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This article mainly talks about "abnormal analysis of throw, try and catch in JavaScript". Interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn "throw, try and catch exception Analysis in JavaScript".

JavaScript exceptions-throw, try, and catch:

The try statement tests for errors in the code block.

The catch statement handles errors.

The throw statement creates a custom error.

JavaScript error:

Various errors occur when the JavaScript engine executes JavaScript code.

It can be a syntax error, usually a coding error or typos caused by a programmer.

It may be a spelling mistake or a missing feature in the language (may be due to browser differences).

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It may be an error caused by an incorrect output from the server or the user.

Of course, it may also be due to many other unpredictable factors.

When an error occurs, when something goes wrong, the JavaScript engine usually stops and generates an error message.

The technical term to describe this situation is: JavaScript will throw an error.

Try and catch:

The try statement allows us to define blocks of code that are tested for errors at execution time.

The catch statement allows us to define the block of code to execute when an error occurs in the block of try code.

Try and catch appear in pairs.

Syntax:

Try {

/ / run the code here

} catch (err) {

/ / handle errors here

}

Throw statement:

The throw statement allows us to create custom errors.

The correct technical term is to create or throw an exception.

If you use throw with try and catch, you can control the program flow and generate custom error messages.

Syntax:

Throw exception (exception)

At this point, I believe you have a deeper understanding of "throw, try and catch exception analysis in JavaScript". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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