如何判断输入的是两位数字

Question

function numtest(str)
{
 var parth=/^[0-9]{2}$/;
 if(!parth.test(str))
return false;
return true;
}

Answer 1

<script>
function aa(){
var a,b
a=document.form1.text1.vlaue
b=a.lenght
if (b==2){
   if ((a.substring(0,1))%2==0){
       if ((a.substring(1,2))%2=1){
            document.write("您输入的是2个数字")
                               }
                          }
           }
}
</script>

Answer 2

function save()
         { var saveyear=document.SetEditForm.saveyears.value;
           if (saveyear.search(/^[1-9][0-9]$/)!=-1) alert('是2位数字')         }

Answer 3

<input onblur="alert(/^\d{1,2}$/.test(this.value))">