By | August 7, 2013
All of us know function is a collection of statements that is executed when it is called at some point in a program. A function performs a specific task within a program independent of the rest code in the program. We can call the function from anywhere within a program. We can also define the parameters to be passed with function while calling the function. The parameters in a function are used to exchange information between a calling statement and function. We can define a function by using the function keyword.
Syntax for a function :

Above syntax has name of function, and parameters of a function.

JavaScript functions are divided into two categories:

Function without Parameters: Does not contain parameters. This code written in these function is static, implying that the values of members of these function cannot be changed at runtime.
Function with parameters:  Contains parameter in its parenthesis, such as integer and string. Unlike function without parameters, the values of members of these function can be changed at run time by passing different values of their parameters.

Now let’s understand the JavaScript function using a simple example:

We have created a function named simple under the head section.

The simple() function an alert message with Thank you.

The onload event handler under the BODY element calls simple() function when the document is loaded in the browser.
Output :

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