JavaScript寄生组合式继承原理与用法分析

function inheritPrototype(subType, superType){
  var prototype = Object.create(superType.prototype); //创建超类型原型副本
  prototype.constructor = subType;          //修改原型副本的不同属性
  subType.prototype = prototype;           //指定原型
}
function SuperType(name){
  this.name = name;
  this.colors = ["red", "blue", "green"];
}
SuperType.prototype.sayName = function(){
  console.log(this.name);
}
function SubType(name, age){
  //继承属性
  SuperType.call(this, name);
  //实例属性
  this.age = age;
}
//继承方法
inheritPrototype(SubType, SuperType);
SubType.prototype.sayAge = function(){
  console.log(this.age);
};
var instance1 = new SubType("Nicholas", 29);
instance1.colors.push("black");
console.log(instance1.colors); //"red, blue, green, black"
instance1.sayName();      //"Nicholas"
instance1.sayAge();      //29