What is If statement in JavaScript?
If statement is conditional statement in JavaScript.It executes the 'if block' only when expression is true.
Syntax of If statement...
if(condition)
{
//number of statements
}
Example of if statement:
<html>
<head>
<title>if statement</title>
</head>
<body>
<script>
var num=5;
if(num==5)
{
document.write("Welcome to compuhelp");
}
</script>
</body>
</html>
Output
In the above example, the value of num is 5 and when control check the if statement it will be true and give the above output.
Example of if statement Using prompt() function:
<html>
<head>
<title>if statement</title>
</head>
<body>
<script>
var num;
num=prompt("Enter a number ");
if(num>0)
{
document.write("number is positive");
}
</script>
</body>
</html>
Output
Enter a number 4
number is positive
In the above example, if the user enters 4 then the control will come inside If statement and give the above output else it will quit the If statement.