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>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; _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cookie function deleteCookie(name,path){ var name = escape(name); var expires = new Date(0); 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('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Cookie SetCookie(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Cookie function 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)) + ((domain == null) "; domain=" + domain)) + ((secure == true) "); } 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" 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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