javascript 继承

    //对象冒充实现继承
    function Person() {
        this.speak = function () {
            alert("我是人类");
        };
    }

    function Chinese() {
        Person.call(this);
    }
    var p = new Chinese();
    p.speak();

//对象冒充与原型继承
    function Person(sColor) {
        this.color = sColor;
    }

    Person.prototype.sayColor = function () {
        alert(this.color);
    };

    function Chinese(sColor, sName) {

        Person.call(this, sColor);//对象冒充继承属性

        this.name = sName;
    }

    Chinese.prototype = new Person();//原型继承方法

    Chinese.prototype.sayName = function () {
        alert(this.name);
    };

    var p = new Chinese("red", "高聪");
    p.sayColor();
    p.sayName();

//Shape - superclass
function Shape() {
  this.x = 0;
  this.y = 0;
}

Shape.prototype.move = function(x, y) {
    this.x += x;
    this.y += y;
    console.info("Shape moved.");
};

// Rectangle - subclass
function Rectangle() {
  Shape.call(this); //call super constructor.
}

Rectangle.prototype = Object.create(Shape.prototype);

var rect = new Rectangle();

rect instanceof Rectangle //true.
rect instanceof Shape //true.

rect.move(1, 1); //Outputs, "Shape moved."

该方法属于ES5规范，如果浏览器环境不支持也可以自行实现，如下：

Object.create = Object.create || function (obj) {
            var F = function () {};
            F.prototype = obj;
            return new F();
        }