javascript如何操作cookie来实现用户登录代码实例详解

web前端|js教程

javascript,cookie,ie

web前端-js教程

很多登录功能上都有个“记住密码”的功能，其实无非就是对cookie的读取。

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下面展示这个功能的代码，测试方法：直接输入账号密码，提交后，刷新页面，再输入同样的账号，就可以显示

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window.onload=function onLoginLoaded() { if (isPostBack == "False") {GetLastUser(); } }function GetLastUser() { var id = "49BAC005-7D5B-4231-8CEA-16939BEACD67";//GUID标识符 var usr = GetCookie(id); if (usr != null) {document.getElementById( xtUserName).value = usr; } else {document.getElementById( xtUserName).value = "001"; } GetPwdAndChk(); } //点击登录时触发客户端事件function SetPwdAndChk() { //取用户名 var usr = document.getElementById( xtUserName).value; alert(usr); //将最后一个用户信息写入到Cookie SetLastUser(usr); //如果记住密码选项被选中 if (document.getElementById(chkRememberPwd).checked == true) {//取密码值var pwd = document.getElementById( xtPassword).value;alert(pwd);var expdate = new Date();expdate.setTime(expdate.getTime() + 14 * (24 * 60 * 60 * 1000));//将用户名和密码写入到CookieSetCookie(usr, pwd, expdate); } else {//如果没有选中记住密码,则立即过期ResetCookie(); } }function SetLastUser(usr) { var id = "49BAC005-7D5B-4231-8CEA-16939BEACD67"; var expdate = new Date(); //当前时间加上两周的时间 expdate.setTime(expdate.getTime() + 14 * (24 * 60 * 60 * 1000)); SetCookie(id, usr, expdate); } //用户名失去焦点时调用该方法function GetPwdAndChk() { var usr = document.getElementById( xtUserName).value; var pwd = GetCookie(usr); if (pwd != null) {document.getElementById(chkRememberPwd).checked = true;document.getElementById( xtPassword).value = pwd; } else {document.getElementById(chkRememberPwd).checked = false;document.getElementById( xtPassword).value = ""; } } //取Cookie的值function GetCookie(name) { var arg = name + "="; var alen = arg.length; var clen = document.cookie.length; var i = 0; while (i < clen) {var j = i + alen;//alert(j);if (document.cookie.substring(i, j) == arg) return getCookieVal(j);i = document.cookie.indexOf(" ", i) + 1;if (i == 0) break; } return null; } var isPostBack = "";function getCookieVal(offset) { var endstr = document.cookie.indexOf(";", offset); if (endstr == -1) endstr = document.cookie.length; return unescape(document.cookie.substring(offset, endstr)); } //写入到Cookiefunction SetCookie(name, value, expires) { var argv = SetCookie.arguments; //本例中length = 3 var argc = SetCookie.arguments.length; var expires = (argc > 2) ? argv[2] : null; var path = (argc > 3) ? argv[3] : null; var domain = (argc > 4) ? argv[4] : null; var secure = (argc > 5) ? argv[5] : false; document.cookie = name + "=" + escape(value) + ((expires == null) ? "" : ("; expires=" + expires.toGMTString())) + ((path == null) ? "" : ("; path=" + path)) + ((domain == null) ? "" : ("; domain=" + domain)) + ((secure == true) ? "; secure" : ""); }function ResetCookie() { var usr = document.getElementById( xtUserName).value; var expdate = new Date(); SetCookie(usr, null, expdate); }

用户名:密码： 记住密码

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