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                ## 一、Javascript中“類”的定義方式 1、 ~~~ function Person(name,age) { this.age=age; this.name=name; this.show=function() { return ("my name is "+this.name+",and my age is "+this.age); } } var per = new Person("yuan",20); alert(per.show()); ~~~ 2、 ~~~ function Person(name,age) { var o = new Object; o.name=name; o.age=age; o.show=function() { return ("my name is "+o.name+",and my age is "+o.age); } return o; } var per = new Person("yuan",20); alert(per.show()); ~~~ 3、 ~~~ var per= { name:"yuan", age:20, show:function() { return ("my name is "+this.name+",and my age is "+this.age); } } alert(per.show()); ~~~ 以上三種方式的輸出結果相同。 ## 二 、獲取構造器方法 ?所有構造器均是類,但并非所有類是構造器。內建類都是用構造器創建對象,而宿主對象(window等)則不是,對于實例對象而言,利用其constructor屬性,可獲取構造器方法: ~~~ function Person(name,age) { this.name=name; this.age=age; this.show=function() { return ("my name is "+this.name+",and my age is "+this.age); } } var per = new Person("yuan",20); alert(per.constructor); ~~~ 運行結果: ![](https://box.kancloud.cn/2016-08-30_57c54ec541261.jpg) 內建類和宿主對象的constructor屬性不能得到構造方法。 ## 三 、使用prototype屬性定義方法和屬性 ? 除了在類的構造器定義方法和屬性外,也可以用prototype定義。 ~~~ <span style="font-size:18px;">function Person(){} Person.prototype.name="yuan"; //定義屬性 Person.prototype.age=20; Person.prototype.show=function() //定義方法 { return ("my name is "+this.name+",and my age is "+this.age); } var per = new Person; alert(per.show());</span> ~~~ ## 四 、類的成員的訪問控制 ? 1、public成員:使用this和prototype定義的屬性和方法是公共成員,可以在腳本的任何位置訪問 ? 2、private成員:定義屬性用var,定義方法時采用命名函數或者匿名函數
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