js cookie实现记住密码功能

<form id="form22" name="form22" action="checklogin.action" method="post" >
 <div class="username" style="margin-top:50px;">
  <label>用户名：</label>
  <input type="text" name="username" id="username" />
  <span id="myuser" style="color: red; font-size:12px; font-weight: normal;"></span>
 </div>

 <div class="password">
  <label>密 码：</label>
  <input name="password" id="password" type="password" />
  <span id="mypass" style="color: red; font-size:12px; font-weight: normal;"></span>
 </div>

 <div class="user_type" >
  <label>  </label>
  <input type="checkbox" id="saveusername" style="float: left; margin-top:3px;" /> 
  <span> 记住用户</span>  
 </div>

 <input type="button" value="" class="btn_login" id="btn_login" onclick="checkform();"/>

</form>

function setcookie (name, value) {
  var days = 30; //此 cookie 将被保存 30 天
  var exp = new date();
  exp.settime(exp.gettime() + 1000);
  if(value==""||value=="null"
   ||value=="null"||value==" "){
  }else{
  document.cookie = name + "="+ escape(value) +";expires=sun, 17-jan-2038 19:14:07 gmt";
  }
}
function getcookie(sname){
  var acookie = document.cookie.split("; ");
  for (var i=0; i < acookie.length; i++)
  {
   var acrumb = acookie[i].split("=");
   if (sname == acrumb[0])
   {
    return acrumb[1];
   }
  }
  return null;
}
function checkcookieexist(name){
 if (getcookie(name))
  return true;
 else
  return false;
}

function deletecookie(name, path, domain){
 var strcookie;
 // 检查cookie是否存在
 if (checkcookieexist(name)){
  // 设置cookie的期限为己过期
  strcookie = name + "=";
  strcookie += (path) ? "; path=" + path : "";
  strcookie += (domain) ? "; domain=" + domain : "";
  strcookie += "; expires=thu, 01-jan-70 00:00:01 gmt";
  document.cookie = strcookie;
 }
}
function savecookie(name, value, expires, path, domain, secure){
 var strcookie = name + "=" + value;
 if (expires){
  // 计算cookie的期限, 参数为天数
  var curtime = new date();
  curtime.settime(curtime.gettime() + expires*24*60*60*1000);
  strcookie += "; expires=" + curtime.togmtstring();
 }
 // cookie的路径
 strcookie += (path) ? "; path=" + path : "";
 // cookie的domain
 strcookie += (domain) ? "; domain=" + domain : "";
 // 是否需要保密传送,为一个布尔值
 strcookie += (secure) ? "; secure" : "";
 document.cookie = strcookie;
}

window.onload = function(){
 //console.log("ctx: " + "${ctx}");

 var name = getcookie("loginusername");
 document.getelementbyid("password").value="";
 if(name != null && name != "") {
  document.getelementbyid("username").value = name;      

  document.getelementbyid("password").focus();
 } else {  document.getelementbyid("username").focus();
 }

}

function checkform(){
 ......
 var ischecked = document.getelementbyid("saveusername").checked;
 if(ischecked) {
  setcookie("loginusername",username);
 } 
 ......
}

<form class="form-signin">
　　<input type="text" id="username" name="account" autofocus required placeholder="用户名" class="form-control" style="width: 250px; margin-bottom: 5px;">
　　<input type="password" id="password" name="password" required placeholder="密码" class="form-control" style="width: 250px;">
　　<br/>
　　<input id="remember_me" type="checkbox" name="remember_me" onkeydown="check_enter(event)" style="width:250;">
　　<span for="remember_me" onkeydown="check_enter(event)" style="width:250px">记住我</span>
　　<br/><br/>
　　<span class="btn btn-lg btn-primary btn-block">登 录</span>
</form>
<script src="jquery.js" type="text/javascript"></script>
　　<script src="jquery.cookie.js" type="text/javascript"></script>

if ($("#remember_me").attr("checked")) {
　　　　$.cookie("rmbuser", "true", { expires: 7 }); //存储一个带7天期限的cookie
　　　　$.cookie("username", account, { expires: 7 });
　　　　$.cookie("password", password, { expires: 7 });
}
else {
　　　　$.cookie("rmbuser", "false", { expire: -1 });
　　　　$.cookie("username", "", { expires: -1 });
　　　　$.cookie("password", "", { expires: -1 });
}

$().ready(function(){
　　　　//获取cookie的值
　　　　var username = $.cookie('username');
　　　　var password = $.cookie('password');

　　　　//将获取的值填充入输入框中
　　　　$('#username').val(username);
　　　　$('#password').val(password); 
　　　　if(username != null && username != '' && password != null && password != ''){
  //选中保存秘密的复选框
　　　　 $("#remember_me").attr('checked',true);
}