Function

An important part of JavaScript is the ability to create new functions within <script> and </script> tag. Declare a function in JavaScript using function keyword. The keyword function precedes the name of the function.

Syntax

function functionName(parameter or not)
{
.........
.........
}

Example of JavaScript using Function

Example

<html>
<head>
<script>
function getname()
{
name=prompt("Enter Your Name");
alert("Welcome Mr/Mrs " + name);
}
</script>
</head>
<form>
<input type="button" value="Click" onclick="getname()"/>
</form>
</html>

Example