js 记住 用户名和密码实现也是看的一篇文章。纯js当然我们可以混着jquery使用

html

<!--网站登录跳转 -->
<form name="jumpFrm" id="jumpFrm" action="" method="POST" target="_blank">
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td width="69" height="26" align="right">用户名：</td>
<td><input type="text" name="userName" id="userName" class="text_input2" style="width:126px; height:15px;"/></td>
</tr>
<tr>
<td height="26" align="right">密码：</td>
<input type="hidden" name="domainAccount" value="whir">
<td><input type="password" name="userPassword" id="userPassword" class="text_input2" style="width:50px; height:15px;"/>

记住密码：
<input type="checkbox" name="rmbPassword" id="rmbPassword"/>
</td>
</tr>
<tr>
<td height="26" align="right">选择系统：</td>
<td>

<select name="jmpLocation" style="width:126px; height:20px;">
<option value="1" selected="selected">综合办公平台</option>
<option value="2">内网门户后台</option>
<option value="3">邮件系统</option>
</select>

</td>
</tr>
<tr>
<td height="28" align="right" valign="bottom></td>
<td valign="bottom">
&nbsp;
<input type="button" name="Submit22" value="登 录" class="btn_2" onclick="jmpLogin();"/>
&nbsp;
<input type="reset" name="Submit2" value="重 置" class="btn_2"/>
</td>
</tr>
</table>

<input type="hidden" name="Password" id="password" value=""/>
<input type="hidden" name="LoginName" id="LoginName" />

</form>

js

<!--网站登录跳转 -->
<mce:script type="text/javascript"><!--
function jmpLogin(){
//跳转
document.jumpFrm.action="";
var userName=document.getElementById("userName").value;
var userPassword=document.getElementById("userPassword").value;
if(userName==""){
alert("用户名不能为空,请填写！");
return;
}else if(userPassword==""){
alert("密码不能为空,请输入！");
return;
}

var jmpLocation=document.getElementById("jmpLocation").value;
//document.all.memberid.checked==true
if(document.all.rmbPassword.checked){
//alert("begin to rmb password!!!");
setCookie("userName",userName,24,"/");
setCookie("userPassword",userPassword,24,"/");
//alert("OK!COOKIE");
}

if(jmpLocation==1){
document.jumpFrm.action="http://10.41.7.41:7001/defaultroot/LogonAction.do";
jumpFrm.submit();
}
if(jmpLocation==2){
document.jumpFrm.action="http://10.41.7.40:8123/defaultroot/LogonAction.do";
jumpFrm.submit();
}
if(jmpLocation==3){
// http://mail.hnsl.gov.cn/remote.php?LoginName=PMAIL_USER&Password=PMAIL_PASS
document.getElementById("LoginName").value=document.getElementById("userName").value;
document.getElementById("password").value=document.getElementById("userPassword").value;
document.jumpFrm.action="http://mail.hnsl.gov.cn/remote.php";
jumpFrm.submit();

}
}

//获取cookie信息
function getRememberInfo(){
// alert("---获取cookie信息---");

try{
var userName="";
var userPassword="";
userName=getCookieValue("userName");
userPassword=getCookieValue("userPassword");
document.getElementById("userName").value=userName;
document.getElementById("userPassword").value=userPassword;
}catch(err){
alert("NO RMB PASSWORD!");
}
}

//新建cookie。
//hours为空字符串时,cookie的生存期至浏览器会话结束。hours为数字0时,建立的是一个失效的cookie,这个cookie会覆盖已经建立过的同名、同path的cookie（如果这个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;
}
//获取cookie值
function getCookieValue(name){
var name = escape(name);
//读cookie属性，这将返回文档的所有cookie
var allcookies = document.cookie;
//查找名为name的cookie的开始位置
name += "=";
var pos = allcookies.indexOf(name);
//如果找到了具有该名字的cookie，那么提取并使用它的值
if (pos != -1){ //如果pos值为-1则说明搜索"version="失败
var start = pos + name.length; //cookie值开始的位置
var end = allcookies.indexOf(";",start); //从cookie值开始的位置起搜索第一个";"的位置,即cookie值结尾的位置
if (end == -1) end = allcookies.length; //如果end值为-1说明cookie列表里只有一个cookie
var value = allcookies.substring(start,end); //提取cookie的值
return unescape(value); //对它解码
}
else return ""; //搜索失败，返回空字符串
}
//删除cookie
function deleteCookie(name,path){
var name = escape(name);
var expires = new Date(0);
path = path == "" ? "" : ";path=" + path;
document.cookie = name + "="+ ";expires=" + expires.toUTCString() + path;
}

// --></mce:script>

看完应该基本了解了cookie的使用，其实就是document.cookie进行存入，删除时候其实就是赋值为“”，我们可以结合上面的方法自己写一个js文件每次导入引用就好

我贴上我写的js，用到哪写到哪就好,如下：

/**
*Cookie plugin
*Copyrighte (c) 2015 Dylan Zhang
*Created on 24th April 2015
*/

var Dcookie = {
    setCookie: function (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;
    },
    getCookie: function (name) {
        var name = escape(name);
        var allCookies = document.cookie;
        name += "=";
        var pos = allCookies.indexOf(name);
        if (pos != -1) {
            var start = pos + name.length;
            var end = allCookies.indexOf(";", start);
            if (end == -1) end = allCookies.length;
            var value = allCookies.substring(start, end);
            return unescape(value);
        }
        else return "";
    },
    delCookie: function (name, path) {
        var name = escape(name);
        var expires = new Date(0);
        path = path == "" ? "" : ";path=" + path;
        document.cookie = name + "=" + ";expires=" + expires.toUTCString() + path;
    }
}