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This article mainly introduces the relevant knowledge of how to define the JavaScript function, 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 to define the JavaScript function. Let's take a look.

JavaScript uses the keyword function to define functions.

A function can be defined by a declaration or an expression.

Function declaration

In the previous tutorial, you learned about the syntax of function declarations:

Function functionName (parameters) {

Executed code

}

The function will not be executed immediately after it is declared, but will be called when we need it.

Case study

Function myFunction (a _ r _ b) {

Return aquib

}

Note semicolons are used to separate executable JavaScript statements.

Because the function declaration is not an executable statement, it does not end with a semicolon.

Function expression

The JavaScript function can be defined by an expression.

Function expressions can be stored in variables:

Case study

Var x=function (aformab) {return aforb}

After a function expression is stored in a variable, the variable can also be used as a function:

Case study

Var x=function (aformab) {return aforb}

Var Zhonx (4pr 3)

The above function is actually an anonymous function (the function has no name).

Functions are stored in variables, do not require a function name, and are usually called through the variable name.

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

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