用js实现记住密码功能，但是前端记住密码不安全，最好还是不要用。我感觉这个记住密码应该是通过与后台建立一个会话来实现。
这个效果的测试地址在：http://ofoyou.com/blog/rePassword.html
<!DOCTYPE HTML> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>js COOKIE 记住帐号或密码</title> <script type="text/javascript"> //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; } 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=" + 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()"> <br> 密码： <input type="password" id="txtPassword"> <input type="checkbox" id="chkRememberPwd" />记住密码 <br> <input type="button" OnClick="SetPwdAndChk()" value="进入" /> </div> </form> </body> </html>