下面主要通過(guò)代碼給大家展示下javascript記住用戶(hù)名和登錄密碼，具體代碼內(nèi)容請(qǐng)看下文。
第一種方式：
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;">記住密碼</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">點(diǎn)擊返回登陸框</a></body></html>cookie.js//新建cookie。//hours為空字符串時(shí),cookie的生存期至瀏覽器會(huì)話結(jié)束。hours為數(shù)字0時(shí),建立的是一個(gè)失效的cookie,這個(gè)cookie會(huì)覆蓋已經(jīng)建立過(guò)的同名、同path的cookie（如果這個(gè)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;}//獲取cookie值function getCookieValue(name){ var name = escape(name); //讀cookie屬性，這將返回文檔的所有cookie var allcookies = document.cookie; //查找名為name的cookie的開(kāi)始位置 name += "="; var pos = allcookies.indexOf(name); //如果找到了具有該名字的cookie，那么提取并使用它的值 if (pos != -1){ //如果pos值為-1則說(shuō)明搜索"version="失敗 var start = pos + name.length; //cookie值開(kāi)始的位置 var end = allcookies.indexOf(";",start); //從cookie值開(kāi)始的位置起搜索第一個(gè)";"的位置,即cookie值結(jié)尾的位置 if (end == -1) end = allcookies.length; //如果end值為-1說(shuō)明cookie列表里只有一個(gè)cookie var value = allcookies.substring(start,end); //提取cookie的值 return (value); //對(duì)它解碼 } else return ""; //搜索失敗，返回空字符串}//刪除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，顯示上次的登陸信息 var userNameValue = getCookieValue("userName"); $("userName").value = userNameValue; var passwordValue = getCookieValue("password"); $("password").value = passwordValue; //寫(xiě)入點(diǎn)擊事件 $("submit").onclick = function() { var userNameValue = $("userName").value; var passwordValue = $("password").value; //服務(wù)器驗(yàn)證（模擬） 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("登陸成功,歡迎你," + userNameValue + "!"); self.location.replace("welcome.html"); } else alert("用戶(hù)名或密碼錯(cuò)誤，請(qǐng)重新輸入！"); }}第二種方式：
<script type="text/javascript">window.onload=function onLoginLoaded() {if(isPostBack == "False") {GetLastUser();}}function GetLastUser() {var id = "49BAC005-7D5B-4231-8CEA-16939BEACD67";//GUID標(biāo)識(shí)符var usr = GetCookie(id);if (usr != null) {document.getElementById('txtUserName').value = usr;} else {document.getElementById('txtUserName').value = "001";}GetPwdAndChk();}//點(diǎn)擊登錄時(shí)觸發(fā)客戶(hù)端事件function SetPwdAndChk() {//取用戶(hù)名var usr = document.getElementById('txtUserName').value;alert(usr);//將最后一個(gè)用戶(hù)信息寫(xiě)入到CookieSetLastUser(usr);//如果記住密碼選項(xiàng)被選中if(document.getElementById('chkRememberPwd').checked == true) {//取密碼值var pwd = document.getElementById('txtPassword').value;alert(pwd);var expdate = new Date();expdate.setTime(expdate.getTime() + 14 * (24 * 60 * 60 * 1000));//將用戶(hù)名和密碼寫(xiě)入到CookieSetCookie(usr, pwd, expdate);} else {//如果沒(méi)有選中記住密碼,則立即過(guò)期ResetCookie();}}function SetLastUser(usr) {var id = "49BAC005-7D5B-4231-8CEA-16939BEACD67";var expdate = new Date();//當(dāng)前時(shí)間加上兩周的時(shí)間expdate.setTime(expdate.getTime() + 14 * (24 * 60 * 60 * 1000));SetCookie(id, usr, expdate);}//用戶(hù)名失去焦點(diǎn)時(shí)調(diào)用該方法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));}//寫(xiě)入到Cookiefunction SetCookie(name, value, expires) {var argv = SetCookie.arguments;//本例中l(wèi)ength = 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> 用戶(hù)名:<input type="text" ID="txtUserName" onblur="GetPwdAndChk()"><input type="password" ID="txtPassword">密碼：<input type="checkbox" ID="chkRememberPwd" />記住密碼<input type="button" OnClick="SetPwdAndChk()" value="進(jìn)入"/></div></form></body>以上就是用兩種方式展示javascript記住用戶(hù)名和登錄密碼的全部代碼，沒(méi)有來(lái)得及整理運(yùn)行效果圖，希望大家能夠喜歡。
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