javascript与cookie的问题详解_javascript技巧

$.Cookie = {};
(function ($) {
$.getExpires = function (y, m, d, h, i, s, ms) {
var date = new Date();
y = isNaN(y) ? date.getFullYear() : y;
m = isNaN(m) ? date.getMonth() : m - 1;
d = isNaN(d) ? date.getDate() : d;
h = isNaN(h) ? date.getHours() : h;
i = isNaN(i) ? date.getMinutes() : i;
s = isNaN(s) ? date.getSeconds() : s;
ms = isNaN(ms) ? date.getMilliseconds() : ms;
return new Date(y, m, d, h, i, s, ms).toUTCString();
}
$.getExpiresByUTCString = function (UTCString) {
var s = new Date(UTCString).toUTCString();
if (s == NaN || s == Invalid Date)
return null; // IE,Opera NaN , FF,Safari Invalid Date;
else
return s;
}

$.set = function (k, v, expires, path, domain, secure) {
var cookie = k + = + encodeURIComponent(v);
if (expires) cookie += ";expires=" + expires;
if (path) cookie += ";path=" + path;
if (domain) cookie += ";domain=" + domain;
if (secure) cookie += ";secure";
document.cookie = cookie;
}

/*
以前是把所有 cookie 都取出放到一个对象里，在 get 的时候，直接从那个对象里取来，现在想想，那样并不正确。因为假如某个 cookie 的过期时间过了，那个对象并没有更新。
*/
$.get = function (k) {
var cks = document.cookie.split(;);
var t;
for (var i = 0; i < cks.length; i++) {
t = cks[i].split(=);
if (k == t[0].trim()) return t.length >= 2 ? decodeURIComponent(t[1]) : "";
}
return null;
}
$.remove = function (k, path, domain) {
$.set(k, , $.getExpires(new Date().getFullYear() - 1), path, domain);
}
$.empty = function (path, domain) {
var cks = document.cookie.split(;);
var t;
for (var i = 0; i < cks.length; i++) {
$.remove(cks[i].split(=)[0].trim(), path, domain);
}
}
})($.Cookie);