TBV4函數(shù)說明語法參數(shù)備注示例

1、分類索引數(shù)學函數(shù)9abs9acos9acosh9asin9asinh10atan10atan210atanh10ceiling11combin11cos12cosh12ctan12even12exp12fact13floor13fracpart13intpart14ln14log14mod14neg15odd15pi15power15rand16round16rounddown16roundup17sign17sin17sinh17sqr18sqrt18tan18tanh18字符串函數(shù)19exact19left19len19lower19mid20right20text20trim20uppe

2、r20value21顏色函數(shù)21black21blue21cyan21darkbrown21darkcyan22darkgray22darkgreen22darkmagenta22darkred22defaultcolor23green23lightgray23magenta23red23rgb24white24yellow24時間函數(shù)24currentdate24currenttime25dateadd25datediff25datetimetostring25datetostring25day26friday26hour26hourfromdatetime26makedate26maked

3、atetime27maketime27millisecond27millisecondfromdatetime27minute27minutefromdatetime28monday28month28monthfromdatetime28saturday28second29secondfromdatetime29stringtodate29stringtodatetime29stringtotime29sunday30systemdatetime30thursday30timediff30timetostring30tuesday31wednesday31weekday31weekdayfro

4、mdatetime31year31yearfromdatetime31數(shù)據(jù)函數(shù)32barcount32barstatus32c/close32currentbar32d/date33h/high33historydataexist33l/low33o/open33openint34t/time34v/vol34屬性函數(shù)34barinterval34bartype34bidasksize35bigpointvalue35canmarketorder35canshorttrade36canstoporder36cantrade36category36contractsize37contractun

5、it37currencyname37currencysymbol37datacount37exchangename38expireddate38getuserid38initialmargin38maintenancemargin38marginratio39maxbarsback39maxsingletradesize39minmove39pricescale39symbol40symbolname40symboltype40行情函數(shù)40q_askprice40q_askvol40q_avgprice41q_askpriceflag41q_bidprice41q_bidpriceflag41

6、q_bidvol41q_bidvol42q_high42q_hishigh42q_hislow42q_insidevol43q_last43q_lastdate43q_lastflag43q_lasttime43q_lastvol44q_low44q_lowerlimit44q_open44q_openint44q_openintflag45q_oscillation45q_outsidevol45q_preopenint45q_presettleprice45q_pricechg46q_pricechgratio46q_tickchg46q_todayentryvol46q_todayexi

7、tvol46q_totalvol47q_turnover47q_upperlimit47quotedataexist47帳戶函數(shù)47a_accountid47a_brokerid48a_buyavgprice48a_buyfreeze48a_buymargin48a_buyposition48a_buyprofitloss48a_currentequity49a_deleteorder49a_freemargin49a_getlastopenorderindex50a_getlastorderindex50a_getopenordercount50a_getordercount51a_open

8、orderbuyorsell51a_openordercontractno52a_openorderentryorexit52a_openorderfilledlot52a_openorderfilledprice53a_openorderlot53a_openorderprice54a_openorderstatus54a_openordertime54a_orderbuyorsell55a_ordercontractno55a_ordercanceledlot56a_orderentryorexit56a_orderfilledlot56a_orderfilledprice57a_orde

9、rlot57a_orderprice57a_orderstatus58a_ordertime58a_positionprofitloss59a_previousequity59a_profitloss59a_sendorder59a_sellavgprice60a_sellfreeze60a_sellmargin60a_sellposition60a_sellprofitloss60a_todaybuyposition61a_todaydeposit61a_todaydrawing61a_todaysellposition61a_totalavgprice61a_totalposition62

10、accountdataexist62枚舉函數(shù)62enum_buy62enum_canceled62enum_canceling63enum_declare63enum_declared63enum_deleted63enum_entry63enum_exit63enum_exittoday64enum_filled64enum_fillpart64enum_sell64交易函數(shù)64buy64buytocover65sell65sellshort66其他函數(shù)67alert67alertenabled67commentary67fileappend67filedelete68formulaname

11、68getglobalvar68gettbprofilestring68gettbprofilestring2file68iif69iifstring69invalidinteger69invalidnumeric69invalidstring70playwavsound70plotbool70plotnumeric70plotstring71setglobalvar71settbprofilestring71settbprofilestring2file72unplot72策略性能72avgbarseventrade72avgbarslostrade72avgbarswintrade73gr

12、ossloss73grossprofit73largestlostrade73largestwintrade73maxconseclosers74maxconsecwinners74maxcontractsheld74netprofit74numeventrades74numlostrades74numwintrades75percentprofit75totalbarseventrades75totalbarslostrades75totalbarswintrades75totaltrades76策略狀態(tài)76avgentryprice76barssinceentry76barssinceex

13、it76barssincelastentry76contractprofit77currentcontracts77currententries77entrydate77entryprice78entrytime78exitdate78exitprice78exittime79lastentrydate79lastentryprice79lastentrytime79marketposition79maxcontracts80maxentries80maxpositionloss80maxpositionprofit80positionprofit81組合性能81portfolio_gross

14、loss81portfolio_grossprofit81portfolio_maxdrawdown81portfolio_maxdrawdownratio81portfolio_netprofit82portfolio_percentprofit82portfolio_numwintrades82portfolio_numlosstrades82portfolio_totaltrades82組合狀態(tài)83portfolio_currentcapital83portfolio_currententries83portfolio_currentequity83portfolio_initcapit

15、al83portfolio_positionprofit83portfolio_totalprofit84portfolio_usedmargin84字母索引a_accountid43a_brokerid43a_buyavgprice44a_buyfreeze44a_buymargin44a_buyposition44a_buyprofitloss44a_currentequity44a_deleteorder45a_freemargin45a_getlastopenorderindex45a_getlastorderindex46a_getopenordercount46a_getorder

16、count47a_openorderbuyorsell47a_openordercontractno47a_openorderentryorexit48a_openorderfilledlot48a_openorderfilledprice49a_openorderlot49a_openorderprice49a_openorderstatus50a_openordertime50a_orderbuyorsell50a_ordercanceledlot51a_ordercontractno51a_orderentryorexit52a_orderfilledlot52a_orderfilled

17、price52a_orderlot53a_orderprice53a_orderstatus53a_ordertime54a_positionprofitloss54a_previousequity54a_profitloss55a_sellavgprice56a_sellfreeze56a_sellmargin56a_sellposition56a_sellprofitloss56a_sendorder55a_todaybuyposition56a_todaydeposit57a_todaydrawing57a_todaysellposition57a_totalavgprice57a_to

18、talposition57abs5accountdataexist58acos5acosh5alert62alertenabled62asin5asinh6atan6atan26atanh6avgbarseventrade68avgbarslostrade68avgbarswintrade68avgentryprice72barcount28barinterval30barssinceentry72barssinceexit72barssincelastentry72barstatus28bartype30bidasksize31bigpointvalue31black17blue17buy6

19、0buytocover61c/close28canmarketorder31canshorttrade31canstoporder32cantrade32category32ceiling7combin7commentary63contractprofit73contractsize32contractunit33cos7cosh8ctan8currencyname33currencysymbol33currentbar28currentcontracts73currentdate20currententries73currenttime20cyan17d/date28darkbrown17d

20、arkcyan17darkgray18darkgreen18darkmagenta18darkred18datacount33dateadd21datediff21datetimetostring21datetostring21day22defaultcolor18entrydate73entryprice73entrytime74enum_buy58enum_canceled58enum_canceling58enum_declare58enum_declared59enum_deleted59enum_entry59enum_exit59enum_exittoday59enum_fille

21、d59enum_fillpart60enum_sell60even8exact14exchangename33exitdate74exitprice74exittime74exp8expireddate34fact9fileappend63filedelete63floor9formulaname63fracpart9friday22getglobalvar64gettbprofilestring64gettbprofilestring2file64getuserid34green19grossloss69grossprofit69h/high29historydataexist29hour2

22、2hourfromdatetime22iif64iifstring65initialmargin34intpart10invalidinteger65invalidnumeric65invalidstring65l/low29largestlostrade69largestwintrade69lastentrydate75lastentryprice75lastentrytime75left15len15lightgray19ln10log10lower15magenta19maintenancemargin34makedate22makedatetime23maketime23marginr

23、atio34marketposition75maxbarsback35maxconseclosers69maxconsecwinners69maxcontracts76maxcontractsheld70maxentries76maxpositionloss76maxpositionprofit76maxsingletradesize35mid15millisecond23millisecondfromdatetime23minmove35minute23minutefromdatetime24mod10monday24month24monthfromdatetime24neg11netpro

24、fit70numeventrades70numlostrades70numwintrades70o/open29odd11openint29percentprofit71pi11playwavsound65plotbool66plotnumeric66plotstring66portfolio_currentcapital78portfolio_currententries79portfolio_currentequity79portfolio_grossloss77portfolio_grossprofit77portfolio_initcapital79portfolio_maxdrawd

25、own77portfolio_maxdrawdownratio77portfolio_netprofit77portfolio_numlosstrades78portfolio_numwintrades78portfolio_percentprofit78portfolio_positionprofit79portfolio_totalprofit79portfolio_totaltrades78portfolio_usedmargin79positionprofit76power11pricescale35q_askprice36q_askpriceflag37q_askvol36q_avg

26、price36q_bidprice37q_bidpriceflag37q_bidvol37q_bidvol38q_high38q_hishigh38q_hislow38q_insidevol38q_last39q_lastdate39q_lastflag39q_lasttime39q_lastvol39q_low40q_lowerlimit40q_open40q_openint40q_openintflag40q_oscillation41q_outsidevol41q_preopenint41q_presettleprice41q_pricechg41q_pricechgratio42q_t

27、ickchg42q_todayentryvol42q_todayexitvol42q_totalvol42q_turnover43q_upperlimit43quotedataexist43rand12red19rgb19right16round12rounddown12roundup12saturday24second24secondfromdatetime25sell61sellshort62setglobalvar67settbprofilestring67settbprofilestring2file67sign13sin13sinh13sqr13sqrt14stringtodate2

28、5stringtodatetime25stringtotime25sunday25symbol35symbolname36symboltype36systemdatetime26t/time30tan14tanh14text16thursday26timediff26.timetostring26totalbarseventrades71totalbarslostrades71totalbarswintrades71totaltrades71trim16tuesday26unplot68upper16v/vol30value16wednesday27weekday27weekdayfromda

29、tetime27white20year27yearfromdatetime27yellow20數(shù)學函數(shù)abs說明返回參數(shù)的絕對值。語法numeric abs(numeric number)參數(shù)number 需要計算其絕對值的實數(shù)。備注返回參數(shù)的絕對值，參數(shù)絕對值是參數(shù)去掉正負號后的數(shù)值。示例abs (2) = 2；abs (-2) = 2；abs (0) = 0；abs (-5.3) = 5.3；abs (10.43) = 10.43。acos說明返回參數(shù)的反余弦值。語法numeric acos(numeric number)參數(shù)number 角度的余弦值，必須介于 -11 之間。如果要用度表

30、示反余弦值，需將結果再乘以 180/pi()。 備注返回數(shù)字的反余弦值。反余弦值為一個角度，而該角度的余弦值即為該函數(shù)的參數(shù)。返回的角度值以弧度表示，范圍是0到pi。示例acos (-0.5) = 2.094395(2* pi /3 弧度)；acos (-0.5)*180/ pi () = 120(度)。acosh說明返回參數(shù)的反雙曲余弦值。語法numeric acosh(numeric number)參數(shù)number 大于等于 1 的實數(shù)。備注返回參數(shù)的反雙曲余弦值。參數(shù) number 必須大于或等于 1。反雙曲余弦值的雙曲余弦即為該函數(shù)的參數(shù)，因此 acosh (cosh(number)

31、等于 number。示例acosh (1) = 0；acosh (10) = 2.993223。asin說明返回參數(shù)的反正弦值。語法numeric asin(numeric number)參數(shù)number 角度的正弦值，必須介于 -11 之間。備注返回參數(shù)的反正弦值。反正弦值為一個角度，該角度的正弦值即等于此函數(shù)的參數(shù)。返回角度的單位為弧度，且范圍在 - pi /2 到 pi /2 之間。示例asin (-0.5) = -0.5236 ( - pi /6 弧度)；asin (-0.5)*180/ pi () = -30 (度)。asinh說明返回參數(shù)的反雙曲正弦值。語法numeric asin

32、h(numeric number)參數(shù)number 任意實數(shù)。備注返回參數(shù)的反雙曲正弦值，反雙曲正弦值的雙曲正弦即等于此函數(shù)的參數(shù)值，因此，asinh (sinh( number) 的值等于 number。示例asinh (-2.5) = -1.64723；asinh (10) = 2.998223。atan說明返回參數(shù)的反正切值。語法numeric atan(numeric number)參數(shù)number 角度的正切值。備注返回參數(shù)的反正切值。反正切值為角度，其正切值即等于參數(shù)值。返回的角度值將以弧度表示，范圍為 -pi/2 到 pi/2。如果要用度表示反正切值，需將結果再乘以 180/(

33、)。示例atan (1) = 0.785398(pi /4 弧度)；atan (1)*180/() = 45(度)。atan2說明返回給定的 x 及 y 坐標值的反正切值。語法numeric atan2(numeric x_num,numeric y_num)參數(shù)x_num 點的 x 坐標。y_num 點的 y 坐標。 備注返回給定的 x 及 y 坐標值的反正切值。反正切的角度值等于 x 軸與通過原點和給定坐標點（x_num, y_num）的直線之間的夾角。結果以弧度表示并介于 - pi到 pi之間（不包括 - pi）。結果為正表示從 x 軸逆時針旋轉的角度，結果為負表示從x 軸順時針旋轉的角

34、度。atan2 (a, b) 等于 atan(b/a)，除非 atan2值為零。如果 x_num 和 y_num 都為零，atan2返回無效值。如果要用度表示反正切值，需將結果再乘以 180/ pi()。 示例atan2 (1, 1) = 0.785398 (pi/4弧度)；atan2 (-1, -1) = -2.35619 (-3* pi /4 弧度)；atan2 (-1, -1)*180/ pi () = -135 (度)。 atanh說明返回參數(shù)的反雙曲正切值。語法numeric atanh(numeric number)參數(shù)number -11 之間的任意實數(shù)。備注返回參數(shù)的反雙曲正切

35、值，參數(shù)必須在 -11 之間（除去 -1 和 1）。反雙曲正切值的雙曲正切即為該函數(shù)的參數(shù)值，因此 atanh (tanh(number) 等于 number。示例atanh (0.76159416) = 1 （近似值）；atanh (-0.1) = -0.10034。ceiling說明將參數(shù) number 沿絕對值增大的方向，舍入為最接近的整數(shù)或基數(shù)significance的最小倍數(shù)。語法numeric ceiling(numeric number,numeric significance)參數(shù)number 待舍入的數(shù)值。significance 基數(shù)。備注將參數(shù) number 沿絕對值增大

36、的方向，舍入為最接近的整數(shù)或基數(shù)significance的最小倍數(shù)。例如，如果您不愿意使用像分這樣的零錢，而所要購買的商品價格為 $4.42，可以用公式 = ceiling (4.42,0.1) 將價格舍入為以角表示。如果參數(shù)為非數(shù)值型，ceiling返回無效值。無論數(shù)字符號如何，都按遠離 0 點方向舍入。如果數(shù)字已經(jīng)為 significance 的倍數(shù)，則不進行舍入。如果 number 和 significance 符號不同，ceiling返回無效值。示例ceiling (2.5, 1) = 3；ceiling (-2.5, -2) = -4；ceiling (-2.5, 2) = 無效值；

37、ceiling (1.5, 0.1) = 1.5；ceiling (0.234, 0.01) = 0.24。 combin說明計算從給定數(shù)目的對象集合中提取若干對象的組合數(shù)。語法integer combin (numeric number,numeric number_chosen)參數(shù)number 對象總的數(shù)量。number_chosen 每一組合中對象的數(shù)量。備注數(shù)字參數(shù)截尾取整。如果任一參數(shù)為非數(shù)值型，combin返回無效值。如果 number 0、number_chosen 0 或 number number_chosen，combin返回無效值。對象組合是對象整體的任意子集，且不論其

38、內(nèi)部順序。組合與排列不同，排列數(shù)與對象順序有關。假設從 8 名候選者中選出 2 人組成一隊，求所有可能的組合數(shù)：combin (8, 2 ) 等于 28 種編隊方案。 示例combin(8, 2) = 28。 cos說明返回給定角度的余弦值。語法numeric cos(numeric number)參數(shù)number 為需要求余弦的角度，以弧度表示。如果參數(shù)的單位是度，則可以乘以pi ()/180 將其轉換為弧度。備注返回給定角度的余弦值。示例cos (1.047) = 0.500171；cos (60*pi()/180) = 0.5，即 60 度的余弦值。cosh說明返回參數(shù)的雙曲余弦值。語法

39、numeric cosh(numeric number)參數(shù)number 表示要為其找到雙曲線余弦的任意實數(shù)。 備注返回參數(shù)的雙曲余弦值。示例cosh (4) = 27.30823；cosh (exp(1) = 7.610125，式中 exp(1) 等于 e，即自然對數(shù)的底數(shù)。ctan說明返回給定角度的余切值。語法numeric ctan(numeric number)參數(shù)number 需要計算其反余切值的實數(shù)。備注返回給定角度的余切值。示例ctan (0.785) = 1.00080；ctan (45* pi ()/180) = 1。even說明返回沿絕對值增大方向取整后最接近的偶數(shù)。語法i

40、nteger even(numeric number)參數(shù)number 所要取整的數(shù)值。備注返回沿絕對值增大方向取整后最接近的偶數(shù)。使用該函數(shù)可以處理那些成對出現(xiàn)的對象。如果 number 為非數(shù)值參數(shù)，則 even返回無效值。不論 number 的正負號如何，函數(shù)都向遠離零的方向舍入，如果 number 恰好是偶數(shù)，則無需進行任何舍入處理。 示例even (1.5) = 2；even (3) = 4；even (2) = 2；even (-1) = -2。 exp說明返回e的number次冪。語法numeric exp(numeric number)參數(shù)number 為底數(shù)e的指數(shù)。備注返回

41、e的number次冪。常數(shù) e 等于 2.71828182845904，是自然對數(shù)的底數(shù)。如果要計算以其他常數(shù)為底的冪，請用指數(shù)操作符（）。exp函數(shù)是計算自然對數(shù)的 ln 函數(shù)的反函數(shù)。示例exp (1) = 2.718282(e 的近似值)；exp (2) = e2 或 7.389056；exp (ln(3) = 3。 fact說明返回數(shù)的階乘。語法integer fact(numeric number)參數(shù)number 要計算其階乘的非負數(shù)。如果輸入的number不是整數(shù)，則截尾取整。備注返回數(shù)的階乘。示例fact (1) = 1；fact (1.9) = fact (1) 等于 1；f

42、act (0) = 1；fact (-1) = 無效值；fact (5) = 1*2*3*4*5 等于 120。 floor說明將參數(shù) number 沿絕對值減小的方向去尾舍入，使其等于最接近的 significance 的倍數(shù)。語法numeric floor(numeric number,numeric significance)參數(shù)number 所要舍入的數(shù)值。significance 基數(shù)備注返將參數(shù) number 沿絕對值減小的方向去尾舍入，使其等于最接近的 significance 的倍數(shù)。如果任一參數(shù)為非數(shù)值參數(shù)，則floor將返回錯誤值無效值。如果number和significa

43、nce符號相反，則函數(shù)floor將返回錯誤值無效值。不論number的正負號如何，舍入時參數(shù)的絕對值都將減小。如果number 恰好是significance 的倍數(shù)，則無需進行任何舍入處理。 示例floor (2.5, 1) = 2；floor (-2.5, -2) = -2；floor (-2.5, 2) = 無效值；floor (1.5, 0.1) = 1.5；floor (0.234, 0.01) = 0.23。fracpart說明返回實數(shù)舍入后的小數(shù)值。語法numeric fracpart(numeric number)參數(shù)number 需要計算其小數(shù)值的實數(shù)。備注返回實數(shù)舍入后的小

44、數(shù)值。等于 number - intpart(number)。 示例fracpart (2.49) = 0.49；fracpart (-8.93) = 0.07。 intpart說明返回實數(shù)舍入后的整數(shù)值。語法integer intpart(numeric number)參數(shù)number 需要進行取整處理的實數(shù)。備注返回實數(shù)舍入后的整數(shù)值。 示例intpart (8.9) = 8；intpart (-8.9) = -9。 ln說明返回一個數(shù)的自然對數(shù)。語法numeric ln(numeric number)參數(shù)number 所要取整的數(shù)值。備注返回一個數(shù)的自然對數(shù)。自然對數(shù)以常數(shù)項 e（2.7

45、1828182845904）為底。ln函數(shù)是exp函數(shù)的反函數(shù)。 示例ln (86) = 4.45437；ln (2.7182818) = 1；ln (exp (3) = 3；exp (ln (4) = 4。 log說明按所指定的底數(shù)，返回一個數(shù)的對數(shù)。語法numeric log(numeric number,numeric base)參數(shù)number 為用于計算對數(shù)的正實數(shù)。base 為對數(shù)的底數(shù)。 備注按所指定的底數(shù)，返回一個數(shù)的對數(shù)。示例log (10，10) = 1；log (8, 2) = 3；log (86, 2.7182818) = 4.454347。 mod說明返回兩數(shù)相除的余

46、數(shù)。語法integer mod(integer number,integer divisor)參數(shù)number 為被除數(shù)。divisor 為除數(shù)。如果divisor為零，函數(shù)mod返回無效值。 備注返回兩數(shù)相除的余數(shù)。結果的正負號與除數(shù)相同。函數(shù)mod可以借用函數(shù)intpart來表示：mod (n, d) = n - d*intpart(n/d)。示例mod (3, 2) = 1；mod (-3, 2) = 1；mod (3, -2) = -1；mod (-3, -2) = -1。 neg說明返回參數(shù)的負絕對值。語法numeric neg(numeric number)參數(shù)number 需要計

47、算其負絕對值的實數(shù)。備注返回參數(shù)的負絕對值，參數(shù)負絕對值是絕對值加上負號。示例neg (2) = -2；neg (-2) = -2；neg (0) = 0 ；neg (-5.3) = -5.3；neg (10.43) = -10.43。 odd說明返回對指定數(shù)值進行舍入后的奇數(shù)。語法integer odd(numeric number)參數(shù)number 要舍入求奇數(shù)的數(shù)值。備注返回對指定數(shù)值進行舍入后的奇數(shù)。如果number為非數(shù)值參數(shù)，函數(shù)odd將返回無效值。不論正負號如何，數(shù)值都朝著遠離0的方向舍入。如果number恰好是奇數(shù)，則不須進行任何舍入處理。示例odd (1.5) = 3；odd

48、 (3) = 3；odd (2) = 3；odd (-1) = -1；odd (-2) = -3。 pi說明返回數(shù)字3.1415926535898。語法numeric pi()參數(shù)無備注返回數(shù)字3.1415926535898，即數(shù)學常數(shù)pi，精確到小數(shù)點后 13 位。示例無power說明返回給定數(shù)字的乘冪。語法numeric power(numeric number,numeric power)參數(shù)number 底數(shù)，可以為任意實數(shù)。power 指數(shù)，number按該指數(shù)次冪乘方。備注返回給定數(shù)字的乘冪。可以用運算符代替函數(shù) power來表示對底數(shù)乘方的冪次，例如 52。示例power (5,

49、2) = 25；power (98.6,3.2) = 2401077；power (4,5/4) = 5.656854。 rand說明返回位于兩個指定數(shù)之間的一個隨機數(shù)。語法numeric rand(numeric bottom,numeric top)參數(shù)bottom 函數(shù)rand將返回的最小整數(shù)。top 函數(shù)rand將返回的最大整數(shù)。 備注返回位于兩個指定數(shù)之間的一個隨機數(shù)。每次計算都將返回一個新的數(shù)值。示例無round說明返回某個數(shù)字按指定位數(shù)舍入后的數(shù)字。語法numeric round(numeric number,integer num_digits)參數(shù)number 為需要向上舍入

50、的任意實數(shù)。num_digits 舍入后的數(shù)字的位數(shù)。備注返回某個數(shù)字按指定位數(shù)舍入后的數(shù)字。如果num_digits大于0，則舍入到指定的小數(shù)位。如果num_digits等于0，則舍入到最接近的整數(shù)。如果num_digits小于0，則在小數(shù)點左側進行舍入。 示例round (2.15, 1) = 2.2；round (2.149, 1) = 2.1；round (-1.475, 2) = -1.48；round (21.5, -1) = 20。 rounddown說明靠近零值，向下（絕對值減小的方向）舍入數(shù)字。語法numeric rounddown(numeric number,integer num_digits)參數(shù)number 為需要向上舍入的任意實數(shù)。num_digits 舍入后的數(shù)字的位數(shù)。備注靠近零值，向下（絕對值減小的