面向对象风格与对象关联风格

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对相关联：

Foo={
    init:function(name){
        this.name=name;
    },
    sayName:function(){
        return 'I am '+this.name;
    }
};
Bar=Object.create(Foo);    //*
Bar.greet=function(){
	return 'Hello, '+this.sayName()+'.';
}
var b1=Object.create(Bar);
b1.init('Tom');                 //*
var b2=Object.create(Bar);
b2.init('Mary');                //*

b1.greet();        //"Hello, I am Tom."
b2.greet();        //"Hello, I am Mary."

面向对象：

function Foo(name){
    this.me=name;
}
Foo.prototype.sayName=function(){
    return 'I am '+this.me;
}
function Bar(name){
    Foo.call(this,name);    //*
}
Bar.prototype=Object.create(Foo.prototype);
Bar.prototype.greet=function(){
    return 'Hello, '+this.sayName()+'.';
}

var b1=new Bar('tom');    //*
var b2=new Bar('mary');    //*

b1.greet();        //"Hello, I am tom."
b2.greet();        //"Hello, I am mary."
b1.sayName();      //"I am tom."