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showing results for - "check if something is a number"
Ilaria
09 Apr 2018
1
2<html>
3<head></head>
4<body>
5<h1>isNaN() example</h1>
6
7<script type="text/javascript">
8 var num1 = 100;
9 if(isNaN(num1)){
10    document.write(num1 + " is not a number <br/>");
11 }else{
12    document.write(num1 + " is a number <br/>");
13 }
14 
15 var str1 = "mkyong"
16 if(isNaN(str1)){
17    document.write(str1 + " is not a number <br/>");
18 }else{
19    document.write(str1 + " is a number <br/>");
20 }
21</script>
22
23</body>
24</html>
25
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