It supports in all browsers.
isNaN(123); // false -- 123 is a number isNaN(1.23); // false -- 1.23 is a number isNaN(12 - 3); // false -- 12-3 = 9 is a number isNaN(0); // false -- 0 is a number isNaN('3S'); // true -- 3S is not a number but string so not a number isNaN('abcd'); // true -- abcd is a string so not a number isNaN('01/02/20013'); // true -- 01/02/20013 is a date so not a number isNaN('01:02:03'); // true -- 01:02:03 is time so not a number var a; var b; // value not defined isNaN(a/b); // true a=10; isNaN(a/b); // true -- because b is not defined b=5; isNaN(a/b); // false -- a/b=10/5 = 2 is a number var a= [1, 2, 3,4,5,]; var b; // not initialized for(i=0; i<a.length; i++) b = b + a[i] isNaN(b); // true -- because b is undefined.
b was not initialize before the loop start, so b is undefined so undefined + any value = undefined
|By Jason Olivera On 30 Mar, 13 Viewed: 414|
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