问一个正则表达式

Question

<asp:TextBox ID="txtampwarning" runat="server" Width="154px" CssClass="input_200" onafterpaste="this.value=this.value.replace(/\D/g,'')" onkeyup="this.value=this.value.replace(/\D/g,'')"></asp:TextBox>
这个是限制正整数的输入。想问问只限制整数如何实现？

Answer 1

<asp:TextBox ID="txtampwarning" runat="server" Width="154px" CssClass="input_200" onafterpaste="this.value=this.value.replace(/^([+-])?\D/g,'')" onkeyup="this.value=this.value.replace(/^([+-])?\D/g,'')"></asp:TextBox>