The hand teaches you how to write a strategy -- to translate a strategy into my language.

Hands that teach you how to write strategies and transplant a my language strategy

Recently, while talking with a friend about strategies, I learned that there are many problems with the flexibility of using my language writing strategies. In many cases, it is necessary to use the standard K-line cycle provided by the non-system, for example, the most commonly requested is the use of 4 hours of K-line.LinksHowever, in my language strategy, this problem is due to my language's highly encapsulated nature, which does not allow for flexible self-processing of data.

For trend strategy porting is very simple, we can use a sample code to fill in the data computation part of the code that drives the strategy, filling in the conditions for triggering the trade signal.

Reusable example code:

For example, the strategy used for OKEX futures.

// 全局变量
var IDLE = 0
var LONG = 1
var SHORT = 2
var OPENLONG = 3
var OPENSHORT = 4
var COVERLONG = 5
var COVERSHORT = 6  

var BREAK = 9
var SHOCK = 10  

var _State = IDLE
var Amount = 0                 // 记录持仓数量
var TradeInterval = 500        // 轮询间隔
var PriceTick = 1              // 价格一跳
var Symbol = "this_week"  

function OnTick(){
    // 驱动策略的行情处理部分
    // 待填充...
     
    // 交易信号触发处理部分
    // 待填充...  

    // 执行交易逻辑
    var pos = null
    var price = null
    var currBar = records[records.length - 1]
    if(_State == OPENLONG){
        pos = GetPosition(PD_LONG)
        // 判断是不是 满足状态，如果满足 修改状态
        if(pos[1] >= Amount){
            _State = LONG
            Amount = pos[1]   // 更新实际量
            return
        }
        price = currBar.Close - (currBar.Close % PriceTick) + PriceTick * 2
        Trade(OPENLONG, price, Amount - pos[1], pos, PriceTick)                // (Type, Price, Amount, CurrPos, PriceTick)
    }  

    if(_State == OPENSHORT){
        pos = GetPosition(PD_SHORT)
        if(pos[1] >= Amount){
            _State = SHORT
            Amount = pos[1]   // 更新实际量
            return
        }
        price = currBar.Close - (currBar.Close % PriceTick) - PriceTick * 2
        Trade(OPENSHORT, price, Amount - pos[1], pos, PriceTick)
    }  

    if(_State == COVERLONG){
        pos = GetPosition(PD_LONG)
        if(pos[1] == 0){
            _State = IDLE
            return
        }
        price = currBar.Close - (currBar.Close % PriceTick) - PriceTick * 2
        Trade(COVERLONG, price, pos[1], pos, PriceTick)
    }
    
    if(_State == COVERSHORT){
        pos = GetPosition(PD_SHORT)
        if(pos[1] == 0){
            _State = IDLE
            return
        }
        price = currBar.Close - (currBar.Close % PriceTick) + PriceTick * 2
        Trade(COVERSHORT, price, pos[1], pos, PriceTick)
    }
}  

// 交易逻辑部分
function GetPosition(posType) {
    var positions = _C(exchange.GetPosition)
    var count = 0
    for(var j = 0; j < positions.length; j++){
        if(positions[j].ContractType == Symbol){
            count++
        }
    }  

    if(count > 1){
        throw "positions error:" + JSON.stringify(positions)
    }  

    for (var i = 0; i < positions.length; i++) {
        if (positions[i].ContractType == Symbol && positions[i].Type === posType) {
            return [positions[i].Price, positions[i].Amount];
        }
    }
    Sleep(TradeInterval);
    return [0, 0];
}  

function CancelPendingOrders() {
    while (true) {
        var orders = _C(exchange.GetOrders)
        for (var i = 0; i < orders.length; i++) {
            exchange.CancelOrder(orders[i].Id);
            Sleep(TradeInterval);
        }
        if (orders.length === 0) {
            break;
        }
    }
}  

function Trade(Type, Price, Amount, CurrPos, OnePriceTick){    // 处理交易
    if(Type == OPENLONG || Type == OPENSHORT){                 // 处理开仓
        exchange.SetDirection(Type == OPENLONG ? "buy" : "sell")
        var pfnOpen = Type == OPENLONG ? exchange.Buy : exchange.Sell
        var idOpen = pfnOpen(Price, Amount, CurrPos, OnePriceTick, Type)
        Sleep(TradeInterval)
        if(idOpen) {
            exchange.CancelOrder(idOpen)
        } else {
            CancelPendingOrders()
        }
    } else if(Type == COVERLONG || Type == COVERSHORT){        // 处理平仓
        exchange.SetDirection(Type == COVERLONG ? "closebuy" : "closesell")
        var pfnCover = Type == COVERLONG ? exchange.Sell : exchange.Buy
        var idCover = pfnCover(Price, Amount, CurrPos, OnePriceTick, Type)
        Sleep(TradeInterval)
        if(idCover){
            exchange.CancelOrder(idCover)
        } else {
            CancelPendingOrders()
        }
    } else {
        throw "Type error:" + Type
    }
}  

function main() { 
    // 设置合约
    exchange.SetContractType(Symbol)  

    while(1){
        OnTick()
        Sleep(1000)
    }
}

Example: Transplantation of the double equation strategy

I'm not going to say anything about it.

This is the code of the Ma language strategy:

MA5^^MA(C,5);
MA15^^MA(C,15);
CROSSUP(MA5,MA15),BPK;
CROSSDOWN(MA5,MA15),SPK;

Porting to JavaScript policy

The first step is to fill in the Market Acquisition, Indicator Calculation section of the reusable sample code:

// 驱动策略的行情处理部分
var records = _C(exchange.GetRecords)  

if (records.length < 15) {
    return 
}  

var ma5 = TA.MA(records, 5)
var ma15 = TA.MA(records, 15)
var ma5_pre = ma5[ma5.length - 3]
var ma15_pre = ma15[ma15.length - 3]
var ma5_curr = ma5[ma5.length - 2]
var ma15_curr = ma15[ma15.length - 2]

So you can see that the two-square strategy is very simple, just get the data from the k-line first.records, and then useTA函数库The uniform line functionTA.MACalculate the 5-day mean line, 15-day mean line (as you can see on the retest interface, the K-line cycle is set to the daily K-line, soTA.MA(records, 5)This is the average of five days.TA.MA(records, 15)This is the 15th day of the lunar calendar. And then you getma5The second decimal point of the indicator datama5_curr(indicator value), the third decimal pointma5_pre(Indicator value)ma15The indicator data is symmetrical. The indicator data can then be used to judge the gold forks, as shown below:If this is the case, then it is a definite golden fork death fork.

If you have a message that you want to send to the other person, then the part of the message that you want to send to the other person is:

if(_State == IDLE && ma5_pre < ma15_pre && ma5_curr > ma15_curr){     
    _State = OPENLONG
    Amount = 1
}  

if(_State == IDLE && ma5_pre > ma15_pre && ma5_curr < ma15_curr){     
    _State = OPENSHORT
    Amount = 1
}  

if(_State == LONG && ma5_pre > ma15_pre && ma5_curr < ma15_curr){     
    _State = COVERLONG
    Amount = 1
}  

if(_State == SHORT && ma5_pre < ma15_pre && ma5_curr > ma15_curr){     
    _State = COVERSHORT
    Amount = 1
}

The transplant is OK, so you can go back and test: Re-testing the JavaScript policy Re-test the configuration:

回测结果：
![img](/upload/asset/16baa65d35e034e06a58.png) 

My language retest

The results of the retest are basically the same, so this is possible if you want to continue adding interactive features to the policy, adding data processing (e.g. K-line synthesis), adding custom graphic displays.

Students who are interested can try it.