电脑技术学习

javascript读写Cookie函数实例

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function GetCookieVal(offset)

//获得Cookie解码后的值

{

var endstr = document.cookie.indexOf (";", offset);

if (endstr == -1)

endstr = document.cookie.length;

return unescape(document.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 ));

document.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);

document.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 = 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;

}