日前做到一个需求.net后台获取js返回值，根据前台获取yes or no，后台执行不同业务逻辑。
解决方案:后台业务逻辑写入第三方页面，前台脚本使用JQ Ajax请求。
DEMO：点击按钮弹出Confirm，Sure加法运算，Cancel减法运算，运算逻辑写于第三方页面。
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Demo_ReturnConfirm.aspx.cs" Inherits="ClientTest.Demo_ReturnConfirm" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<script src="js/jquery-2.1.0.js"></script>
<script type="text/javascript">
function operate() {
var p_one = $("#txtOne").val();
var p_two = $("#txtTwo").val();
var a = confirm("点击确定加法运算，取消减法运算");
if (a == true) {
$.ajax({
type: "Get", //访问WebService使用Post方式请求
url: "index.aspx", //调用WebService
data: 'type=Add&p_one=' + p_one + '&p_two=' + p_two,
dataType: 'html',
// cache: false,
//beforeSend: function (x) { x.setRequestHeader("Content-Type", "application/json; charset=utf-8"); },
error: function (x, e) { alert("Error:" + x + e) },
success: function (result) { //回调函数，result，返回值
alert(result);
}
});
}
else {
$.ajax({
type: "Get", //访问WebService使用Post方式请求
url: "index.aspx", //调用WebService
data: 'type=Cut&p_one=' + p_one + '&p_two=' + p_two,
dataType: 'html',
//cache: false,
//beforeSend: function (x) { x.setRequestHeader("Content-Type", "application/json; charset=utf-8"); },
error: function (x, e) { alert("Error:" + x + e) },
success: function (result) { //回调函数，result，返回值
alert(result);
}
});
}
return false;
};
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="txtOne" runat="server"></asp:TextBox>
<asp:TextBox ID="txtTwo" runat="server"></asp:TextBox>
<asp:Button ID="BtnSure" runat="server" Text="Operate" OnClientClick=" return operate()" />
</div>
</form>
</body>
</html>
public partial class Index : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (Request.QueryString["type"] == "Add" && Request.QueryString["p_one"] != null && Request.QueryString["p_two"] != null)
{
Response.Write(Operate_Add(Convert.ToInt32(Request.QueryString["p_one"].ToString()), Convert.ToInt32(Request.QueryString["p_two"].ToString())));
Response.End();
}
if (Request.QueryString["type"] == "Cut" && Request.QueryString["p_one"] != null && Request.QueryString["p_two"] != null)
{
Response.Write(Operate_Cut(Convert.ToInt32(Request.QueryString["p_one"].ToString()), Convert.ToInt32(Request.QueryString["p_two"].ToString())));
Response.End();
}
}
private string Operate_Add(int p_one, int p_two)
{
return (p_one + p_two).ToString();
}
private string Operate_Cut(int p_one, int p_two)
{
return (p_one - p_two).ToString();
}
}