storage.js

/**
 * Simple storage warpper.
 * @module storage
 * @author Allex Wang (http://iallex.com)
 */
(function (define) {
  define('storage', function (require) {
    var storage = null;

    var localStorage = window.localStorage;
    if (localStorage) {
      storage = {
        get: function(k, parse) {
          var v = localStorage.getItem(k);
          if (parse) { v = JSON.parse(v); }
          return v;
        },
        set: function(k, v) {
          if (typeof v !== 'string') {
            v = JSON.stringify(v);
          }
          localStorage.setItem(k, v);
        },
        remove: function(k) {
          localStorage.removeItem(k);
        }
      };
    }
    else {
      /**
       * Get or set cookies with specific name.
       * @param {String} name Cookie name.
       * @param {String} value (Optional) the cookie value, set to `NULL` to remove cookie values
       * @param {Number|Date} expires (Optional) day? * 30(days).
       * @author Allex Wang (allex.wxn@gmail.com)
       */
      function cookie(name, value, expires, domain) {
        if (value === undefined) {
          name += '=';
          value = document.cookie.split(';');
          for (var i = 0, l = value.length; i < l; i++) {
            for (domain = value[i]; domain.charAt(0) === ' ';) domain = domain.substring(1, domain.length);
            if (domain.indexOf(name) === 0) {
              return decodeURIComponent(domain.substring(name.length, domain.length));
            }
          }
          return null;
        } else {
          var date = '', isnum;
          if (value === null) {
            value = '';
            expires = -1;
          }
          if ( (isnum = typeof expires === 'number') || expires instanceof Date ) {
            if (isnum) {
              date = new Date;
              date.setTime(date.getTime() + expires * 864E5); // 30 days
            } else {
              date = expires;
            }
            date = '; expires=' + date.toUTCString();
          }
          document.cookie = name + '=' + value + date + '; path=/' + (domain ? ';domain=' + domain : '');
        }
      }
      storage = {
        get: function(k, parse) {
          var v = cookie(k);
          if (parse) {
            v = JSON.parse(v);
          }
          return v;
        },
        set: function(k, v) {
          if (typeof v !== 'string') {
            v = JSON.stringify(v);
          }
          cookie(k, v);
        },
        remove: function(k) {
          cookie(k, null);
        }
      };
    }

    return storage;
  });
}(typeof define === 'function' && define.amd ? define : function (id, factory) {
  if (typeof module !== 'undefined' && module.exports) {
    //Node
    module.exports = factory(require);
  } else {
    //Create a global function. Only works if the code does not have
    //dependencies, or dependencies fit the call pattern below.
    window[id] = factory(function(value) { return window[value]; });
  }
}));