CN106788957A - A kind of method and device of check timer time error - Google Patents
A kind of method and device of check timer time error Download PDFInfo
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- CN106788957A CN106788957A CN201611254554.XA CN201611254554A CN106788957A CN 106788957 A CN106788957 A CN 106788957A CN 201611254554 A CN201611254554 A CN 201611254554A CN 106788957 A CN106788957 A CN 106788957A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0016—Arrangements for synchronising receiver with transmitter correction of synchronization errors
Abstract
The invention discloses a kind of method and device of check timer time error.The method includes：The remaining time of the business that the reception server is issued；Local timer is called to start countdown according to the remaining time；Before countdown terminates, every default time-count cycle, the time-count cycle is calculated relative to the time error between local clock cycles；By the compensating timing error to current remaining time, countdown is continued according to the current remaining time in next time-count cycle.Using the present invention, while disclosure satisfy that good Consumer's Experience, it is ensured that do not increase rectification error on the premise of the pressure or other costs of server.
Description
Technical field
The present invention relates to the technical field of error correction, more particularly, to a kind of side of check timer time error
Method and device.
Background technology
In the middle of prior art, realize that the demand that a timer is accurate to the second is very common in Web, it can be used
Two kinds of sides of function setInterval that the timing of JavaScript timer events setTimeout or window object implementatio8 is called
Method is realized.But can either there is regular hour mistake in each time interval of setTimeout or setInterval
Difference, if to realize accumulation timing, will be more long with timing time, the error that each interval produces causes to miss by constantly accumulation
Difference is constantly exaggerated, so as to the time difference for causing the different periods of distinct device reaches more than ten seconds even more many, excessive time mistakes
Difference has user's report failure, and the UI displayings timing result for causing user to see is inconsistent, Consumer's Experience effect extreme difference.
By taking the remaining time count down timer on the taskbar of the live client of user as an example, user enters direct broadcast band
It is that a behavior for unicast, i.e. server end can be to the client push live datas of all entrance direct broadcast bands.Live client
End passively receives data side as one, and front end displaying countdown will realize countdown by JavaScript, and a user enters
Channel, live client receives the timing point data that unicast service comes, the count down timer since timing point, record
The moment T1 that this circulation starts, after timer shows timing result every time, the record moment T2 that next time, circulation started.Such as
Fruit is before next timer displaying result, and circulation time is poor (T2-T1) twice for calculating, T2-T1=1000 milliseconds in theory, real
Border is probably 1002,1000,1001,999 milliseconds etc., there is 1-2 milliseconds of error.Particularly, according to us to being based on
The timer of setInterval technologies is calculated, and the error that each second is based on setInterval generations can be up to 5 millis
Second, i.e., often by 1000 seconds, the displaying resultant error of timer can reach 1 to 5 second.As can be seen here, the client of prior art
There is the error for being difficult to predict in timer, and this error can be as snowball, over time accumulative and increasing,
For for on-the-spot broadcasting or other business higher to time precision requirement, such error is likely to result in associated
Business is paralysed.
The content of the invention
In view of the above problems, the present invention proposes a kind of method and device of check timer time error, disclosure satisfy that
While good Consumer's Experience, it is ensured that do not increase rectification error on the premise of the pressure or other costs of server.
A kind of method of check timer time error is provided in the embodiment of the present invention, including：
The remaining time of the business that the reception server is issued；
Local timer is called to start countdown according to the remaining time；
Before countdown terminates, every default time-count cycle, the time-count cycle is calculated relative to local clock week
Time error between phase；
By the compensating timing error to current remaining time, in next time-count cycle according to the current residue
Time continues countdown.
Preferably, it is no more than 1 second the time-count cycle.
Preferably, it is no more than 0.5 second the time-count cycle.
Preferably, it is described by the compensating timing error to current remaining time the step of, specifically include：
From this time-count cycle, add up the time error of each time-count cycle；
When accumulative time error exceedes metering threshold value, by the accumulative compensating timing error to it is current remaining when
Between；
From next time-count cycle, then add up the time error again.
Preferably, also include：
Before the countdown terminates, the business current remaining time is shown.
Preferably, the step of showing the business current remaining time, specifically includes：
According to default time format, show the business current remaining time rounds value.
Correspondingly, a kind of device of check timer time error is the embodiment of the invention provides, including：
Data receipt unit, the remaining time of the business issued for the reception server；
Timing start unit, for calling local timer to start countdown according to the remaining time；
Error calculation unit, for before countdown terminates, every default time-count cycle, calculates the time-count cycle
Relative to the time error between local clock cycles；
Error compensation unit, for by the compensating timing error to current remaining time, in next time-count cycle
Continue countdown according to the current remaining time.
Preferably, it is no more than 1 second the time-count cycle；Or, the time-count cycle is no more than 0.5 second.
Preferably, the error compensation unit, specifically includes：
Deviation accumulation unit, for from this time-count cycle, adding up the time error of each time-count cycle；When what is added up
When time error exceedes metering threshold value, by the accumulative compensating timing error to current remaining time；From next timing week
From phase, then add up the time error again.
Preferably, also include：
Time display unit, for before the countdown terminates, showing the business current remaining time, or,
For according to default time format, show the business current remaining time to round value.
Relative to prior art, the scheme that the present invention is provided, first, the remaining time of the business that the reception server is issued,
As a example by live, user enters direct broadcast band by client, and server end can be to the client push of all entrance direct broadcast bands
Live data, wherein the remaining time comprising business, the business is such as directed to playing in limited time for direct broadcasting room spectators.User visitor
Local timer is called to start countdown according to the remaining time in family end；The timer can by setTimeout with
SetInterval both approaches are realized, but existing these timers have a different degrees of error, or run it is fast or
It is that race is slow, although this error is that Millisecond is other, but if this error of leaving is amplified over time, will cause business
Paralyse, such as user takes for also underway, just discovery game after click participation of playing in limited time because timer race is slow
Terminate already, influence Consumer's Experience.If timer depends on server to re-issue remaining time, restart countdown,
Obviously error before this can be eliminated, and timer will restart the snowball of error.So not only without basic solve problem,
And the pressure of server is also add, it is a kind of method drunk poison to quench thirst.Unlike this, this programme terminates it in countdown
Before, every default time-count cycle, the time-count cycle is calculated relative to the time error between local clock cycles；By each
Client, as reference, is adjusted with reference to the time-count cycle of timer by each local clock to error, can realize
The error correction of different clients, by the compensating timing error to current remaining time, next time-count cycle according to
The current remaining time continues countdown, is preventive from possible trouble.So as to meet while good Consumer's Experience, it is ensured that
Rectification error on the premise of the pressure or other costs of server is not increased.
The additional aspect of the present invention and advantage will be set forth in part in the description, and these will become from the following description
Obtain substantially, or recognized by practice of the invention.
Brief description of the drawings
Technical scheme in order to illustrate more clearly the embodiments of the present invention, below will be to that will make needed for embodiment description
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for
For those skilled in the art, on the premise of not paying creative work, can also obtain other attached according to these accompanying drawings
Figure.
Fig. 1 is the error calibration method schematic diagram of prior art.
Fig. 2 is a kind of flow chart of the method for check timer time error of the invention.
Fig. 3 is a kind of first embodiment flow chart of the method for check timer time error of the invention.
Fig. 4 is first embodiment of the invention schematic diagram.
Fig. 5 is first embodiment of the invention design sketch.
Fig. 6 is a kind of schematic diagram of the device of check timer time error of the invention.
Fig. 7 is a kind of embodiment flow chart of the method for check timer time error of the invention.
Specific embodiment
In order that those skilled in the art more fully understand the present invention program, below in conjunction with the embodiment of the present invention
Accompanying drawing, is clearly and completely described to the technical scheme in the embodiment of the present invention.
In some flows of description in description and claims of this specification and above-mentioned accompanying drawing, contain according to
Multiple operations of particular order appearance, but it should be clearly understood that these operations can not be according to the suitable of its appearance herein
Sequence is performed or executed in parallel, the sequence number such as 101,102 etc. of operation, is only used for distinguishing each different operation, sequence number
Any execution sequence is not represented for itself.In addition, these flows can include more or less operation, and these operations can
To perform in order or executed in parallel.It should be noted that " first ", " second " herein etc. describes, it is for distinguishing not
Same message, equipment, module etc., does not represent sequencing, and it is different types also not limit " first " and " second ".
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, the every other implementation that those skilled in the art are obtained under the premise of creative work is not made
Example, belongs to the scope of protection of the invention.
The present invention realizes a kind of method of real time correction JAVSCRIPT timer periods errors.When front end displaying is remaining
Between countdown by JavaScript realize, server with broadcast or unicast in the form of to subscription client propelling data,
The equipment of subscription client receives the data that server comes, and timer starts countdown, record this circulation start when
T1 is carved, after timer shows timing result every time, the record moment T2 that next time, circulation started, next timer shows result
Before, circulation time is poor twice for calculating, and T2-T1=1000 milliseconds in theory, actual capabilities are 1002,1000,1001,999 etc.,
If not correcting the error circulated upper one second within the scope of 1 to 5 millisecond before circulation per second starts, error will be ceaselessly
Amplified by accumulation, often by 1000s, the displaying resultant error of timer can reach 1 to 5 second.Therefore, in the displaying of front end not
Same equipment, different time receives unicast data and the obvious inconsistent of existence time is understood after countdown after a while,
Fig. 1 is the error calibration method schematic diagram of prior art.Originally the error accumulated on this time was eliminated mainly to lead to
Cross server and just actively send out broadcast to the client of user at regular intervals, remaining time is updated, when falling original remaining clearly
Between count down timer, re-create, as shown in figure 1, the at a time user of direct broadcasting room, by respective customer end A
Equipment, B device, the data source of C device-to-servers apply for the remaining time of business that the data source of server is to each visitor again
Family end resends the remaining time lesftime of current business：3000S.Because the timer of each client is reset, institute
So that display result is unanimously 3000S.
The although less time of occurrence inconsistent probability of this way, but cannot avoid between broadcasting twice when
Between error cause display it is inconsistent, and greatly waste hardware and software resource.Due to remaining time count down timer
When the unicast or broadcast of server is received every time, the timer before will falling clearly creates new timer, therefore existing
Technology one of which solution is to allow server once to be broadcasted by the time of server certain intervals, it is possible to corrected
The time error accumulated within this section of interval time.But such way is not suitable for the huge live broadcast service of customer volume,
The direct broadcasting room of one big main broadcaster is stayed in same channel in the user that peak period has hundreds of thousands up to a million, if for the time of correcting
Error is once broadcast to millions of users, not only wastes flow, also increases the pressure of server, considerably increase hardware into
This.This way is that the preferable Consumer's Experience in front end is maintained by increasing the pressure of server, is that one kind is done something against one's will,
The way sacrificed future gains to satisfy present needs.Therefore the invention provides alternative solution, as shown in Figure 2.
Fig. 2 is a kind of flow chart of the method for check timer time error of the invention, including：
S101：The remaining time of the business that the reception server is issued；
S102：Local timer is called to start countdown according to the remaining time；
S103：Before countdown terminates, every default time-count cycle, calculate the time-count cycle relative to it is local when
Time error between the clock cycle；
S104：By the compensating timing error to current remaining time, in next time-count cycle according to described current
Remaining time continue countdown.
Relative to prior art, the scheme that the present invention is provided, first, the remaining time of the business that the reception server is issued,
As a example by live, user enters direct broadcast band by client, and server end can be to the client push of all entrance direct broadcast bands
Live data, wherein the remaining time comprising business, the business is such as directed to playing in limited time for direct broadcasting room spectators.User visitor
Local timer is called to start countdown according to the remaining time in family end；The timer can by setTimeout with
SetInterval both approaches are realized, but existing these timers have a different degrees of error, or run it is fast or
It is that race is slow, although this error is that Millisecond is other, but if this error of leaving is amplified over time, will cause business
Paralyse, such as user takes for also underway, just discovery game after click participation of playing in limited time because timer race is slow
Terminate already, influence Consumer's Experience.If timer depends on server to re-issue remaining time, restart countdown,
Obviously error before this can be eliminated, and timer will restart the snowball of error.So not only without basic solve problem,
And the pressure of server is also add, it is a kind of method drunk poison to quench thirst.Unlike this, this programme terminates it in countdown
Before, every default time-count cycle, the time-count cycle is calculated relative to the time error between local clock cycles；By each
Client, as reference, is adjusted with reference to the time-count cycle of timer by each local clock to error, can realize
The error correction of different clients, by the compensating timing error to current remaining time, next time-count cycle according to
The current remaining time continues countdown, is preventive from possible trouble.So as to meet while good Consumer's Experience, it is ensured that
Rectification error on the premise of the pressure or other costs of server is not increased.
Fig. 3 is a kind of first embodiment flow chart of the method for check timer time error of the invention.
S201：The remaining time of the business that the reception server is issued；
S202：Local timer is called to start countdown according to the remaining time；
S203：Before countdown terminates, every default time-count cycle, calculate the time-count cycle relative to it is local when
Time error between the clock cycle；
S204：From this time-count cycle, add up the time error of each time-count cycle；
S205：When accumulative time error exceedes metering threshold value, the accumulative compensating timing error is remained to current
The remaining time；
S206：From next time-count cycle, then add up the time error again.
S207：Before the countdown terminates, the business current remaining time is shown.
Present invention incorporates the realization principle of JAVSCRIPT timers, the conventional implementation bag of JAVSCRIPT timers
SetTimeout and two kinds of setInterval is included, their purposes are similar, the result of display is also similar, but both are per second
Time error is different, and setTimeout can be bigger than setInterval, because setTimeout methods will not be every 1 second
A timeCount function is carried out, but is crossed after setTimeout is called every time and is gone within 1 second to perform timeCount letters again
Number.If this means timeCount function bodies need performed for x seconds, then whole function then will just be performed per 1+x seconds
Once.And the function that setInterval will not be called by oneself is fettered, simply merely per just repetition at regular intervals
Perform a code of function.Therefore, the application scenarios of both approaches can be otherwise varied.SetInterval is adapted to will
Scene that certain action is just accurately carried out after at regular intervals often is sought, and setTimeout is adapted to be not desired to due to continuously calling
The problem that generation is interfered with each other, the scene for calling the calculating and process time very long that need complexity of particularly each function.
Present invention is generally directed to the error problem of remaining time count down timer, illustrated with setInterval more particularly suitable.Therefore
The technology explanation of this implementation is as shown in figure 4, will be with setInterval to realize case.
Fig. 4 is first embodiment of the invention schematic diagram.It is described to compare in limited time by taking the compulsory time for play business in on-the-spot broadcasting as an example
Match, every game has fixed duration, competes by the mutual PK of two teams people, taskbar is shown on screen, it is allowed between current live
Spectators be added thereto a team, before end of match take in competition.Obviously, the present invention is except suitable for above-mentioned compulsory time for play business,
Ballot business in limited time can be applied to, such as, there are two main broadcasters to race on the same stage between current live, the audience of direct broadcasting room can
Voted to wherein one main broadcaster with before main broadcaster's end of match.Etc. with the time limit be associated at least one in line service.
Assuming that thering are three users A, B, C successively to enter live by respective customer end A equipment, B device, C equipment respectively
Between.Direct broadcasting room carries out playing in limited time for war team PK, and A equipment is logged at first, and A equipment receives the list from server data source
Multicast data, wherein, remaining time leftTime of the unicast data comprising war team PK matches：3000s.A equipment calls are locally fallen
Timer starts countdown according to the remaining time 3000s.Before countdown terminates, every default timing week
Phase, the time-count cycle is calculated relative to the time error between local clock cycles.This implementation is using 500 milliseconds as in terms of one
When the cycle, according to actual measuring and calculating, every 1000 milliseconds of error between 1~5 millisecond, so, using 500 milliseconds as a timing
Cycle, can be by the control errors in each cycle at 0.5~2.5 millisecond.Such as, count down timer have passed through 500 milliseconds, when
Preceding remaining time is 2500 milliseconds, but the local clock of reality has already been through 502 milliseconds, by both contrasts, you can
Obtain 2 milliseconds of time error.By 2 milliseconds of time error compensation to current remaining time, when current remaining after compensation
Between be 2502 milliseconds, in next time-count cycle according to 2502 milliseconds of continuation countdowns of current remaining time.
After user A enters direct broadcasting room 1000S, by B device also into same channel, now, B device connects user B
The unicast data of server data source is received, wherein, the unicast data includes the current remaining time leftTime of war team PK matches：
2000s.Because every 500 milliseconds of A equipment oneself can all be compensated once before this, so, now, the remaining time of B device
While leftTime displaying results are 2000s, the remaining time leftTime of A equipment is 2000 ± 0.0025s.If display
Precision is all 2000s to second, then the display result of A equipment and B device.Similarly, when remaining time being 1000s seconds, user C leads to
Client C equipment is crossed into this channel, now the client of user A and user B is already by error transfer factor for several times, so,
As shown in figure 4, the displaying result of final remaining time leftTime is 1000s, wherein, ± 0.0025 time error is not
The operation and perception of user can be impacted, can be ignored.
Obviously, the error within a second, is also negligible for the display format of time, is come for user
Say, the error within a second is also inconspicuous.Preferably, above-mentioned error compensation can be accumulative every by accumulator
Individual error time-count cycle, when adding up more than 1 second, ability carry was compensated to remaining time, can so reduce compensation number of times, was improved
Operational efficiency.Specifically, A equipment adds up the time error of each time-count cycle from countdown 3000S is started；Made with 0.5 second
It it is a time-count cycle, it is assumed that the time error in each cycle is 2 milliseconds, it is assumed that the metering threshold value of accumulator is 1 second, is passed through
At 250 seconds, time error is accumulative up to 1 second, when accumulative time error exceedes metering threshold value, will now have influence on and be looked into user
The displaying result seen, by the accumulative time error compensation in 1 second to current remaining time；From next time-count cycle, then
Again add up the time error, when accumulative time error was again above metering threshold value 1 second, compensate again.Enter from A equipment
Enter direct broadcasting room, direct broadcasting room is entered to B device, in middle 1000 seconds, A equipment has been compensated only for 4 times, and the display to user is not influenceed
As a result, while improve operational efficiency.Before the countdown terminates, the business current remaining time is shown.Such as Fig. 5
Shown, Fig. 5 is first embodiment of the invention design sketch.Positioned at two cell-phone customer terminal screen lower rights, team PK ratios of as fighting
The taskbar of match, wherein, showing the spectators between current remaining time, current live can take in competition before end of match.
Wherein in one embodiment, the step of show the business current remaining time, specifically include：According to default
Time format, show the business current remaining time rounds value.As in previous embodiment, 1200.0012 seconds surplus
The remaining time, using the second as time format, then show 1200 seconds.If being 20.00002 minutes using minute as time format
Remaining time, be shown as 20 minutes.
It should be added that, the time-count cycle is no more than 1 second.The error of each time-count cycle can be controlled 5
Within millisecond, it is preferable that the time-count cycle is no more than 0.5 second.The time error in each cycle can further be reduced.
Fig. 6 is a kind of schematic diagram of the device of check timer time error of the invention, including：
Data receipt unit, the remaining time of the business issued for the reception server；
Timing start unit, for calling local timer to start countdown according to the remaining time；
Error calculation unit, for before countdown terminates, every default time-count cycle, calculates the time-count cycle
Relative to the time error between local clock cycles；
Error compensation unit, for by the compensating timing error to current remaining time, in next time-count cycle
Continue countdown according to the current remaining time.
Fig. 6 is corresponding with Fig. 2, and the method for operation of unit is identical with method in figure.
Fig. 7 is a kind of embodiment flow chart of the method for check timer time error of the invention.
As shown in fig. 7, the error compensation unit, specifically includes：
Deviation accumulation unit, for from this time-count cycle, adding up the time error of each time-count cycle；When what is added up
When time error exceedes metering threshold value, by the accumulative compensating timing error to current remaining time；From next timing week
From phase, then add up the time error again.
As shown in fig. 7, also including：
Time display unit, for before the countdown terminates, showing the business current remaining time, or,
For according to default time format, show the business current remaining time to round value.
Fig. 7 is corresponding with Fig. 3, and the method for operation of unit is identical with method in figure.
Preferably, the device of described check timer time error, wherein：The time-count cycle is no more than 1 second；Or,
The time-count cycle is no more than 0.5 second.
To sum up, a kind of device of real time correction JAVSCRIPT timer periods errors of the invention mainly realizes, every time displaying
Before timing result, timing error per second is first released, then per second to carry out once result displaying, the result of displaying is all every time
By the correction of two and half seconds error result, so that it is guaranteed that each timing error all in 0.5-2.5 milliseconds without
Amplified by ceaselessly accumulation, (0.5-2.5 is in the least at utmost time error to be reduced in real time negligible scope
Second) within.
It is apparent to those skilled in the art that, for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, may be referred to the corresponding process in preceding method embodiment, will not be repeated here.
Embodiment described above only expresses several embodiments of the invention, and its description is more specific and detailed, but simultaneously
Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for one of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Shield scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of method of check timer time error, it is characterised in that including：
The remaining time of the business that the reception server is issued；
Local timer is called to start countdown according to the remaining time；
Before countdown terminates, every default time-count cycle, calculate the time-count cycle relative to local clock cycles it
Between time error；
By the compensating timing error to current remaining time, in next time-count cycle according to the current remaining time
Continue countdown.
2. the method for check timer time error according to claim 1, it is characterised in that：The time-count cycle does not surpass
Spend 1 second.
3. the method for check timer time error according to claim 1, it is characterised in that：The time-count cycle does not surpass
Spend 0.5 second.
4. the method for check timer time error according to claim 1, it is characterised in that described to miss the time
The step of difference compensation is to current remaining time, specifically include：
From this time-count cycle, add up the time error of each time-count cycle；
When accumulative time error exceedes metering threshold value, by the accumulative compensating timing error to current remaining time；
From next time-count cycle, then add up the time error again.
5. the method for the check timer time error according to claim any one of 1-4, it is characterised in that also include：
Before the countdown terminates, the business current remaining time is shown.
6. the method for check timer time error according to claim 5, it is characterised in that the display business is current
Remaining time the step of, specifically include：
According to default time format, show the business current remaining time rounds value.
7. a kind of device of check timer time error, it is characterised in that including：
Data receipt unit, the remaining time of the business issued for the reception server；
Timing start unit, for calling local timer to start countdown according to the remaining time；
Error calculation unit, for before countdown terminates, every default time-count cycle, calculates the time-count cycle relative
Time error between local clock cycles；
Error compensation unit, for by the compensating timing error to current remaining time, next time-count cycle according to
The current remaining time continues countdown.
8. the device of check timer time error according to claim 7, it is characterised in that：The time-count cycle does not surpass
Spend 1 second；Or, the time-count cycle is no more than 0.5 second.
9. the device of check timer time error according to claim 7, it is characterised in that the error compensation list
Unit, specifically includes：
Deviation accumulation unit, for from this time-count cycle, adding up the time error of each time-count cycle；When the accumulative time
When error exceedes metering threshold value, by the accumulative compensating timing error to current remaining time；From next time-count cycle,
Add up the time error again again.
10. the device of check timer time error according to claim 7, it is characterised in that also include：
Time display unit, for before the countdown terminates, showing the business current remaining time, or, being used for
According to default time format, show the business current remaining time rounds value.
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| CN108765703A (en) * | 2018-05-23 | 2018-11-06 | 深圳怡化电脑股份有限公司 | Clocking method, device, storage medium and self-service device |
| CN110391861A (en) * | 2018-04-19 | 2019-10-29 | 北京京东尚科信息技术有限公司 | A kind of method and apparatus of check timer |
| CN111159612A (en) * | 2019-12-27 | 2020-05-15 | 广州华多网络科技有限公司 | Countdown method, system, device, computer equipment and storage medium |
| CN111338425A (en) * | 2020-02-26 | 2020-06-26 | 杭州涂鸦信息技术有限公司 | Method and system for realizing countdown of wireless low-power-consumption equipment |
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