我是答案的搬运工：
http://stackoverflow.com/questions/12624181/angularjs-how-to-set-expiration-date-for-cookie-in-angularjs

angular.module('cookiesExample', ['ngCookies'])
.controller('ExampleController', ['$cookies', function($cookies) {
  // Find tomorrow's date.
  var expireDate = new Date();
  expireDate.setDate(expireDate.getDate() + 1);
  // Setting a cookie
  $cookies.put('myFavorite', 'oatmeal', {'expires': expireDate});
}]);