How to use undefined Property in JavaScript
This article describe about undefined Property in JavaScript.
undefined Property in JavaScript
If variable has not assigned value then it is indicated by the undefined property.
Example
|
<!DOCTYPE html>
<html>
<body>
<script type="text/javascript">
var a = "";
var b;
if (a == undefined) {
document.write("a is undefined");
}
if (b == undefined) {
document.write("b is undefined");
}
</script>
</body>
</html>
|
Output
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