javascript操作cookie

<转>javascript操作cookie

关键字: javascript
http://script.xhtmlhelp.net/VBscript/200610/10485.shtml
javascript操作cookie

/**

* Read the JavaScript cookies tutorial at:

* http://www.netspade.com/articles/javascript/cookies.xml

*/

/**

* Sets a Cookie with the given name and value.

*

* name Name of the cookie

* value Value of the cookie

* [expires] Expiration date of the cookie (default: end of current session)

* [path] Path where the cookie is valid (default: path of calling document)

* [domain] Domain where the cookie is valid

* (default: domain of calling document)

* [secure] Boolean value indicating if the cookie transmission requires a

* secure transmission

*/

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" : "");

}

/**

* Gets the value of the specified cookie.

*

* name Name of the desired cookie.

*

* Returns a string containing value of specified cookie,

* or null if cookie does not exist.

*/

function getCookie(name)

{

var dc = document.cookie;

var prefix = name + "=";

var begin = dc.indexOf("; " + prefix);

if (begin == -1)

{

begin = dc.indexOf(prefix);

if (begin != 0) return null;

}

else

{

begin += 2;

}

var end = document.cookie.indexOf(";", begin);

if (end == -1)

{

end = dc.length;

}

return unescape(dc.substring(begin + prefix.length, end));

}

/**

* Deletes the specified cookie.

*

* name name of the cookie

* [path] path of the cookie (must be same as path used to create cookie)

* [domain] domain of the cookie (must be same as domain used to create 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";

}

}

function setCookies(name,value)

{

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 getCookies(name)

{

var arr = document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));

if(arr != null) return unescape(arr[2]); return null;

}

function delCookies(name)

{

var exp = new Date();

exp.setTime(exp.getTime() - 1);

var cval=getCookie(name);

if(cval!=null) document.cookie=name +"="+cval+";expires="+exp.toGMTString();

}

function getCookie(name)

{

var dc = document.cookie;

var prefix = name + "=";

var begin = dc.indexOf("; " + prefix);

if (begin == -1)

{

begin = dc.indexOf(prefix);

if (begin != 0) return null;

}

else

{

begin += 2;

}

var end = document.cookie.indexOf(";", begin);

if (end == -1)

{

end = dc.length;

}

return unescape(dc.substring(begin + prefix.length, end));

}

这个应该不行吧.
=======================================

//另一个读取COOKIE的方法

function GetCookieData(sL)

{

var sRet="";

var sC=""+document.cookie;

if(sC.length>0)

{

var aC=sC.split(";",100);

var iC=aC.length;

for(var i=0;i<iC;i++)

{

if(aC[i].indexOf(sL+"=")!=-1)

{

var aRet=aC[i].split("=");

sRet=unescape(aRet[1]);

break;

}

}

}

return sRet;

}

------------------------------------------------------------------

注释：

------------------------------------------------------------------

document.cookie = 读取存取在你本地的cookie信息

JavaScript中indexOf函数

JavaScript中indexOf函数方法是返回 String 对象内第一次出现子字符串的字符位置。使用方法：

strObj.indexOf(subString[, startIndex])

其中strObj是必选项。String 对象或文字。

subString是必选项。要在 String 对象中查找的子字符串。

starIndex是可选项。该整数值指出在 String 对象内开始查找的索引。

如果省略，则从字符串的开始处查找。

对于JavaScript的indexOf忽略大小写，

JavaScript中indexOf函数方法返回一个整数值，

指出 String 对象内子字符串的开始位置。如果没有找到子字符串，则返回 -1。

如果 startindex 是负数，则 startindex 被当作零。如果它比最大的字符位置索引还大，则它被当作最大的可能索引。

indexOf函数是从左向右执行查找。否则，该方法与 lastIndexOf 相同。

下面的示例说明了indexOf函数方法的用法。

function IndexDemo(str2){

var str1 = "BABEBIBOBUBABEBIBOBU"

var s = str1.indexOf(str2);

return(s);

}