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>