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记住用户的登录名与密码实现自动登录或用户不需要再次输入密码功能其实是非常的简单了，下面来看js使用cookie记住用户名与密码的实例
js如何设置一个全站都能使用的cookie来记住用户名，记住访客的信息，方便访客下次的操作。js设置一个cookie网上有很多资料，但是只能在同目录下使用，其他地方就失效了。设置全局cookie只需加一个参数即可。
把 document.cookie=c_name+ "=" +escape(value)+
((expiredays==null) ? "" : ";expires="+exdate.toGMTString())
改成 document.cookie=c_name+ "=" +escape(value)+
(expiredays==null) ? "" : ";expires="+exdate.toGMTString())+"; path=/";
下面是完整范例：
<html>
<head>
<script type="text/javascript">
function getCookie(c_name)
{
if (document.cookie.length>0)
{
c_start=document.cookie.indexOf(c_name + "=")
if (c_start!=-1)
{
c_start=c_start + c_name.length+1
c_end=document.cookie.indexOf(";",c_start)
if (c_end==-1) c_end=document.cookie.length
return unescape(document.cookie.substring(c_start,c_end))
}
}
return ""
}
function setCookie(c_name,value,expiredays)
{
var exdate=new Date()
exdate.setDate(exdate.getDate()+expiredays)
document.cookie=c_name+ "=" +escape(value)+
((expiredays==null) ? "" : ";expires="+exdate.toGMTString())
}
function checkCookie()
{
username=getCookie('username')
if (username!=null && username!="")
{alert('Welcome again '+username+'!')}
else
{
username=prompt('Please enter your name:',"")
if (username!=null && username!="")
{
setCookie('username',username,365)
}
}
}
</script>
</head>
<body onLoad="checkCookie()">
</body>
</html>
注意：直接右键用浏览器打开是没有效果的，要放到站点下面才能起效。
再给各位补充一个例子
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>js COOKIE 记住帐号或密码</title>
<script language="javascript" type="text/javascript">
function onLoginLoaded()
{
if(isPostBack == "False")
{
GetLastUser();
}
}
function GetLastUser()
{
var id = "49BAC005-7D5B-4231-8CEA-16939BEACD67";
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>
</head>
<body onload="onLoginLoaded()">
<form id="form1">
<div>
用户名:<input type="text" ID="txtUserName" onblur="GetPwdAndChk()">
<input type="password" ID="txtPassword">
密码：<input type="checkbox" ID="chkRememberPwd" />记住密码
<input type="button" OnClick="SetPwdAndChk()" value="进入"/>
</div>
</form>
</body>
</html>
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