为文本框绑定改变事件

1.只能输入正整数的js动态验证

　<script>
        $(function () {
            $("#TextBox1").bind(‘input propertychange‘, function () {
                var regEx = /^\d+(\.\d+)?$/;
                var strVal = $(this).val();
                if (regEx.test(strVal) == false) {
                    $(this).val($(this).val().substring(0, length - 1));
                };
            });
        });
    </script>

<asp:TextBox ID="TextBox1" Width="120px" runat="server"></asp:TextBox>