analytics.js
function User(options) {
  this.defaults = User.defaults;
  this.debug = debug;
  Entity.call(this, options);
}
function User(options) {
  this.defaults = User.defaults;
  this.debug = debug;
  Entity.call(this, options);
}
function User ( options ) { this . defaults = User . defaults ; this . debug = debug ; Entity . call ( this , options ) ; }
Initialize a new `User` with `options`.

@param {Object} options
Initialize a new User with options .