基本用法：
Ext.util.Cookies.set(‘myCookie’,’myCookieValue’);
参数：
set( name, value, [expires], [path], [domain], [secure] )

注意expires参数：
expires : Date this cookie will expire. Default is browser session and please note that whatever value you pass here will be converted to GMT data
domani: 如果设置 abc.com 那 *.abc.com都可以使用。
secure:https时设置为true
Read more: ​​​http://jaspreetchahal.org/extjs-4-cookies/#ixzz3qywhUeUc​​​
path:默认 ‘/’

设置日期的示例：

var now = new Date();
   var expiry = new Date(now.getTime() + 365 * 24 * 60 * 60 * 1000);
   Ext.util.Cookies.set('myCookie','myCookieValue',expiry);

获取值示例：

var myCookieVal = Ext.util.Cookies.get('myCookie');
   console.log(myCookieVal);

清除cookie

Ext.util.Cookies.clear('myCookie');

文档：
​​​http://docs.sencha.com/extjs/5.1.0/#!/api/Ext.util.Cookies-method-set​​