strNumber = formnumbervalue;
if (strNumber == )
{
alert(请输入您的ID号！);
formnumberfocus();
return (false);
}
if (strNumberlength < || strNumberlength > )
{
alert(您的ID号长度不正确必须在 位之间！);
formnumberfocus();
return (false);
}
for (index=; index<strNumberlength; index++)
{
check = strNumbercharAt(index);
if (!(digit(check) || alpha(check)))
{
alert(ID号只能使用字母或数字！);
formnumberfocus();
return false;
}
}
//检查输入项是否为数字
function digit(check)
{
return ((<=check) && (check<=));
}
//检查输入项是否为字母
function alpha(check)
{
return (((a<=check) && (check<=z)) || ((A<=check) && (check<=Z)))
}
//>
