function Person(){
 this.name = 'Simon';
}
Person.prototype.say = function(){
 alert('My name is '+this.name);
}
function F2E(id){
 this.id = id;
 this.showId = function(){
 alert('Good morning,Sir,My work number is '+this.id);
 }
}
F2E.prototype = new Person();

var simon = new F2E(9527);
simon.say();
simon.showId();
alert(simon.hasOwnProperty('id')); //檢查是否為自身屬性

F2E.prototype = new Person()

function Person(name){
 this.name = name;
}
Person.prototype.say = function(){
 alert('My name is '+this.name);
}
function F2E(name,id){
 this.id = id;
 this.showId = function(){
 alert('Good morning,Sir,My work number is '+this.id);
 }
}
F2E.prototype = new Person();

var simon = new F2E("Simon",9527);
simon.say();
simon.showId();

 
function Person(name){
 this.name = name;
}

Person.prototype.say = function(){
 alert('My name is '+this.name);
}

function F2E(name,id){
 this.id = id;
 this.showId = function(){
 alert('Good morning,Sir,My work number is '+this.id);
 }
}

F2E.prototype = new Person(); //此處無法進(jìn)行傳值，this.name或者name都不行，直接寫F2E.prototype = new Person('wood')是可以的，但是這樣的話simon.say()就變成了My name is wood

var simon = new F2E("Simon",9527);
simon.say(); //彈出 My name is undefined
simon.showId();

function Person(name){
 this.name = name;
}
Person.prototype.say = function(){
 alert('My name is '+this.name);
}
function F2E(name,id){
 Person.call(this,name);
 this.id = id;
}
F2E.prototype = new Person(); 
//此處注意一個細(xì)節(jié)，showId不能寫在F2E.prototype = new Person();前面
F2E.prototype.showId = function(){
 alert('Good morning,Sir,My work number is '+this.id);
}
var simon = new F2E("Simon",9527);
simon.say();
simon.showId();