JS 创建对象(常见的几种方法)(2)

function Person(name,age,job){
this.name = name;
this.age = age;
this.job = job;
}
Person.prototype.sayName= function(){
alert(this.name);
};
var tanya = new Person("tanya","30","female");
var ansel = new Person("ansel","30","male");
tanya.sayName();
ansel.sayName();

实际应用时，不是一成不变的套用某种模式，活学活用。需要共享方法的时候就用原型模式，需要使用副本的时候就用构造模式，还可以结合起来，把所有信息都封装在构造函数中，而通过在构造函数中初始化原型，使得对象保持了同时使用构造函数和原型的优点。

复制代码 代码如下:

function Person(name,age,job){
this.name = name;
this.age = age;
this.job = job;
if (typeof sayName != "function" ){
Person.prototype.sayName= function(){
alert(this.name);
};
}
}
var tanya = new Person("tanya","30","female");
var ansel = new Person("ansel","30","male");
ansel.sayName = function () {
alert("Hi ansel, how hansome you are!");
}
tanya.sayName();
ansel.sayName();

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