records[records.length - 2].Time)
            PreBarTime = records[records.length - 1].Time
        }
        $.PlotLine("ema", ma[ma.length - 1], records[records.length - 1].Time)
    }


}

var MaCyc = 3

function main(){
    var maCyc = MaCyc
    var isFirst = true
    exchange.SetContractType("swap")
    while(1){
        var records = exchange.GetRecords()
        if(records && records.length > maCyc){
            PlotMA_Kline(records, maCyc, isFirst)
            isFirst = false
        }
        Sleep(1000)
    }
}

可以用这个代码测试，测试是一致的。