首先Cookie失效分为两种:
(1)设置过期时间失效(只要设置了过期时间Cookie就会存储在硬盘里面)
(2)当会话结束时失效,即关闭浏览器窗口(如果没有设置Expires,Cookie就会存储在内存里面)
手动删除Cookie失效
下面给出个demo:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="TestCookie.aspx.cs" Inherits="LJWY_SP01_TestCookie" %> <!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>内存Cookie和硬盘Cookie</title> <script type="text/javascript" runat=server> //内存 protected void btn_cookie_1_Click(object sender, EventArgs e){ HttpCookie cookie=new HttpCookie("Memory"); cookie.Value = "内存存储"; HttpContext.Current.Response.AppendCookie(cookie); } //硬盘 protected void btn_cookie_2_Click(object sender, EventArgs e) { HttpCookie cookie=new HttpCookie("Hard disk"); cookie.Value = "硬盘存储"; cookie.Expires=System.DateTime.Now.AddDays(1); HttpContext.Current.Response.AppendCookie(cookie); } </script> </head> <body> <form id="form1" runat="server"> <div> <asp:Button ID="btn_cookie_1" runat="server" Text="内存Cookie" onclick="btn_cookie_1_Click"/> <asp:Button ID="btn_cookie_2" runat="server" Text="硬盘Cookie" onclick="btn_cookie_2_Click"/> </div> </form> </body> </html>在浏览器中设置-->高级-->隐私设置与安全-->内容-->Cookie里面可以看到浏览器占存的Cookie