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This article mainly introduces the relevant knowledge of how the JavaScript function is called, the content is detailed and easy to understand, the operation is simple and fast, and has a certain reference value. I believe you will gain something after reading this article on how the JavaScript function is called. Let's take a look at it.

JavaScript functions are blocks of code designed to perform specific tasks.

The JavaScript function is executed when some code calls it.

Example:

Function myFunction (p1, p2) {

Return p1 * p2; / / this function returns the product of p1 and p2.

}

Function syntax

The JavaScript function is defined by the function keyword, followed by the function name and parentheses ().

Function names can contain letters, numbers, underscores, and dollar signs (rules are the same as variable names).

Example:

Function name (parameter 1, parameter 2, parameter 3) {

Code to be executed

}

Function call

The code in the function will be executed when other code calls the function:

When the event occurs (when the user clicks the button)

When the JavaScript code calls

Automatic (self-calling)

Function return

When JavaScript reaches the return statement, the function stops execution.

If the function is called by a statement, JavaScript will "return" to execute the code after the calling statement.

Function usually calculates the return value. This return value is returned to the caller:

Example:

Calculates the product of two numbers and returns the result:

The result of x will be: 40

Expand:

Es6 custom function: (arrow function)

Syntax:

Var fn = () = > {

}

This is the end of the article on "how the JavaScript function is called". Thank you for reading! I believe that everyone has a certain understanding of the knowledge of "how the JavaScript function is called". If you want to learn more, you are welcome to follow the industry information channel.

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