javascript中方便增删改cookie的一个类

/*
cookie helper class
easy to write,get,delete
*/
var myCookie={
get:function(name){
if(typeof name != "undefined")
{
//if name given call the get value function
return myCookie_get(name);
}else{
//if name is not given,i want get all the cookie item
return myCookie_getAll();
}
},
add:function(name,value,options){
//write the cookie
myCookie_add(name,value,options);
},
delete:function(name){
//delete the cookie
myCookie_add(name,null);
}
}
String.prototype.Trim = function()
{
return this.replace(/^\s+/g,"").replace(/\s+$/g,"");
}
/*
cookie write function
@name:the cookie name not null
@value:the cookie value null==delete the cookie
@option:{"expires":expire time;"path":/;"domain":localhost;"secure":secure}
*/
function myCookie_add(name,value,options)
{
if (typeof value != 'undefined') { // name and value given, set cookie
options = options || {};
if (value === null) {
value = '';
options.expires = -1;
}
var expires = '';
if (options.expires && (typeof options.expires == 'number' || options.expires.toUTCString)) {
var date;
if (typeof options.expires == 'number') {
date = new Date();
date.setTime(date.getTime() + (options.expires * 24 * 60 * 60 * 1000));
} else {
date = options.expires;
}
expires = '; expires=' + date.toUTCString(); // use expires attribute, max-age is not supported by IE
}
var path = options.path ? '; path=' + options.path : '';
var domain = options.domain ? '; domain=' + options.domain : '';
var secure = options.secure ? '; secure' : '';
document.cookie = [name, '=', encodeURIComponent(value), expires, path, domain, secure].join('');
}
}
/*
get the name cookie
@name:the cookie's name
*/
function myCookie_get(name)
{
var cookieValue = null;
if (document.cookie && document.cookie != '') {
var cookies = document.cookie.split(';');
for (var i = 0; i < cookies.length; i++) {
var cookie = cookies[i].Trim();
// Does this cookie string begin with the name we want?
if (cookie.substring(0, name.length + 1) == (name + '=')) {
cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
break;
}
}
}
return cookieValue;
}
/*
get all the cookie return as a json
*/
function myCookie_getAll()
{
var cookieArray = new Array();
var str="";
var temp;
if (document.cookie && document.cookie != '') {
var cookies = document.cookie.split(';');
for (var i = 0; i < cookies.length; i++) {
var cookie = cookies[i].Trim();
temp=cookie.split('=');
//take the
cookieArray.push("{\"name\":\""+decodeURIComponent(temp[0])+"\",\"value\":\""+decodeURIComponent(temp[1])+"\"}");
}
str=cookieArray.join(",");
}
str="["+str+"]";
return eval('('+str+')');
}

myCookie.add("useraccount","admin",{"expires":5});//加入一个期限为5天的cookie
alert(myCookie.get("useraccount"));//取出cookie
cookies=myCookie.get();//得到所有的cookie
for(var i=0;i<cookies.length;i++)
{
alert(cookies[i]["name"]+":"+cookies[i]["value"]);
}
myCookie.delete("useraccount");//删除刚刚添加的cookie
alert(myCookie.get("useraccount"));