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使用javascript操作cookies的实例

<script>//写cookies函数 作者:翟振凯function SetCookie(name,value)//两个参数,一个是cookie的名子,一个是值{    var Days = 30; //此 cookie 将被保存 30 天    var exp  = new Date();    //new Date("December 31, 9998");    exp.setTime(exp.getTime() + Days*24*60*60*1000);    document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();}function getCookie(name)//取cookies函数        {    var arr = document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));     if(arr != null) return unescape(arr[2]); return null;}function delCookie(name)//删除cookie{    var exp = new Date();    exp.setTime(exp.getTime() - 1);    var cval=getCookie(name);    if(cval!=null) document.cookie= name + "="+cval+";expires="+exp.toGMTString();}SetCookie ("xiaoqi", "3")alert(getCookie(‘xiaoqi‘));</script> 
一个非常实用的javascript读写Cookie函数一个非常实用的javascript读写Cookie函数  function  GetCookieVal(offset)//获得Cookie解码后的值{var  endstr  =  documents.cookie.indexOf  (";",  offset);if  (endstr  ==  -1)endstr  =  documents.cookie.length;return  unescape(documents.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  ));documents.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);documents.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  =  documents.cookie.length;var  i  =  0;while  (i  <  clen){var  j  =  i  +  alen;if  (documents.cookie.substring(i,  j)  ==  arg)return  GetCookieVal  (j);i  =  documents.cookie.indexOf("  ",  i)  +  1;if  (i  ==  0)  break;}return  null;} <SCRIPT  language="javascript"><!--function  openpopup(){url="popup.htm"window.open("gonggao.htm","gonggao","width=260,height=212,left=200,top=0")}function  get_cookie(Name)  {var  search  =  Name  +  "="var  returnvaluehttp://www.mamicode.com/ =  "";if  (documents.cookie.length  >  0)  {offset  =  documents.cookie.indexOf(search)if  (offset  !=  -1)  {offset  +=  search.lengthend  =  documents.cookie.indexOf(";",  offset);if  (end  ==  -1)end  =  documents.cookie.length;returnvalue=unescape(documents.cookie.substring(offset,  end))}}return  returnvalue;}function  helpor_net(){if  (get_cookie(‘popped‘)==‘‘){openpopup()documents.cookie="popped=yes"}}helpor_net()//--></SCRIPT> 如果点了确定,只要不清cookie,以后访问都不会再提示,如果不点确定则每次都会提示。放在js文件里,全站包含<SCRIPT LANGUAGE="JavaScript"><!--var the_cookie = document.cookie;var broken_cookie = the_cookie.split(":");var the_visiteraccepted = unescape(broken_cookie[1]);//if (the_visiteraccepted=="undefined"){        var tmp=confirm(‘中国人何时何地。‘);        if(tmp==false){                window.close();        }else{                var the_visiteraccepted = 1;                  var the_cookie = "ILoveChina=visiteraccepted:" + escape(the_visiteraccepted);                                         document.cookie = the_cookie;        }}//--></SCRIPT>

1. Cookie的兼容性问题 

  Cookie的格式有2个不同的版本,第一个版本,我们称为Cookie Version 0,是最初由Netscape公司制定的,也被几乎所有的浏览器支持。而较新的版本,Cookie Version 1,则是根据RFC 2109文档制定的。为了确保兼容性,JAVA规定,前面所提到的涉及Cookie的操作都是针对旧版本的Cookie进行的。而新版本的Cookie目前还不被Javax.servlet.http.Cookie包所支持。 

2. Cookie的内容 

  同样的Cookie的内容的字符限制针对不同的Cookie版本也有不同。在Cookie Version 0中,某些特殊的字符,例如:空格,方括号,圆括号,等于号(=),逗号,双引号,斜杠,问号,@符号,冒号,分号都不能作为Cookie的内容。这也就是为什么我们在例子中设定Cookie的内容为"Test_Content"的原因。 

  虽然在Cookie Version 1规定中放宽了限制,可以使用这些字符,但是考虑到新版本的Cookie规范目前仍然没有为所有的浏览器所支持,因而为保险起见,我们应该在Cookie的内容中尽量避免使用这些字符。