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try...catch statement creates a statement block for check and specifies that an exception response should be returned.
statements to execute.
Instruction to execute if an exception occurs in the
Another identifier containing the target of the exception for the associated object. Block
The statements are executed after the completion of the
try confirmation. it The statements are executed regardless of whether an exception is thrown or caught.
try_statementscatch(exception_variable) catch_statementsfinally final_statements
try block containing or other statements.
must always be used, even for individual declarations. The
catch block, the
finally block, or both must actually exist. This gives three forms for the
try... catch... finally
catch block contains many instructions that tell you what to do when an exception occurs. will run in every
try block. If the statement dies just in a
try block (or when doing a job called inside a
try block) throws an exception, control now passes to the
catch block. When no exception is thrown in your
catch block jumped up.
finally block always comes after the
try block and Blocks
catch catch Execution completed. It always spins no matter what whether the miss was thrown or caught.
You can nest one or more
try statements. If inner
try There is no note in the noteAn outer
catch block, but wrapped in a
try You can use the
catch statement block instead.
You can now also use the
If perhaps a
catch block is used, the
catch block will be run if each exception is simply thrown inside a
try block. For example, if Exception The port of the following code occurs, control passes to Block
catch block specifies an identifier (
e in the entire example). above), which consists of the exception value; this value type is only accessible from the point of view The scope of the
throw "my exception"; fire log errors (e);
You can create "conditional
catch blocks" by combining -
if...else if...else structures such as This:
A common use case is to capture (and obliteratevalue) of only a small expected subset. errors, and then re-throw certain errors in other cases:
my daily duties(); connector no matter (e.g. TypeError instance) greater than if (e.g. RangeError instance) other than dir if (e.g. instance of EvalError) log errors (e);
My daily duties(); connector if (th instance of RangeError) totally different threw it;
If an exception occurs in the
exception_var (i.e. your
catch(e)) most of them are of exceptional value. You can use this id to get information on this subject An exception that appears to have been thrown. This identifier is only available in The scope of the
catch block. If you don't need it Exclusive relevance, may be omitted.
isValidJSON(text) function To attempt JSON.parse(text); make true catches a false return;
finally block containst directives to be provided after The
try block additionally executes the
catch blocks, but before slips after the
try...catch...finally block. Please note that most The
finally block is executed regardless of whether an exception is thrown. Also, when an exception is thrown that even extracts the statements from the
finally block if no
catch block handles each of our exceptions.
The following example shows an example of using the
finally block. The code opens the image, then executes the instructions that serve the file; it The
finally block ensures that the file is always closed after it has been used, even if it exists. An exception has been thrown.
openMyFile();To attempt writeMyFile(data); finally closeMyFile();
Well, if my husband and I have already caught the exception in the innermost
try block by adding Block
Any exception granted will, of course, only be introduced once by our nearest aviary. Block
catch if it doesn't run again. Of course, all amazing exceptions are thrown this "inner" block (because the code in