Cookie - SKILL.NULL

function setCookie(cookieName, cookieValue, expires) { // 设置Cookie

function getCookieName(cookieName) { //获取并返回与 cookieName 同名的 cookie 名称，允许大小写不同,如果不存在这样的 cookie，就返回 cookieName

var lowerCookieName = cookieName.toLowerCase(); //转换为小写

var cookieStr = document.cookie; // 获取当前cookie

if (cookieStr == "") {

return cookieName;

}

var cookieArr = cookieStr.split(";");

var pos = -1;

for (var i = 0; i < cookieStr.length; i++) {

pos = cookieArr[i].indexOf("=");

if (pos > 0) {

if (cookieArr[i].substring(0, pos).toLowerCase() == lowerCookieName) {

return cookieArr[i].substring(0, pos);

}

return cookieName;

}

function writeCookie(cookieName, cookieValue, expires) { // 写cookie,不区分大小写

if (expires) {

document.cookie = getCookieName(cookieName) + "=" + escape(cookieValue) + "; expires=" + expires.toGMTString();

} else {

document.cookie = getCookieName(cookieName) + "=" + escape(cookieValue);

}

function readCookie(cookieName, defaultValue) { //获取并返回 cookie 值,不区分大小写

var lowerCookieName = cookieName.toLowerCase();

var cookieStr = document.cookie;

if (cookieStr == "") {

return defaultValue;

}

var cookieArr = cookieStr.split("; ");

var pos = -1;

for (var i = 0; i < cookieArr.length; i++) {

pos = cookieArr[i].indexOf("=");

if (pos > 0) {

if (cookieArr[i].substring(0, pos).toLowerCase() == lowerCookieName) {

return unescape(cookieArr[i].substring(pos + 1, cookieArr[i].length));

}

return defaultValue;

}

writeCookie(cookieName, cookieValue, expires);

}