Decorator Design Pattern for JS

decorator.js

var Task = function (name) {
  this.name = name;
  this.completed = false;
  //implicit return this here;
}

Task.prototype.save = function() {
  console.log("saving...");
}

Task.prototype.complete = function() {
  console.log("completing...");
}

var myTask = new Task("new task");
myTask.save();
myTask.complete();

var UrgentTask = function(name, priority) {
  //Inits super
  Task.call(this.name);
  this.priority = priority;
}
//Creates a new prototype object for UrgentTask based on Task's
UrgentTask.prototype = Object.prototype(Task.prototype);