JavaScript undefined Property
Definition and Usage
The undefined property indicates that a variable has not been assigned a value.Syntax
undefined |
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> |
The output of the code above will be:
t2 is undefined |
JavaScript undefined Property
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