jQuery.cookie = function(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('');
    } else { // only name given, get cookie
        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]);
                // 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;
    }
};


(function(){

var window = this,
	doce = null,
	
	
localData = window.localData = function(){
	return localData.init();
};
 
if(window.localStorage){  //for FF > 2.0  当前会话有效
	window.localData = {
		init: function(){
			return this;
		},
		
		sessStorage: localStorage,
		isWork: true,
		
		set: function(key, value){
			this.sessStorage.setItem(key,value);
		},
		
		get: function(key){
			return this.sessStorage.getItem(key);
		},
		
		remove: function(key){
			this.sessStorage.removeItem(key);
		}	
	}
}
else if(!!document.all){  //for ie > 6.0
	doce = document.documentElement;
	doce.addBehavior("#default#userdata");
	window.localData = {
		init: function(){
			return this;
		},
		
		expires:365,   //有效期
		isWork: true,  //判断浏览器是否支持此功能
		
		//设置
		set: function(key, value, exp){
			var d = new Date();
			exp = (arguments.length==3) ? exp : this.expires;
			doce.load(key);
			doce.setAttribute('value', value);
			doce.expires = new Date(d.getDate()+exp).toUTCString();
			doce.save(key);
		},
		
		//获取
		get: function(key){
			doce.load(key);
			return doce.getAttribute('value');
		},
		
		//删除
		remove: function(key){
			doce.load(key);
			doce.expires = new Date(315532799000).toUTCString();
			doce.save(key);
		}	
	}
}
else
{   //浏览器不支持
	window.localData = {
		init: function(){
			return false;
		}
	}
}
})();