Check Undefined in JavaScript

Check Undefined in JavaScript

Run

<html>
<head>
<title>Javascript Demo</title>
<script type="text/javascript">
function checkUndefined() {
 if(typeof my_var === 'undefined' ){
alert("undefined variable");
}
}
</script>
</head>
<body>
<a href="javascript:void(0)" onclick="checkUndefined()">Check </a>
</body>
</html>

<html>
<head>
<title>Javascript Demo</title>
<script type="text/javascript">
function checkUndefined() {
 if(typeof my_var === 'undefined' ){
alert("undefined variable");
}
}
</script>
</head>
<body>
<a href="javascript:void(0)" onclick="checkUndefined()">Check </a>
</body>
</html>

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