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Js面向?qū)ο蟮乃膶?-Axel Rauschmayer

Alex / 1419人閱讀

摘要:原型鏈和簡單對象一樣獲取和設(shè)置原型第三層構(gòu)造器的構(gòu)造器如何消除冗余特性的屬性共享屬性是怎么工作的檢查是否在的原型鏈上。

第一層 單一對象 創(chuàng)建對象

對象:字符和數(shù)值的映射

屬性:訪問映射

方法:屬性的值是函數(shù)

this 指向函數(shù)的接受者

var jane ={
    //屬性
    name="Jane",
    
    //方法
    describe:function(){
        return "Person named"+this.name;
    }

https://www.youtube.com/watch?v=VJOTcUsD2kA&t=6m16s

對象和映射(map) 相同點(diǎn):

非常動態(tài):自由刪除增加屬性

不同點(diǎn):

繼承(原型鏈繼承)

快速訪問屬性(通過構(gòu)造器器)

第二層 原型鏈 prototype chains

引出共享屬性

var jane = {
    name:"jane",
    describe:function(){
        return "Person named" +this.name;
    }

};

var tarzan = {
    name:"Tarzan",
    describe:function(){
        return "Person named" + this.name;
    }
};

解決方案:通過原型繼承

jane 和 tarzan 通過共享一個原型對象。

原型鏈和簡單對象一樣

var PersonProto ={
    describe:function(){
        return  "Person named" +this.name;
    }
}

var jane = {
    __proto__:PersonProto,
    name:"Jane"

};
var tarzan = {
    __proto__:PersonProto,
    name:"Tarzan"
};
獲取和設(shè)置原型

es6: _proto _

es5:

Object.create()

Object.getPrototypeOf()

Obejct.create(proto):

var PersonProto = {
    decribe:function(){
        return "Pseson named" + this.name;
    }
};

var jane = Object.create(PersonProto);
jane.name="Jane";

Object.getPrototypeOf(obj):

# Object.getPrototypeOf(jane) === PersonProto
true
第三層 構(gòu)造器

persons的構(gòu)造器

 function Person(name){
    this.name = name;
    this.decsribe = funciont(){
        return "Person named" + this.name;
    };
 }
 
 var jane = new Person ("Jane");
 console.log(jane instanceof Person); //true

如何消除冗余?
//特性的屬性
 function Person(name){
    this.name = name;
 }
 
 //共享屬性
 Person.prototype.describe = function(){
    return  "Person named"+ this.name;
 }

instanceof是怎么工作的?

value instanceof Constr

檢查 constructor.prototype是否在value的原型鏈上。
Constr.prototype.isPrototypeOf(value)

第四層 構(gòu)造器的繼承

目標(biāo): employee 繼承 Person

function Person(name){
    this.name = name;
}
Person.prototype.sayHelloto = function (otherName){
    console.log(this.name +"says hello to" + otherName);
}
Person.prototype.describe = function(){
    return "Person named" + this.name;
}

Employee(name,title)和Person一樣,除了:

其他屬性:title

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