javascript记住用户名和登录密码

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。

<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=" + 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>