<input onchange="TEST(this.value)">
<script language="javascript">
function TEST(V)
{
var objRegExp = new RegExp("(13[0-9]{1,1}[0-9]{8,8})|(^\[ \t]*$)","g");
alert(objRegExp.test(V));
}
</script>
<script language="javascript">
function TEST(V)
{
var objRegExp = new RegExp("(13[0-9]{1,1}[0-9]{8,8})|(^\[ \t]*$)","g");
alert(objRegExp.test(V));
}
</script>
判断