JS存取Cookie

// 保存 Cookie
function setCookie ( name, value )
{
expires = new Date();
expires.setTime(expires.getTime() + (1000 * 86400 * 365));
document.cookie = name + "=" + escape(value) + "; expires=" + expires.toGMTString() + "; path=/";
}

// 获取 Cookie
function getCookie ( name )
{
cookie_name = name + "=";
cookie_length = document.cookie.length;
cookie_begin = 0;
while (cookie_begin < cookie_length)
{
value_begin = cookie_begin + cookie_name.length;
if (document.cookie.substring(cookie_begin, value_begin) == cookie_name)
{
var value_end = document.cookie.indexOf ( ";", value_begin);
if (value_end == -1)
{
value_end = cookie_length;
}
return unescape(document.cookie.substring(value_begin, value_end));
}
cookie_begin = document.cookie.indexOf ( " ", cookie_begin) + 1;
if (cookie_begin == 0)
{
break;
}
}
return null;
}

// 清除 Cookie
function delCookie ( name )
{
var expireNow = new Date();
document.cookie = name + "=" + "; expires=Thu, 01-Jan-70 00:00:01 GMT" + "; path=/";
}