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NaN |
Tip: Use the isNan() function to test a value to see if it is NaN.
提示:可以用isNan()方法测试一个值是否为NaN
In this example we will test two strings and find out if one of them is NaN:
在下面的例子中,我们将对两个值进行测试,找出非数字的值:
<script type="text/javascript"> var test1="300" document.write(Number(test1)+ "<br />") document.write(isNaN(test1)+ "<br />") </script> |
The output of the code above will be:
输出结果为:
NaN
How to use NaN to evaluate a number.
如何应用NaN来判断数字