<!--
//学习一下如何利用js来操作cookie
//写入 cookie
//不区分 cookieName 的大小写
//不考虑子键
function WriteCookies(cookieName, cookieValue, expires)
{
if (expires)
{
//指定了 expires
document.cookie =
WriteCookies_GetCookieName(cookieName) + "=" + escape(cookieValue)
+ "; expires=" + xpires.toGMTString();
}
else
{
document.cookie = WriteCookies_GetCookieName(cookieName) + "=" + escape(cookieValue);
}
}
//获取并返回与 cookieName 同名的 cookie 名称，允许大小写不同
//如果不存在这样的 cookie，就返回 cookieName
function WriteCookies_GetCookieName(cookieName)
{
var lowerCookieName = cookieName.toLowerCase();
var cookieStr = document.cookie;
if (cookieStr == "")
{
return cookieName;
}
var cookieArr = cookieStr.split("; ");
var pos = -1;
for (var i=0; i<cookieArr.length; i++)
{
pos = cookieArr[i].indexOf("=");
if (pos > 0)
{
if (cookieArr[i].substring(0, pos).toLowerCase() == lowerCookieName)
{
return cookieArr[i].substring(0, pos);
}
}
}
return cookieName;
}
//获取并返回 cookie 值
//不区分 cookieName 的大小写
//dfltValue 为默认返回值
//不考虑子键
function ReadCookies(cookieName, dfltValue)
{
var lowerCookieName = cookieName.toLowerCase();
var cookieStr = document.cookie;
if (cookieStr == "")
{
return dfltValue;
}
var cookieArr = cookieStr.split("; ");
var pos = -1;
for (var i=0; i<cookieArr.length; i++)
{
pos = cookieArr[i].indexOf("=");
if (pos > 0)
{
if (cookieArr[i].substring(0, pos).toLowerCase() == lowerCookieName)
{
return unescape(cookieArr[i].substring(pos+1, cookieArr[i].length));
}
}
}
return dfltValue;
}
//test all the oper
document.write("写入名称为 cv 的 cookie...<br>");
WriteCookies("test", "test123", null);
document.write("写入名称为 Ab，带失效日期的 cookie...<br>");
var expires = new Date("December 11, 2010");
WriteCookies("singleblue", "test234", expires);
document.write("读取名称为 singleblue 的 cookie..." + ReadCookies("ab", ""));
-->