If Statement

If Statement

Syntax
if(condition)
{
     // execute this block if condition is true 
}

Conditional statements are used to perform different actions based on different conditions.
1. If statements are also known as conditional statements. This simply means that they are able to take action based on various conditions.
2. If statements is used to check whether specified condition is true or false.
3. If statements allows the computer to make decisions based on the values of variables which can take the specified action based on the input that is given.

Example: 1

<script type="text/javascript">
var num1=20;
var num2=30;
if (num1<num2)
  {
    alert("This line will show on browser");
   }
</script>

Example: 2

<script type="text/javascript">
var num1=20;
var num2=30;
if (num2<num1)
  {
    alert("This line will not show on browser");
   }
</script>

The browser will show the following :
Nothing. Because, the condition is false and 30 is greater than 20.