话我就不多说了，大家都能看懂，写的有点乱，帮别人写的，贴下来，以后忘了再用
代码实现功能:
1.点击登录保存cookie
2.刷新或重新打开页面读出cookie
3.点击delete 删除当前username下的cookie
没有完成的问题:
大家看到在setCookie方法里能设置许多东西，如过期时间，作用域，保存路径等,但由于对这几个参数改如何设置不太清楚，比如作用域就是页面的根域名,路径该保存成什么格式的，如果有谁知道，请告诉我哈，谢谢了
<!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>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<script type="text/javascript">
function GetCookieVal(offset)
//获得Cookie解码后的值
{
var endstr = document.cookie.indexOf (";", offset);
if (endstr == -1)
endstr = document.cookie.length;
return unescape(document.cookie.substring(offset, endstr));
}
function SetCookie(name, value)
//设定Cookie值
{
var expdate = new Date();
var argv = SetCookie.arguments;
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;
if(expires!=null) expdate.setTime(expdate.getTime() + ( expires * 1000 ));
document.cookie = name + "=" + escape (value) +((expires == null) ? "" : ("; expires="+ expdate.toGMTString()))
+((path == null) ? "" : ("; path=" + path)) +((domain == null) ? "" : ("; domain=" + domain))
+((secure == true) ? "; secure" : "");
}
function DelCookie(name)
//删除Cookie
{
var exp = new Date();
exp.setTime (exp.getTime() - 1);
var cval = GetCookie (name);
document.cookie = name + "=" + cval + "; expires="+ exp.toGMTString();
}
function GetCookie(name)
//获得Cookie的原始值
{
var arg = name + "=";
var alen = arg.length;
var clen = document.cookie.length;
var i = 0;
while (i < clen)
{
var j = i + alen;
if (document.cookie.substring(i, j) == arg)
return GetCookieVal (j);
i = document.cookie.indexOf(" ", i) + 1;
if (i == 0) break;
}
return null;
}
function get$(obj)
{
return document.getElementById(obj);
}
</script>
</head>
<body onload="javascript:get$('username').value=GetCookie('Page')==null?'':GetCookie('Page');get$('password').value=GetCookie(GetCookie('Page'))==null?'':GetCookie(GetCookie('Page'));">
<table width="580" border="0" align="center">
<tr>
<td width="114"> </td>
<td width="456"> </td>
</tr>
<tr>
<td>用户名:</td>
<td><input type="text" name="username" id="username"/></td>
</tr>
<tr>
<td>密码</td>
<td><input type="text" name="password" id="password" /></td>
</tr>
<tr>
<td><input type="button" name="Submit" value="登陆" onclick="SetCookie('Page',get$('username').value);SetCookie(get$('username').value,get$('password').value);"/></td>
<td><input type="button" value="delete" onclick="DelCookie(GetCookie('Page'));DelCookie('Page');get$('username').value='';get$('password').value='';"/></td>
</tr>
</table>
</body>
</html>
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