jQuery 如何存储，获取和删除 Cookies

jQuery.cookie = function(name, value, options) {
if (typeof value != 'undefined') {
options = options || {};
if (value === null) {
value = '';
options = $.extend({}, options);
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();
}
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('');
} else {
var cookieValue = null;
if (document.cookie && document.cookie != '') {
var cookies = document.cookie.split(';');
for (var i = 0; i < cookies.length; i++) {
var cookie = jQuery.trim(cookies[i]);
if (cookie.substring(0, name.length + 1) == (name + '=')) {
cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
break;
}
}
}
return cookieValue;
}
};

$(document).ready(function() {
$('#write_cokies').click(function(){
$.cookie('name', 'test',{expires: 7});
});
$('#read_ookies').click(function(){
var test = $.cookie('name');
alert (test);
});
$('#delete_cookies').click(function(){
$.cookie('name', null);
});
});