如何测试变量是否为数字? [英] How to test if a variable is numeric?
问题描述
伙计,
我有一个盒子需要数字输入 - 我想测试它(是的,
我也会进行服务端检查,但也需要客户检查。)
如何测试我的输入是数字的 - 数字可能意味着
正数或负数浮动数
例如:对于1,1.5,-1,-4.25返回true并返回任何
其他的false非数字输入...
谢谢
Randell D.
< blockquote> Randell D.写道:
伙计,
我有一个盒子,需要数字输入 - 我想测试它(是的,
我也会进行服务端检查,但也需要客户端检查。
如何测试我的输入是数字的 - 数字可能意味着
正或负浮动数字
例如:对于1,1.5,-1,-4.25返回true,并为任何
返回false其他非数字输入...
感谢
Randell D。
我想你会找到你想要的任何东西这里:
< URL:http://www.merlyn.demon.co.uk/js-valid.htm#Val>
-
Rob
>例如:对于任何其他非数字输入,返回true为1,1.5,-1,-4.25并返回false ...
typeof value ==''number''
如果你不担心NaN或Infinity就很好。如果你是,那么
typeof value ==''number''&& isFinite(value)
更好。
http://www.crockford.com/javascript/remedial.html
Douglas Crockford写道:
例如:对于1,1.5,-1,-4.25返回true,并为
任何其他非数字输入返回false ...
typeof value ==''number''
如果你不担心NaN或Infinity就很好。如果你是,那么
typeof value ==''number''&& isFinite(value)
更好。
http://www.crockford.com/javascript/remedial.html
谢谢 - 我找到了typeof的参考但是没有'我很确定如何使用它...
干杯
randell d。
Folks,
I have a box that expects numeric input - I''d like to test for it (yeah,
I''ll have service side checks too but also want client checks).
How can I test that my input is numeric - and numeric could mean
positive or negative floating numbers
For example: return true for 1, 1.5, -1, -4.25 and return false for any
other non-numeric input...
Thanks
Randell D.
Randell D. wrote:
Folks,
I have a box that expects numeric input - I''d like to test for it (yeah,
I''ll have service side checks too but also want client checks).
How can I test that my input is numeric - and numeric could mean
positive or negative floating numbers
For example: return true for 1, 1.5, -1, -4.25 and return false for any
other non-numeric input...
Thanks
Randell D.
I think you''ll find whatever you want here:
<URL:http://www.merlyn.demon.co.uk/js-valid.htm#Val>
--
Rob
> For example: return true for 1, 1.5, -1, -4.25 and return false for anyother non-numeric input...
typeof value == ''number''
is good if you are not worried about NaN or Infinity. If you are, then
typeof value == ''number'' && isFinite(value)
is better.
http://www.crockford.com/javascript/remedial.html
Douglas Crockford wrote:
For example: return true for 1, 1.5, -1, -4.25 and return false for
any other non-numeric input...
typeof value == ''number''
is good if you are not worried about NaN or Infinity. If you are, then
typeof value == ''number'' && isFinite(value)
is better.
http://www.crockford.com/javascript/remedial.html
Thanks - I found reference of typeof but wasn''t quite sure how to use it...
Cheers
randell d.
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