Level no.23

 JAVA-SCRIPT

Lecture #1

Java-script is widely used programming language used for web developers.It is object-oriented programming language used my developers to make wed pages interactive. It is used for creating dynamically updated content. Java-script is used for animated graphics. 

Syntax:

<!DOCTYPE html>

<head>

<title></title>

</head>

<body>

</body>

<script>

document.write(" enter your text here ")

</script>

</html>

document.write("  ") is used in  java-script for printing text on screen. This term is written between <script> </script>.

Code:

<!DOCTYPE html>

<head>

<title></title>

</head>

<body>

</body>

<script>

document.write(" Hello Coding  ")

</script>

</html>

Output:

Hello Coding 


Declare Variable in Java-Script

To declare variable in java-script. The term " var " is used. 

Syntax:

var variable name

Code:

<!DOCTYPE html>

<head>

<title></title>

</head>

<body>

</body>

<script>

var number=100

document.write(" The number is " +number)

</script>

</html>


Output:

The number is 100


What is concatenation in Java-script?

It is used for combining two or more strings to create a new string. It allows you to join text or string variables to create a new string. In java-script  you can concatenate string using the " + " operator. Here is the example to how's it woks:

<!DOCTYPE html>

<head>

<title></title>

</head>

<body>

</body>

<script>

var num1=10

var num2=20

document.write(" First number is " +num1+ " Second number is " +num2)

</script>

</html>

In this example num1 and num2 are concatenated.

Output:

First number is 10 Second number is 20.


How to take data from the user in Java-script?

To take data from the user the term "prompt"  is used.

Code:

<!DOCTYPE html>

<head>

<title></title>

</head>

<body>

</body>

<script>

var num1=prompt("enter first number")

 var num2=prompt("enter second number")

document.write(" First number is " +num1+ " Second number is " +num2)

</script>

</html>


This code  will take 2 numbers from the user.




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