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Saturday, 14 January 2017

Function is Javascript with example

Function is just way to reuse the code which can be called anywhere in the program.
Definition : A javascript function is a block of code designed to perform a perticular task.
Note : To define a javascript function, use the function keyword followed by name & set of paraemeter.
Syntax of function :
<script type = "text/javascript">
function function_name(function parameter)
{
function body
}
</script>
Example : In this example we will call the function from a button
<html>
<head>
<title> Welcome to learing nation</title> <script type = "text/javascript"> function chandan()
{
alert("i have been called");
}
</script>
</head>
<body>
<input type = "button" value = "Submit" onclick = "chandan()">
</body>
</html>
Output : i have been called.
Function Return : Use the return statement to return a value
Example : In this example first function will return the value to the second function :
<html>
<head>
<title> Welcome to learing nation</title>
<script type = "text/javascript">
function chandan(a,b)
{
var c = a * b;
return c;
}
function csc()
{
var x = prompt("Enter your first number");
var y = prompt("Enter your second number");
var z = chandan(x, y);
document.write("your answer is :" +z);
}
</script>
</head>
<body>
<input type = "button" value = "Submit" onclick = "csc()">
</body>
</html>
By at

3 comments:

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