救命啊，简单的正则出现问题！

[gyx999]

var digit=/^[0-9]{1,20}$/;
alert(frm.Mailing_StreetNO.value)；//frm.Mailing_StreetNO.value的值为123
alert(digit.test(frm.Mailing_StreetNO.value));//false
alert(digit.test("123"));//true
目的就是要frm.Mailing_StreetNO.value的值是否为数字，怎么办呢？

[Yashmak]

alert(digit.test(String(frm.Mailing_StreetNO.value))

[saucer]

are you sure? do you have leading or trailing spaces??

try

alert(digit.test(frm.Mailing_StreetNO.value.replace(/^\s+|\s+$/g,"")))

the following works for me, you can also use IsNaN function


<form name="frm">
<input name="Mailing_StreetNO" value="123">
<input type=button value=check onclick="checkInput2()">
</form>
<script language=javascript>
function checkInput()
{
var digit=/^[0-9]{1,20}$/;
alert(frm.Mailing_StreetNO.value);
alert(digit.test(frm.Mailing_StreetNO.value));
alert(digit.test("123"));//true
}

function checkInput2()
{
alert (!isNaN(frm.Mailing_StreetNO.value));

}
</script>

[blues-star]

alert(digit.test(parseInt(frm.Mailing_StreetNO.value,10)+""));