VBScript IsNumeric function
Complete VBScript Reference IsNumeric function returns a Boolean value indicating whether an expression specified can be calculated as a number. If the expression as the numbers to calculate returns True, otherwise False.
Note: If the expression is a date, IsNumeric function returns False.
grammar
IsNumeric(expression)
| 参数 | 描述 |
|---|---|
| expression | 必需。一个表达式。 |
Examples
Examples
<script type="text/vbscript">
Dim x
x=10
document.write(IsNumeric(x) & "<br />")
x=Empty
document.write(IsNumeric(x) & "<br />")
x=Null
document.write(IsNumeric(x) & "<br />")
x="10"
document.write(IsNumeric(x) & "<br />")
x="911 Help"
document.write(IsNumeric(x))
</script>
Dim x
x=10
document.write(IsNumeric(x) & "<br />")
x=Empty
document.write(IsNumeric(x) & "<br />")
x=Null
document.write(IsNumeric(x) & "<br />")
x="10"
document.write(IsNumeric(x) & "<br />")
x="911 Help"
document.write(IsNumeric(x))
</script>
Examples of the above output:
True
True
False
True
False
True
False
True
False
try it"
Complete VBScript Reference