JS比较思维模型

function Foo(who){
             this.me = who;
         }
         Foo.prototype.identify = function(){
             return "I am"+this.me;
         };
         function Bar(who){
             Foo.call(this,who);
         }
         Bar.prototype = Object.create(Foo.prototype);
         Bar.prototype.speak = function(){
             alert("Hello,"+this.identify()+".");
         };
         var b1 = new Bar("b1");
         var b2 = new Bar("b2");
         b1.speak();
         b2.speak();

Foo = {
             init:function(who){
                 this.me = who;
             },
             identify:function(){
                 return "I am"+this.me;
             }
         };
         Bar = Object.create(Foo);
         Bar.speak = function(){
             alert("Hello,"+this.identify()+".");
         };
         var b1 = Object.create(Bar);
         b1.init("b1");
         var b2 = Object.create(Bar);
         b2.init("b2");
         b1.speak();
         b2.speak();