<!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.111cn.net/tr/xhtml1/dtd/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=gb2312" />
<title>js 验证数字</title>
<script language="网页特效">
function checknum(num)
{//数字验证
var result=true;
if(num){
var myreg = new regexp("^0*[1-9]{1,1}[0-9]{0,4}$");//数字验证
result = myreg.test(num);
}
return result;
}
function check()
{
var num = document.getelementbyid('vnum').value;
if( num=='')
{
alert('请输入数字!');
}
else if(checknum(num) )
{
alert('不错,输入的全部为数字!');
}
else
{
alert('请输入数字!');
}
}
</script>
</head>
<body>
<form id="form1" name="form1" method="post" action="">
<label for="vnum"></label>
<input type="text" name="vnum" id="vnum" />
<input type="button" name="button" id="button" value="按钮" onclick="check();" />
</form>
</body>
</html>