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JavaScript undefined Property
 Complete Function Reference
Definition and Usage
The undefined property indicates that a variable has not been assigned a value.Syntax
Example
In this example we will test two variables to find out if one of them is
undefined:
<script type="text/javascript">
var t1="";
var t2;
if (t1==undefined)
{
document.write("t1 is undefined");
}
if (t2==undefined)
{
document.write("t2 is undefined");
}
</script>
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The output of the code above will be:
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Complete Function Reference
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