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3w....学习.教学 > ASP > function » isnumeric

3w learning

function >
isnumeric

Title:

IsNumeric(expression)


IsNumeric(变量名称)
Description:

Build-in function IsNumeric(expression) return output True or False


辨识变量是否为数值
Example Code:

<% dim a, b a="555" b="word" response.write (IsNumeric(a)) response.write "<br>" response.write IsNumeric(b) response.write "<br>" if lcase(IsNumeric(b))<>"true" then w=100 else w=99 end if response.write w %>


为何使用:
为避免输入非数值的变量参与 + - * / 所设检查点
以避免无法运算而导致当机的可能或主机资源的消耗和错误的讯息

何时使用:
+ - * / 之运算前应该都设检查点
Example Result:


True False 100 ---------------------- tips -------- set the IsNumeric( ) check point before + - * /


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[ 7/27/2008 ]

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