如果你在Yahoo中搜索“中国”，那么在浏览器的地址栏将得到这样一串地址：http://search.cn.yahoo.com/search?ei=gbk&fr=fp-tab-web-ycn&meta=vl%
3Dlang_zh-CN%26vl%3Dlang_zh-TW&pid=ysearch&source=ysearch_www_hp_button
&p=%D6%D0%B9%FA&Submit=
看上去有些乱了，简化一下：http://search.cn.yahoo.com/search?&p=%D6%D0%B9%FA
这就是关键.其中&p=%D6%D0%B9%FA是搜索的关键字参数，而%D6%D0%B9%FA是“中国”的
Url编码。OK，我们只要能构造出这样的编码就好了。
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Search.aspx.cs" Inherits="Search" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Search</title>
<script language="javascript" type="text/javascript">
// <!CDATA[
function GetEncodeOfKey()
{
var strKey = window.document.getElementById("Text_Key").value;
return encodeURIComponent(strKey);
}
function GetUrl(site)
{
var encode=GetEncodeOfKey();
//web
if(document.getElementById("RadioButtonList_Kind_0").checked)
{
if(site=="google")
{
return "http://www.google.com/search?q="+encode+"&ei=UTF-8";
}
else
{
return "http://search.yahoo.com/search?p="+encode+"&ei=UTF-8";
}
}
//mp3
else if(document.getElementById("RadioButtonList_Kind_1").checked)
{
if(site=="google")
{
return "http://www.google.com/search?q="+encode+" mp3"+"&ei=UTF-8";
}
else
{
return "http://audio.search.yahoo.com/search/audio?&p="+encode+"&ei=UTF-8";
}
}
//img
else if(document.getElementById("RadioButtonList_Kind_2").checked)
{
if(site=="google")
{
return "http://images.google.com/images?q="+encode+"&ei=UTF-8";
}
else
{
return "http://images.search.yahoo.com/search/images?p="+encode+"&ei=UTF-8";
}
}
else
{
//alert("err");
}
}
function Button_Google_onclick()
{
window.open(GetUrl("google"));
}
function Button_Yahoo_onclick()
{
window.open(GetUrl("yahoo"));
}
// ]]>
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<br />
<br />
<strong><span style="font-size: 24pt; color: #336633">Search<br />
</span></strong>
</div>
<hr style="position: relative" />
<br />
<table style="left: 0px; position: relative; top: 0px">
<tr>
<td style="width: 31px; height: 21px">
<span style="font-family: Terminal">Key</span></td>
<td style="width: 253px; height: 21px">
<input id="Text_Key" style="width: 248px; position: relative" type="text" /></td>
<td style="width: 175px; height: 21px">
<asp:RadioButtonList ID="RadioButtonList_Kind" runat="server" RepeatDirection="Horizontal"
Style="position: relative" Font-Names="terminal">
<asp:ListItem Selected="True">Web</asp:ListItem>
<asp:ListItem>Mp3</asp:ListItem>
<asp:ListItem>Image</asp:ListItem>
</asp:RadioButtonList></td>
</tr>
<tr>
<td style="width: 31px">
</td>
<td colspan="2">
<input id="Button_Google" style="width: 80px; position: relative" type="button" value="Google" onclick="return Button_Google_onclick()" />
<input id="Button_Yahoo" style="left: -29px; width: 104px; position: relative" type="button"
value="Yahoo!" onclick="return Button_Yahoo_onclick()" /></td>
</table>
<br />
<hr style="position: relative" />
<asp:HyperLink ID="HyperLink_Home" runat="server" NavigateUrl="~/Default.aspx" Style="position: relative">Home</asp:HyperLink></form>
</body>
</html>
