5.5.1 If…else Statements

If…else  statement performs an indicated action only when the condition n evaluates to true; otherwise that action is skipped.  The if…else selection statement allows you to specify that a different action is  to be performed when the condition is true than when the condition is false.

Syntax

If (condition)
{
Code to be executed if condition is true
}
else
{
code to be executed if condition is not true
}
× Forgetting one or both of the braces that delimit a block can lead to syntax error or logic error

 <html>
 <body>
 <script type = “text/ javascript”>
 Marks = 60;
 If (marks>60) 
{ 
Document.write (“you have passed!”); 
}
else {
 Document.write (“you failed”);
 } 
</script> 
</body> 
</html>
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