cc.js.extend

Extend

// 例子：浅拷贝
var a = {};
var b = {c:1, d:2};
for(var i in b){
  a[i] = b[i];
}
// 封装，对引用类型（数组、对象）没有用
function extend(sub,sup){
  for(var i in sup){
    sub[i] = sup[i];
  }
}

继承

var People = function (){
  this.name = 'rzy';
}
People.prototype.getName = function(){
  return this.name;
}
var Man = function (){
  this.sex = 'male';
  People.call(this);
}
/* 土鳖方法，加入后期People中的name改变了，那Man的值也会改变
Man.prototype = People.prototype;
var man = new Man();
man.getName(); // rzy
*/
Man.prototype = new People();
Man.prototype.constructor = Man;
var man = new Man();
man.getName();  // rzy

示例

// ------------ Base class ----------------
let BaseCls = function () {
 this.name = "base class";
 this.ok = true;
};

BaseCls.prototype.printName = function () {
 console.log(this.name);
};

// ------------ Ext class ----------------
let ExtCls = function () {
 BaseCls.call(this);
 this.name = "Ext class";
};
// extend before set new prototype functions, avoid override by extend()
cc.js.extend(ExtCls, BaseCls);
// set new prototype
ExtCls.prototype.printName = function () {
 BaseCls.prototype.printName.call(this);
 console.log("==== ext add info ===");
 console.log(this.ok);
};

var bs = new BaseCls();
bs.printName();
var ex = new ExtCls();
ex.printName();
输出:

base class
Ext class
==== ext add info ===
true

原文：https://blog.csdn.net/ruizhengyun/article/details/43537371
http://www.tyrantek.com/archives/579/

http://www.tyrantek.com/archives/579/