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saucer大虾，谢谢你的回答，可是好象不行啊，我在窗体中的任何一个textbox里面回车的时候，都总是触发Button1的Click事件，这是怎么回事？
<script language="javascript">
function document.onkeydown()
{
  var e = event.srcElement;
  if (event.keyCode == 13)
  {
       if (e.id == "textBox1")
           document.all("Button1").click();
       else if (e.id == "textBox2")
           document.all("Button2").click();
       else
           event.keyCode = 0;
  }
}
</script>
saucer(思归, MS .NET MVP) 大虾，还是不行啊，我要疯了！要不你自己试试你的方法，我这里不行啊，我是这样的，在HTML代码里面直接把你给我的代码拷贝进去，难道这样不对吗？还望不吝赐教！
这样吧，saucer(思归, MS .NET MVP)大虾，我把我HTML的代码和WebForm1.aspx.cs的代码全部拷出来给你看看，到底应该怎么做，谢谢！
HTML：<%@ Page language="c#" Codebehind="WebForm1.aspx.cs" AutoEventWireup="false" Inherits="WebApplication2.WebForm1" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>WebForm1</title>
<meta name="GENERATOR" Content="Microsoft Visual Studio 7.0">
<meta name="CODE_LANGUAGE" Content="C#">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
<script language="javascript">function document.onkeydown()
{
  var e = event.srcElement;
  if (event.keyCode == 13)
  {
       if (e.id == "textBox1")
           document.all("Button1").click();
       else if (e.id == "textBox2")
           document.all("Button2").click();
       else
           event.keyCode = 0;
  }
} </script>
</HEAD>
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" runat="server">
<asp:Button id="Button1" style="Z-INDEX: 101; LEFT: 186px; POSITION: absolute; TOP: 88px" runat="server" Text="Button"></asp:Button>
<asp:Button id="Button2" style="Z-INDEX: 102; LEFT: 412px; POSITION: absolute; TOP: 96px" runat="server" Text="Button"></asp:Button>
<asp:TextBox id="textBox1" style="Z-INDEX: 103; LEFT: 135px; POSITION: absolute; TOP: 191px" runat="server"></asp:TextBox>
<asp:TextBox id="textBox2" style="Z-INDEX: 104; LEFT: 346px; POSITION: absolute; TOP: 190px" runat="server"></asp:TextBox>
</form>
</body>
</HTML>CS：
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;namespace WebApplication2
{
/// <summary>
/// WebForm1 的摘要说明。
/// </summary>
public class WebForm1 : System.Web.UI.Page
{
protected System.Web.UI.WebControls.Button Button1;
protected System.Web.UI.WebControls.TextBox textBox1;
protected System.Web.UI.WebControls.TextBox textBox2;
protected System.Web.UI.WebControls.Button Button2;

private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
} #region Web Form Designer generated code
override protected void OnInit(EventArgs e)
{
//
// CODEGEN：该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}

/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.Button1.Click += new System.EventHandler(this.Button1_Click);
this.Button2.Click += new System.EventHandler(this.Button2_Click);
this.Load += new System.EventHandler(this.Page_Load); }
#endregion private void Button1_Click(object sender, System.EventArgs e)
{
this.textBox1.Text="zhuohs";
} private void Button2_Click(object sender, System.EventArgs e)
{
this.textBox2.Text="linhao";
}
}
}
sorry, try
<script language="c#" runat="server">
void Button_Click(Object o, EventArgs e)
{
Button b = (Button)o;
Response.Write("***" + b.ID + " is clicked****");
}
</script>
<form runat="server">
Text1:<asp:TextBox id="textBox1" runat="Server" />
Text2:<asp:TextBox id="textBox2" runat="Server" />
<asp:Button id="Button1" runat="Server" Text="Button1" Onclick="Button_Click" />
<asp:Button id="Button2" runat="Server" Text="Button2" Onclick="Button_Click" />
</form>
<script language="javascript">
function document.onkeydown()
{
  var e = event.srcElement;
alert(e.id);
  if (event.keyCode == 13)
  {
       if (e.id == "textBox1")
           document.all("Button1").click();
       else if (e.id == "textBox2")
           document.all("Button2").click();
       else
           event.keyCode = 0; event.cancelBubble = true;
event.returnValue = false;
  }
}
</script>
在美国现在是什么时间啊
mvp？