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This article mainly explains "how to use the try and catch sentences of JavaScript". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "how to use the try and catch sentences of JavaScript".

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.

The JavaScript statements try and catch appear in pairs.

Grammar

Try {

. / / exception thrown

} catch (e) {

. / / exception capture and handling

} finally {

... / / end processing.

}

Example

In the following example, we deliberately wrote a wrong word in the code of the try block.

The catch block catches the error in the try block and executes the code to handle it.

Example

Var txt= ""

Function message ()

{

Try {

Adddlert ("Welcome guest!")

} catch (err) {

Txt= "there is an error on this page.\ n\ n"

Txt+= "error description:" + err.message + "\ n\ n"

Txt+= "Click OK to continue.\ n\ n"

Alert (txt)

}

}

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