文本框只能输入整数，输入其他的自动不显示

  <asp:TextBox ID="txtpx" runat="server" CssClass="inp" Width="71px" onkeyup="if(this.value.length==1){this.value=this.value.replace(/[^1-9]/g,'')}else{this.value=this.value.replace(/D/g,'')}"
                                        onafterpaste="if(this.value.length==1){this.value=this.value.replace(/[^1-9]/g,'0')}else{this.value=this.value.replace(/D/g,'')}"></asp:TextBox>