JS操作Cookie，对Cookie的增、删、查
html页面：
<html>
<head>
<title></title>
<script type="text/javascript">
//增加Cookie
function SaveCookie()
{
var cname=document.forms[0].txtcookiename.value;
var cvalue = document.forms[0].txtcookievalue.value;
var ctime=document.forms[0].txtcookietime.value;
var ms = parseInt(ctime)*24*60*60*1000;
var today= new Date();
var date = new Date();
date.setTime(today.getTime()+ms);
var dates = date.toGMTString();
document.cookie=cname+"="+cvalue+";expices="+ date.toGMTString();
alert("保存Cookie成功！");
}
//读取Cookie
function ReadCookie()
{
var name = document.forms[0].readname.value;
var search = name+"=";
begin = document.cookie.indexOf(search);
if(begin!=-1)
{
//设置Cookie值的开始位置
begin += search.length;
//设置Cookie值得结束位置
end = document.cookie.indexOf(";",begin);
if(end == -1)
{
end = document.cookie.length;
}
alert("Cookie"+name+"的值为："+document.cookie.substring(begin,end));
}else
{
alert("Cookie"+name+"不存在！");
}
}
//删除Cookie
function DeleteCookie()
{
var cookiename=document.forms[0].deletename.value;
document.cookie=cookiename+"=;expries="+new Date().toGMTString();
alert("名称为:"+cookiename+"的Cookie已删除！");
}
</script>
</head>
<body>
<form id="form1" name="form1" method="post" action="">
<p>Cookie名字：<input type="text" name="txtcookiename"/></br>
值：<input type="text" name="txtcookievalue" /></br>
有效期:<input type="text" name="txtcookietime" /><br>
<input type="button" value="保存Cookie" name="savecookie" onclick="SaveCookie()"/>
</p>
<p>
要读取Cookie的名字：<input type="text" name="readname" />
<input type="button" value="读取" onclick="ReadCookie()"/>
</p>
<p>
要删除Cookie的名字：<input type="text" name="deletename" />
<input type="button" value="删除" onclick="DeleteCookie()"/>
</p>
</form>
</body>
</html>
