281 对象的创建模式：Object构造函数模式，对象字面量模式，构造函数模式，工厂模式，构造函数+原型的组合模式

• Object构造函数模式

  p = new Object()
  p.name = 'aa'
  p.age = 11
  p.setName = function(name){this.name=name}
  console.log(p);  // {name: "aa", age: 11, setName: ƒ}

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• 对象字面量模式

  var obj = {
    name : 'Tom',
    setName : function(name){this.name = name}
  }

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• 构造函数模式

  function Person(name, age) {
    this.name = name;
    this.age = age;
    this.setName = function(name){this.name=name;};
  }
  new Person('tom', 12);

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• 构造函数+原型的组合模式

  function Person(name, age) {
    this.name = name;
    this.age = age;
  }
  Person.prototype.setName = function(name){this.name=name;};
  new Person('tom', 12);

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