下面主要通过代码给大家展示下javascript记住用户名和登录密码，具体代码内容请看下文。
第一种方式：
CONTENT
login.html
welcome.html
cookie.js
common.js
login.html
<!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><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><title>login</title><script type="text/javascript" src="cookie.js"></script><script type="text/javascript" src="common.js"></script></head><body><form action=""><p> <span>UserName:</span> <input id="userName" type="text" value=""/></p><p> <span>Password:</span> <input id="password" type="password" value=""/></p><p> <span style="font-size:12px; color:blue;">记住密码</span> <input id="saveCookie" type="checkbox" value="" /></p><p> <input id="submit" type="button" value="GO" /></p></form></body></html>
welcome.html
<!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><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><title>welcome</title></head><body><h1>Welcome!</h1><a href="login.html">点击返回登陆框</a></body></html>cookie.js//新建cookie。//hours为空字符串时,cookie的生存期至浏览器会话结束。hours为数字0时,建立的是一个失效的cookie,这个cookie会覆盖已经建立过的同名、同path的cookie（如果这个cookie存在）。function setCookie(name,value,hours,path){ var name = escape(name); var value = escape(value); var expires = new Date(); expires.setTime(expires.getTime() + hours*3600000); path = path == "" ? "" : ";path=" + path; _expires = (typeof hours) == "string" ? "" : ";expires=" + expires.toUTCString(); document.cookie = name + "=" + value + _expires + path;}//获取cookie值function getCookieValue(name){ var name = escape(name); //读cookie属性，这将返回文档的所有cookie var allcookies = document.cookie; //查找名为name的cookie的开始位置 name += "="; var pos = allcookies.indexOf(name); //如果找到了具有该名字的cookie，那么提取并使用它的值 if (pos != -1){ //如果pos值为-1则说明搜索"version="失败 var start = pos + name.length; //cookie值开始的位置 var end = allcookies.indexOf(";",start); //从cookie值开始的位置起搜索第一个";"的位置,即cookie值结尾的位置 if (end == -1) end = allcookies.length; //如果end值为-1说明cookie列表里只有一个cookie var value = allcookies.substring(start,end); //提取cookie的值 return (value); //对它解码 } else return ""; //搜索失败，返回空字符串}//删除cookiefunction deleteCookie(name,path){ var name = escape(name); var expires = new Date(0); path = path == "" ? "" : ";path=" + path; document.cookie = name + "="+ ";expires=" + expires.toUTCString() + path;}common.js
function $(objStr){return document.getElementByIdx_x_x(objStr);}window.onload = function(){ //分析cookie值，显示上次的登陆信息 var userNameValue = getCookieValue("userName"); $("userName").value = userNameValue; var passwordValue = getCookieValue("password"); $("password").value = passwordValue; //写入点击事件 $("submit").onclick = function() { var userNameValue = $("userName").value; var passwordValue = $("password").value; //服务器验证（模拟） var isAdmin = userNameValue == "admin" && passwordValue =="123456"; var isUserA = userNameValue == "userA" && passwordValue =="userA"; var isMatched = isAdmin || isUserA; if(isMatched){ if( $("saveCookie").checked){ setCookie("userName",$("userName").value,24,"/"); setCookie("password",$("password").value,24,"/"); } alert("登陆成功,欢迎你," + userNameValue + "!"); self.location.replace("welcome.html"); } else alert("用户名或密码错误，请重新输入！"); }}第二种方式：
<script type="text/javascript">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('txtUserName').value = usr;} else {document.getElementById('txtUserName').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('txtUserName').value;alert(usr);//将最后一个用户信息写入到CookieSetLastUser(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('txtPassword').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('txtUserName').value;var pwd = GetCookie(usr);if (pwd != null) {document.getElementById('chkRememberPwd').checked = true;document.getElementById('txtPassword').value = pwd;} else {document.getElementById('chkRememberPwd').checked = false;document.getElementById('txtPassword').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 = "<%= 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 = 3var 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('txtUserName').value;var expdate = new Date();SetCookie(usr, null, expdate);}</script></head><body><form id="form1"><div> 用户名:<input type="text" ID="txtUserName" onblur="GetPwdAndChk()"><input type="password" ID="txtPassword">密码：<input type="checkbox" ID="chkRememberPwd" />记住密码<input type="button" OnClick="SetPwdAndChk()" value="进入"/></div></form></body>以上就是用两种方式展示javascript记住用户名和登录密码的全部代码，没有来得及整理运行效果图，希望大家能够喜欢。
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