CN103019830B - Realize the method and device of browser script language execution fault tolerance - Google Patents
Realize the method and device of browser script language execution fault tolerance Download PDFInfo
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- CN103019830B CN103019830B CN201210593588.7A CN201210593588A CN103019830B CN 103019830 B CN103019830 B CN 103019830B CN 201210593588 A CN201210593588 A CN 201210593588A CN 103019830 B CN103019830 B CN 103019830B
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000004364 calculation method Methods 0.000 claims abstract description 30
- 230000002159 abnormal effect Effects 0.000 claims description 16
- 238000004458 analytical method Methods 0.000 claims description 6
- 230000006870 function Effects 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 2
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Abstract
The invention discloses a kind of method and device realizing browser script language execution fault tolerance, the described method realizing browser script language execution fault tolerance comprises the following steps: A, when starting to perform instruction, obtain the source operand of present instruction, it is judged that source operand is the most legal；The most then perform step B, otherwise perform step E；B, carries out ordering calculation, and decision instruction computing terminate after whether there is exception；The most then perform step C, otherwise perform step D；C, is entered as null value by target operand unassignable in described instruction；And perform step E；D, is assigned to target operand by the result of described ordering calculation；And perform step E；E, it may be judged whether performed all of instruction；The most then terminate this browser script to resolve, otherwise next instruction is set as present instruction, and returns execution step A.
Description
Technical field
The present invention relates to browser technology field, realize browser script particularly to one and perform appearance
Wrong method and device.
Background technology
Script is a kind of interpreted languages (such as JavaScript), preserves the most in the form of text, its
Source code needed not move through compiling before mailing to client operation, but text formatting character code was sent out
Give browser to be run by browser-interpreted.
In script, if a statement runs and mistake occurs, then statement below also cannot continue
Reforwarding row.When browsing webpage with web browser, generally occur within browser prompts webpage mistake and cannot
The phenomenon that normal browsing uses, this phenomenon great majority are owing to browser is to script language files in webpage
Occur what mistake caused when performing to resolve.The mistake performing script language files to occur when resolving includes relatively
Little, secondary syntax error and serious syntax error or logical error are the least or secondary
Syntax error refers to that usability of program fragments mistake occur will not produce weight to main logic, the major function of webpage
Affect (i.e. the execution result of this program segment is little on global procedures impact or does not affect).Therefore it is
Reduce the error rate of webpage, need the feelings that less or secondary script syntax error occurs in webpage
Under condition, remain able to ensure the normal browsing of webpage.
Summary of the invention
A kind of method realizing browser script language execution fault tolerance of offer is provided,
It is intended to prevent the less or secondary script syntax error of appearance in webpage from affecting the most clear of webpage
Look at.
In order to realize goal of the invention, the present invention provides a kind of side realizing browser script language execution fault tolerance
Method, this method realizing browser script language execution fault tolerance comprises the following steps:
A, when starting to perform instruction, obtains the source operand of present instruction, it is judged that source operand is the most legal；
The most then perform step B, otherwise perform step E；
B, carries out ordering calculation, and decision instruction computing terminate after whether there is exception；The most then perform
Step C, otherwise performs step D；
C, is entered as null value by target operand unassignable in described instruction；And perform step E；
D, is assigned to target operand by the result of described ordering calculation；And perform step E；
E, it may be judged whether performed all of instruction；The most then terminate this browser script
Resolve, otherwise next instruction is set as present instruction, and returns execution step A.
Preferably, also included before performing described step A:
It is corresponding script character by downloading the file decoding containing script-language program from server end
String；
According to morphology and syntactic analysis decoded script character string, and generate bytecode.
Preferably, described step C specifically includes:
C1, it is judged that whether comprise target operand in described instruction；The most then perform step C2, otherwise
Perform step E；
C2, it is judged that whether described target operand is assigned；The most then perform step E, otherwise perform
Step C3；
C3, is entered as null value by described target operand, and performs step E.
Preferably, described judge that source operand is the most legal particularly as follows: judge whether source operand is empty.
Preferably, the exception that described ordering calculation produces is: attribute or method that source operand is corresponding are not looked for
Arrive, or the type of source operand or scope do not meet the requirement of instruction.
The present invention also provides for a kind of device realizing browser script language execution fault tolerance, and this realizes browser
The device of script language execution fault tolerance includes:
First judge module, for when starting to perform instruction, obtains the source operand of present instruction, sentences
Disconnected source operand is the most legal；
Second judge module, for when the first judge module judges that described source operand is legal, refers to
Make computing, and decision instruction computing terminate after whether there is exception；
Processing module, for when the second judge module decision instruction computing exists abnormal, by described instruction
In unassignable target operand be entered as null value；Do not exist different in the second judge module decision instruction computing
Chang Shi, is assigned to target operand by the result of described ordering calculation；
At the first judge module, 3rd judge module, for judging that described source operand is illegal or processes
When module assignment operation completes, it may be judged whether performed all of instruction；The most then terminate this
Browser script resolves, and next instruction is otherwise set as present instruction, and is judged mould by first
Block continues executing with the source operand obtaining present instruction, it is judged that the operation that source operand is the most legal.
Preferably, the described device realizing browser script language execution fault tolerance also includes:
Decoder module, it is corresponding for being used for downloading the file decoding containing script-language program from server end
Script character string；
Analyze module, be used for according to morphology and syntactic analysis decoded script character string, and generate
Bytecode.
Preferably, described processing module includes:
First judging unit, is used for judging whether comprise target operand in described instruction；
Second judging unit, in time comprising target operand in the first judging unit decision instruction, sentences
Whether disconnected described target operand is assigned；
Processing unit, for when the second judging unit judges that described target operand is not assigned, by institute
State target operand and be entered as null value, and continued executing with by described 3rd judge module and judge whether to have held
Go the operation of all of instruction.
Preferably, described first judge module is used for judging whether source operand is empty.
Preferably, the exception that described ordering calculation produces is: attribute or method that source operand is corresponding are not looked for
Arrive, or the type of source operand or scope do not meet the requirement of instruction.
The source operand that the present invention is instructed by acquisition, first determines whether the legitimacy of this source operand, and
Directly skip present instruction in the case of source operand is illegal and be directly entered the execution of next instruction,
In the case of source operand is legal, it is judged that whether there is exception after performing order fulfillment, if existing abnormal,
Then unassignable target operand being entered as null value, secondly throw exception performs next instruction；If no
Exist abnormal, then the result after ordering calculation is assigned to target operand, secondly perform next instruction.
What therefore the present invention occurred when can effectively prevent the script language files in browser resolves webpage is less or secondary
The script syntax error wanted and affect the normal browsing of webpage, thus improve practicality.
Accompanying drawing explanation
Fig. 1 is the flow process signal that the present invention realizes method one embodiment of browser script language execution fault tolerance
Figure；
Fig. 2 is that the flow process of another embodiment of method that the present invention realizes browser script language execution fault tolerance is shown
It is intended to；
Fig. 3 is that the flow process of the another embodiment of method that the present invention realizes browser script language execution fault tolerance is shown
It is intended to；
Fig. 4 is the structural representation that the present invention realizes device one embodiment of browser script language execution fault tolerance
Figure；
Fig. 5 is the structural representation of processing module in Fig. 4.
The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, do referring to the drawings further
Explanation.
Detailed description of the invention
Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not used to limit
Determine the present invention.
It is method one embodiment that the present invention realizes browser script language execution fault tolerance with reference to Fig. 1, Fig. 1
Schematic flow sheet.The method realizing browser script language execution fault tolerance that the present embodiment provides includes following
Step:
Step S10, when starting to perform instruction, obtains the source operand of present instruction, it is judged that source operand is
No legal；The most then perform step S20, otherwise perform step S50；
In the present embodiment, when performing instruction, first obtain the source operand of instruction, then judge that source is grasped
The legitimacy counted.Specifically, in the present embodiment, can by judging whether source operand is null value, from
And the source operand of decision instruction is the most legal.If source operand is null value, then judge that source operand does not conforms to
Method；If source operand is not null value, then judge that source operand is legal.Such as, can be by calling a null value
Discriminant function judges the legitimacy of source operand.
Step S20, carries out ordering calculation, and decision instruction computing terminate after whether there is exception；If so,
Then perform step S30, otherwise perform step S40；
Step S30, is entered as null value by target operand unassignable in described instruction, and performs step
S50；
Step S40, is assigned to target operand by the result of described ordering calculation, and performs step S50；
In the present embodiment, after the source operand determining instruction is legal, ordering calculation will be carried out, if computing
Mistake occur, then can generate the exception of correspondence, this exception comprises error message, and is saved to an overall situation
In variable.Then by calling an abnormality detection functional query abnormal information, thus judge instructing
Whether mistake occurs during computing.If existing abnormal, then unassignable target operand in instructing
It is entered as null value；If there is not exception, then the result of ordering calculation is assigned to target operand.Should
Illustrating, in the present embodiment, the exception that above-mentioned ordering calculation produces is specially when operational order computing,
Do not find attribute or method that source operand is corresponding, or the type of source operand or scope do not meet instruction
Requirement.
Step S50, it may be judged whether performed all of instruction；If so, step S60 is performed, otherwise
Perform step S70；
Step S60, terminates this browser script and resolves；
Step S70, is set as next instruction present instruction, and returns execution step S10.
When having performed above-mentioned steps S30 or S40 or having judged that source operand itself does not conforms in step slo
During method, then it represents that performed an instruction, now need next instruction is set as present instruction,
Again perform present instruction.After all of instruction has been performed both by, just complete a browser script language
Speech resolves.
The source operand that the present invention is instructed by acquisition, first determines whether the legitimacy of this source operand, and
Directly skip present instruction in the case of source operand is illegal and be directly entered the execution of next instruction,
In the case of source operand is legal, it is judged that whether there is exception after performing order fulfillment, if existing abnormal,
Then unassignable target operand being entered as null value, secondly throw exception performs next instruction；If no
Exist abnormal, then the result after ordering calculation is assigned to target operand, secondly perform next instruction.
What therefore the present invention occurred when can effectively prevent the script language files in browser resolves webpage is less or secondary
The script syntax error wanted and affect the normal browsing of webpage, thus improve practicality.
It is another embodiment of method that the present invention realizes browser script language execution fault tolerance with reference to Fig. 2, Fig. 2
Schematic flow sheet.Based on above-described embodiment, in the present embodiment, above-mentioned perform above-mentioned steps S10 it
Before also include:
S80, is corresponding script character by downloading the file decoding containing script from server end
String；
S90, according to morphology and syntactic analysis decoded script character string, generates bytecode.
It should be noted that, the job sequence that above-mentioned bytecode is made up of operation code and operand；Browse
Device resolver will perform each instruction of bytecode the most one by one.
It is the another embodiment of method that the present invention realizes browser script language execution fault tolerance with reference to Fig. 3, Fig. 3
Schematic flow sheet.Based on above-described embodiment, in the present embodiment, above-mentioned steps S30 specifically includes:
Step S31, it is judged that whether comprise target operand in instruction；The most then perform step S32, no
Then perform step S50；
S32, it is judged that whether target operand is assigned；The most then perform step S50, otherwise perform step
Rapid S33；
S33, is entered as target operand null value, and performs step S50.
In the present embodiment, deposit after ordering calculation terminates in abnormal cases, first determine whether currently to perform
Whether execution comprising target operand, if there is not target operand, then judging whether to have performed
All of instruction, the most then terminate this browser script and resolve；If it is not, then next is referred to
Order is set as present instruction, and returns execution step S10.In the case of there is target operand, it is judged that
Whether target operand is assigned, if target operand has been assigned, then judges whether to have performed
All of instruction, the most then terminate this browser script and resolve；If it is not, then next is referred to
Order is set as present instruction, and returns execution step S10；If target operand is not assigned, then by target
Operand is entered as null value, then judges whether to have performed all of instruction, the most then terminate this
Secondary browser script resolves；If it is not, next instruction is then set as present instruction, and return is held
Row step S10.
The present invention also provides for a kind of device realizing browser script language execution fault tolerance, is used for realizing above-mentioned
Method.It is device one embodiment that the present invention realizes browser script language execution fault tolerance with reference to Fig. 4, Fig. 4
Structural representation.The device realizing browser script language execution fault tolerance that the present embodiment provides includes:
First judge module 100, for when starting to perform instruction, obtains the source operand of present instruction,
Judge that source operand is the most legal；
In the present embodiment, when performing instruction, first obtained the source behaviour of instruction by the first judge module 100
Count, and judge the legitimacy of source operand.Specifically, in the present embodiment, can be by judging that source operates
Whether number is null value, thus the source operand of decision instruction is the most legal.If source operand is null value, then
Judge that source operand is illegal；If source operand is not null value, then judge that source operand is legal.Such as,
The legitimacy of source operand can be judged by calling a vacant discriminant function.
Second judge module 200, is used for when the first judge module 100 judges that described source operand is legal,
Carry out ordering calculation, and decision instruction computing terminate after whether there is exception；
Processing module 300, for when the second judge module 200 decision instruction computing exists abnormal, by institute
State unassignable target operand in instruction and be entered as null value；Transport in the second judge module 200 decision instruction
When calculation does not exists abnormal, the result of described ordering calculation is assigned to target operand；
3rd judge module 400, for the first judge module 100 judge described source operand illegal or
When person's processing module 300 assignment operation completes, it may be judged whether performed all of instruction；If so,
Then terminate this browser script to resolve, otherwise next instruction is set as present instruction, and by
First judge module 100 continues executing with the source operand obtaining present instruction, it is judged that whether source operand closes
The operation of method.
In the present embodiment, after the source operand of the first judge module 100 decision instruction is legal, will be by
Two judge modules 200 carry out ordering calculation, if mistake occurs in computing, then can generate the exception of correspondence, should
Extremely comprise error message, and be saved in a global variable.Then by calling an abnormality detection letter
Number inquiry abnormal information, thus judge whether mistake occurs during carrying out ordering calculation.If existing
Abnormal, then by processing module 300 target operand unassignable in instruction is entered as null value, and by the
Three judge modules 400 perform to judge whether to have performed the operation of all of instruction；If there is not exception,
Then by processing module 300, the result of ordering calculation is assigned to target operand, and by the 3rd judge module
400 perform to judge whether to have performed the operation of all of instruction.It should be noted that, in the present embodiment,
The exception that above-mentioned ordering calculation produces is specially when operational order computing, does not finds source operand corresponding
Attribute or method, or the type of source operand or scope do not meet the requirement of instruction.Mould is judged first
After the source operand of block 100 decision instruction is illegal, then performed to judge whether by the 3rd judge module 400
Perform the operation of all of instruction.
The source operand that the present invention is instructed by acquisition, first has the first judge module 100 to judge that this source is grasped
The legitimacy counted, and directly skip under present instruction is directly entered in the case of source operand is illegal
Article one, the execution of instruction, in the case of source operand is legal, is judged to perform by the second judge module 200
Whether exception is there is, if existing abnormal, then by processing module 300 by unassignable target after order fulfillment
Operand is entered as null value, and secondly throw exception performs next instruction；If there is not exception, then by
Result after ordering calculation is assigned to target operand by reason module 300, secondly performs next instruction.
What therefore the present invention occurred when can effectively prevent the script language files in browser resolves webpage is less or secondary
The script syntax error wanted and affect the normal browsing of webpage, thus improve practicality.
Further, the above-mentioned device realizing browser script language execution fault tolerance also includes:
Decoder module 500, being used for downloading the file decoding containing script-language program from server end is phase
The script character string answered；
Analyze module 600, for according to morphology and syntactic analysis decoded script character string, generate
Bytecode.
It should be noted that, the job sequence that above-mentioned bytecode is made up of operation code and operand；Browse
Device resolver will perform each instruction of bytecode the most one by one.When the first judge module 100 obtains
After the source operand of instruction, the first judge module 100 will determine that the legitimacy of acquired source operand.
It is the structural representation of processing module in Fig. 4 in conjunction with reference Fig. 5, Fig. 5.Based on above-described embodiment,
In the present embodiment, above-mentioned processing module 300 includes:
First judging unit 301, is used for judging whether comprise target operand in described instruction；
Second judging unit 302, for comprising target operand in the first judging unit 301 decision instruction
Time, it is judged that whether described target operand is assigned；
Processing unit 303, is used for when the second judging unit judges that described target operand is not assigned, will
Described target operand is entered as null value, and is continued executing with by described 3rd judge module 400 and judge whether
Perform the operation of all of instruction.
In the present embodiment, judge after ordering calculation terminates, there are abnormal feelings by the second judge module 200
Under condition, it is primarily due to the first judging unit 301 judges whether comprise object run in the execution currently performed
Number, if there is not target operand, is then continued executing with by described 3rd judge module 400 and judges whether
Through having performed the operation of all of instruction.In the case of there is target operand, by the second judging unit
302 judge whether target operand is assigned, if target operand has been assigned, are then sentenced by the described 3rd
Disconnected module 400 continues executing with the operation judging whether to have performed all of instruction；If target operand
It is not assigned, then by processing unit, target operand is entered as null value, then judged mould by the described 3rd
Block 400 continues executing with the operation judging whether to have performed all of instruction.
These are only the preferred embodiments of the present invention, not thereby limit the scope of the claims of the present invention, every
Utilize equivalent structure or equivalence flow process conversion that description of the invention and accompanying drawing content made, or directly or
Connect and be used in other relevant technical fields, be the most in like manner included in the scope of patent protection of the present invention.
Claims (10)
1. the method realizing browser script language execution fault tolerance, it is characterised in that include following step
Rapid:
A, when starting to perform instruction, obtains the source operand of present instruction, it is judged that whether source operand closes
Method；The most then perform step B, otherwise perform step E；
B, carries out ordering calculation, and decision instruction computing terminate after whether there is exception；The most then hold
Row step C, otherwise performs step D；
C, is entered as null value by target operand unassignable in described instruction；And perform step E；
D, is assigned to target operand by the result of described ordering calculation；And perform step E；
E, it may be judged whether performed all of instruction；The most then terminate this browser script language
Speech resolves, and next instruction is otherwise set as present instruction, and returns execution step A.
The method realizing browser script language execution fault tolerance the most as claimed in claim 1, it is characterised in that
, also included before performing described step A:
It is corresponding script word by downloading the file decoding containing script-language program from server end
Symbol string；
According to morphology and syntactic analysis decoded script character string, generate bytecode.
The method realizing browser script language execution fault tolerance the most as claimed in claim 1, it is characterised in that
, described step C specifically includes:
C1, it is judged that whether comprise target operand in described instruction；The most then perform step C2, no
Then perform step E；
C2, it is judged that whether described target operand is assigned；The most then perform step E, otherwise perform
Step C3；
C3, is entered as null value by described target operand, and performs step E.
The method realizing browser script language execution fault tolerance the most as claimed any one in claims 1 to 3
, it is characterised in that described judge that source operand is the most legal particularly as follows: judge that source operand is
No is empty.
The method realizing browser script language execution fault tolerance the most as claimed any one in claims 1 to 3
, it is characterised in that the exception that described ordering calculation produces is: attribute that source operand is corresponding or
Method does not finds, or the type of source operand or scope do not meet the requirement of instruction.
6. the device realizing browser script language execution fault tolerance, it is characterised in that including:
First judge module, for when starting to perform instruction, obtains the source operand of present instruction,
Judge that source operand is the most legal；
Second judge module, for when the first judge module judges that described source operand is legal, is carried out
Ordering calculation, and decision instruction computing terminate after whether there is exception；
Processing module, for when the second judge module decision instruction computing exists abnormal, by described finger
In order, unassignable target operand is entered as null value；In the second judge module decision instruction computing
When not existing abnormal, the result of described ordering calculation is assigned to target operand；
At the first judge module, 3rd judge module, for judging that described source operand is illegal or locates
When reason module assignment operation completes, it may be judged whether performed all of instruction；The most then
Terminate this browser script to resolve, otherwise next instruction be set as present instruction,
And the source operand of acquisition present instruction is continued executing with by the first judge module, it is judged that source operand
The most legal operation.
Realize the device of browser script language execution fault tolerance the most as claimed in claim 6, it is characterised in that
, the described device realizing browser script language execution fault tolerance also includes:
Decoder module, being used for downloading the file decoding containing script-language program from server end is phase
The script character string answered；
Analyze module, for according to morphology and syntactic analysis decoded script character string and raw
Become bytecode.
Realize the device of browser script language execution fault tolerance the most as claimed in claim 6, it is characterised in that
, described processing module includes:
First judging unit, is used for judging whether comprise target operand in described instruction；
Second judging unit, in time comprising target operand in the first judging unit decision instruction,
Judge whether described target operand is assigned；
Processing unit, is used for when the second judging unit judges that described target operand is not assigned, will
Described target operand is entered as null value, and is continued executing with judgement by described 3rd judge module and be
The no operation having performed all of instruction.
9. the device realizing browser script language execution fault tolerance as according to any one of claim 6 to 8
, it is characterised in that described first judge module is used for judging whether source operand is empty.
10. the device realizing browser script language execution fault tolerance as according to any one of claim 6 to 8
, it is characterised in that the exception that described ordering calculation produces is: attribute that source operand is corresponding or
Method does not finds, or the type of source operand or scope do not meet the requirement of instruction.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101183335A (en) * | 2007-12-25 | 2008-05-21 | 中兴通讯股份有限公司 | Method and system for realizing embedded software unconventionality testing |
| CN101715086A (en) * | 2008-10-07 | 2010-05-26 | 中兴通讯股份有限公司 | Error correction processing method for internet protocol television set top box |
| CN102202242A (en) * | 2011-05-19 | 2011-09-28 | 广东星海数字家庭产业技术研究院有限公司 | Realization method of JavaScript interpreter based on set-top box browser |
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| US7120898B2 (en) * | 2003-06-26 | 2006-10-10 | Microsoft Corporation | Intermediate representation for multiple exception handling models |
| US7490268B2 (en) * | 2004-06-01 | 2009-02-10 | The Trustees Of Columbia University In The City Of New York | Methods and systems for repairing applications |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101183335A (en) * | 2007-12-25 | 2008-05-21 | 中兴通讯股份有限公司 | Method and system for realizing embedded software unconventionality testing |
| CN101715086A (en) * | 2008-10-07 | 2010-05-26 | 中兴通讯股份有限公司 | Error correction processing method for internet protocol television set top box |
| CN102202242A (en) * | 2011-05-19 | 2011-09-28 | 广东星海数字家庭产业技术研究院有限公司 | Realization method of JavaScript interpreter based on set-top box browser |
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