精华区 [关闭][返回]

当前位置:网易精华区>>讨论区精华>>编程开发>>● ASP>>VBScript & JavaScript>>几个很好用的 Cookie 函数!!!

主题:几个很好用的 Cookie 函数!!!
发信人: yahao()
整理人: i_am_trueman(2003-10-22 16:31:05), 站内信件
一直在为操作客户端的COOKIE发愁,前几日在网上看到了一个这方面的
代码,觉得很不错,就收录起来了。现在推荐给各位,里面有详细的英
文说明(哪位大侠顺便给翻译一下就更好了)。
代码全文如下:
---------------------------
<script language="javascript">
<!-- begin script
//
// Cookie Functions -- "Night of the Living Cookie" Version
(25-Jul-96)
//
// Written by: Bill Dortch, hIdaho Design <[email protected]>
//  The following functions are released to the public domain.
//
//  This version takes a more aggressive approach to deleting
//  cookies.  Previous versions set the expiration date to one
//  millisecond prior to the current time; however, this method
//  did not work in Netscape 2.02 (though it does in earlier and
//  later versions), resulting in "zombie" cookies that would not
//  die.  DeleteCookie now sets the expiration date to the earliest
//  usable date (one second into 1970), and sets the cookie's value
//  to null for good measure.
//
//  Also, this version adds optional path and domain parameters to
//  the DeleteCookie function.  If you specify a path and/or domain
//  when creating (setting) a cookie**, you must specify the same
//  path/domain when deleting it, or deletion will not occur.
//
//  The FixCookieDate function must now be called explicitly to
//  correct for the 2.x Mac date bug.  This function should be
//  called *once* after a Date object is created and before it
//  is passed (as an expiration date) to SetCookie.  Because the
//  Mac date bug affects all dates, not just those passed to
//  SetCookie, you might want to make it a habit to call
//  FixCookieDate any time you create a new Date object:
//
//    var theDate = new Date();
//    FixCookieDate (theDate);
//
//  Calling FixCookieDate has no effect on platforms other than
//  the Mac, so there is no need to determine the user's platform
//  prior to calling it.
//
//  This version also incorporates several minor coding improvements.
//
//  **Note that it is possible to set multiple cookies with the same
//  name but different (nested) paths.  For example:
//
//    SetCookie ("color","red",null,"/outer");
//    SetCookie ("color","blue",null,"/outer/inner");
//
//  However, GetCookie cannot distinguish between these and will 
return
//  the first cookie that matches a given name.  It is therefore
//  recommended that you *not* use the same name for cookies with
//  different paths.  (Bear in mind that there is *always* a path
//  associated with a cookie; if you don't explicitly specify one,
//  the path of the setting document is used.)
//  
//  Revision History:
//
//    "Toss Your Cookies" Version (22-Mar-96)
//      - Added FixCookieDate() function to correct for Mac date bug
//
//    "Second Helping" Version (21-Jan-96)
//      - Added path, domain and secure parameters to SetCookie
//      - Replaced home-rolled encode/decode functions with Netscape's
//        new (then) escape and unescape functions
//
//    "Free Cookies" Version (December 95)
//
//
//  For information on the significance of cookie parameters, and
//  and on cookies in general, please refer to the official cookie
//  spec, at:
//
//      http://www.netscape.com/newsref/std/cookie_spec.html    
//
//******************************************************************
//
// "Internal" function to return the decoded value of a cookie
//
function getCookieVal (offset) {
  var endstr = document.cookie.indexOf (";", offset);
  if (endstr == -1)
    endstr = document.cookie.length;
  return unescape(document.cookie.substring(offset, endstr));
}
//
//  Function to correct for 2.x Mac date bug.  Call this function to
//  fix a date object prior to passing it to SetCookie.
//  IMPORTANT:  This function should only be called *once* for
//  any given date object!  See example at the end of this document.
//
function FixCookieDate (date) {
  var base = new Date(0);
  var skew = base.getTime(); // dawn of (Unix) time - should be 0
  if (skew > 0)  // Except on the Mac - ahead of its time
    date.setTime (date.getTime() - skew);
}
//
//  Function to return the value of the cookie specified by "name".
//    name - String object containing the cookie name.
//    returns - String object containing the cookie value, or null if
//      the cookie does not exist.
//
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;
if (document.cookie.substring(i, j) == arg)
return getCookieVal (j);
i = document.cookie.indexOf(" ", i) + 1;
if (i == 0) break;
}
return null;
}
//
// Function to create or update a cookie.
// name - String object containing the cookie name.
// value - String object containing the cookie value. May contain
// any valid string characters.
// [expires] - Date object containing the expiration data of the
cookie. If
// omitted or null, expires the cookie at the end of the current
session.
// [path] - String object indicating the path for which the cookie is
valid.
// If omitted or null, uses the path of the calling document.
// [domain] - String object indicating the domain for which the
cookie is
// valid. If omitted or null, uses the domain of the calling
document.
// [secure] - Boolean (true/false) value indicating whether cookie
transmission
// requires a secure channel (HTTPS).
//
// The first two parameters are required. The others, if supplied,
must
// be passed in the order listed above. To omit an unused optional
field,
// use null as a place holder. For example, to call SetCookie using
name,
// value and path, you would code:
//
// SetCookie ("myCookieName", "myCookieValue", null, "/");
//
// Note that trailing omitted parameters do not require a placeholder.

//
// To set a secure cookie for path "/myPath", that expires after the
// current session, you might code:
//
// SetCookie (myCookieVar, cookieValueVar, null, "/myPath", null,
true);
//
function SetCookie (name,value,expires,path,domain,secure) {
document.cookie = name + "=" + escape (value) +
((expires) ? "; expires=" + expires.toGMTString() : "") +
((path) ? "; path=" + path : "") +
((domain) ? "; domain=" + domain : "") +
((secure) ? "; secure" : "");
}

// Function to delete a cookie. (Sets expiration date to start of
epoch)
// name - String object containing the cookie name
// path - String object containing the path of the cookie to
delete. This MUST
// be the same as the path used to create the cookie, or
null/omitted if
// no path was specified when creating the cookie.
// domain - String object containing the domain of the cookie to
delete. This MUST
// be the same as the domain used to create the cookie, or
null/omitted if
// no domain was specified when creating the cookie.
//
function DeleteCookie (name,path,domain) {
if (GetCookie(name)) {
document.cookie = name + "=" +
((path) ? "; path=" + path : "") +
((domain) ? "; domain=" + domain : "") +
"; expires=Thu, 01-Jan-70 00:00:01 GMT";
}
}

//
// Examples
//
var expdate = new Date ();
FixCookieDate (expdate); // Correct for Mac date bug - call only once
for given Date object!
expdate.setTime (expdate.getTime() + (24 * 60 * 60 * 1000)); // 24 hrs
from now
SetCookie ("ccpath", "http://www.hidaho.com/colorcenter/", expdate);
SetCookie ("ccname", "hIdaho Design ColorCenter", expdate);
SetCookie ("tempvar", "This is a temporary cookie.");
SetCookie ("ubiquitous", "This cookie will work anywhere in this
domain",null,"/");
SetCookie ("paranoid", "This cookie requires secure communications",
expdate,"/",null,true);
SetCookie ("goner", "This cookie must die!");
document.write (document.cookie + "<br>");
DeleteCookie ("goner");
document.write (document.cookie + "<br>");
document.write ("ccpath = " + GetCookie("ccpath") + "<br>");
document.write ("ccname = " + GetCookie("ccname") + "<br>");
document.write ("tempvar = " + GetCookie("tempvar") + "<br>");
// end script -->
</script>
---------------------------
在使用前最好先仔细看一遍这些函数和说明。
--
http://yhpost.yeah.net
mail:[email protected]
--
你好,我好,大家好。

※ 来源:.网易 BBS bbs.netease.com.[FROM: 202.109.192.6]

[关闭][返回]