javascript的面向对象特性是什么-创新互联
这篇文章主要介绍“javascript的面向对象特性是什么”,在日常操作中,相信很多人在javascript的面向对象特性是什么问题上存在疑惑,小编查阅了各式资料,整理出简单好用的操作方法,希望对大家解答”javascript的面向对象特性是什么”的疑惑有所帮助!接下来,请跟着小编一起来学习吧!
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封装(把相关的信息(无论数据或方法)存储在对象中的能力)
继承(由另一个类(或多个类)得来类的属性和方法的能力)
多态(一个对象在不同情况下的多种形态)
定义类或对象
第一种:基于Object对象
var person = new Object(); person.name = "Rose"; person.age = 18; person.getName = function () { return this.name; }; console.log(person.name);//Rose console.log(person.getName);//function () {return this.name;} console.log(person.getName());//Rose
缺点:不能创建多个对象。
第二种:基于字面量方式
var person = { name : "Rose", age : 18 , getName : function () { return this.name; } }; console.log(person.name);//Rose console.log(person.getName);//function () {return this.name;} console.log(person.getName());//Rose
优点:比较清楚的查找对象包含的属性和方法;
缺点:不能创建多个对象。
第三种:工厂模式
方式一:
function createPerson(name,age) { var object = new Object(); object.name = name; object.age = age; object.getName = function () { return this.name; }; return object; } var person1 = createPerson("Rose",18); var person2 = createPerson("Jack",20); console.log(person1.name);//Rose console.log(person2.name);//Jack console.log(person1.getName === person2.getName);//false//重复生成函数,为每个对象都创建独立的函数版本
优点:可以创建多个对象;
缺点:重复生成函数getName(),为每个对象都创建独立的函数版本。
方式二:
function createPerson(name,age) { var object = new Object(); object.name = name; object.age = age; object.getName = getName; return object; } function getName() { return this.name; } var person1 = createPerson("Rose",18); var person2 = createPerson("Jack",20); console.log(person1.name);//Rose console.log(person2.name);//Jack console.log(person1.getName === person2.getName);//true//共享同一个函数
优点:可以创建多个对象;
缺点:从语义上讲,函数getName()不太像是Person对象的方法,辨识度不高。
第四种:构造函数方式
方式一:
function Person(name,age) { this.name = name; this.age = age; this.getName = function () { return this.name; } } var person1 = new Person("Rose",18); var person2 = new Person("Jack",20); console.log(person1.name);//Rose console.log(person2.name);//Jack console.log(person1.getName === person2.getName); //false//重复生成函数,为每个对象都创建独立的函数版本
优点:可以创建多个对象;
缺点:重复生成函数getName(),为每个对象都创建独立的函数版本。
方式二:
function Person(name,age) { this.name = name; this.age = age; this.getName = getName ; } function getName() { return this.name; } var person1 = new Person("Rose",18); var person2 = new Person("Jack",20); console.log(person1.name);//Rose console.log(person2.name);//Jack console.log(person1.getName === person2.getName); //true//共享同一个函数
优点:可以创建多个对象;
缺点:从语义上讲,函数getName()不太像是Person对象的方法,辨识度不高。
第五种:原型方式
function Person() { } Person.prototype.name = 'Rose'; Person.prototype.age = 18; Person.prototype.getName = function () { return this.name; }; var person1 = new Person(); var person2 = new Person(); console.log(person1.name);//Rose console.log(person2.name);//Rose//共享同一个属性 console.log(person1.getName === person2.getName);//true//共享同一个函数
缺点:它省略了为构造函数传递初始化参数,这在一定程序带来不便;另外,最主要是当对象的属性是引用类型时,它的值是不变的,总是引用同一个外部对象,所有实例对该对象的操作都会影响其它实例:
function Person() { } Person.prototype.name = 'Rose'; Person.prototype.age = 18; Person.prototype.lessons = ["语文","数学"]; Person.prototype.getName = function () { return this.name; }; var person1 = new Person(); person1.lessons.push("英语"); var person2 = new Person(); console.log(person1.lessons);//["语文", "数学", "英语"] console.log(person2.lessons);//["语文", "数学", "英语"]//person1修改影响了person2
第六种:构造函数+原型方式(推荐)
function Person(name,age) { this.name = name; this.age = age; } Person.prototype.getName = function () { return this.name; }; var person1 = new Person('Rose', 18); var person2 = new Person('Jack', 20); console.log(person1.name);//Rose console.log(person2.name);//Jack console.log(person1.getName === person2.getName);//true//共享原型中定义的方法
缺点:属性定义在构造函数内,方法定义在构造函数外,与面向对象的封装思想不符。
第七种:构造函数+动态原型方式(推荐)
方式一:
function Person(name,age) { this.name = name; this.age = age; if (typeof Person._getName === "undefined"){ Person.prototype.getName = function () { return this.name; }; Person._getName = true; } } var person1 = new Person('Rose', 18); var person2 = new Person('Jack', 20); console.log(person1.name);//Rose console.log(person2.name);//Jack console.log(person1.getName === person2.getName);//true//共享原型中定义的方法
方式二:
function Person(name,age) { this.name = name; this.age = age; if (typeof this.getName !== "function"){ Person.prototype.getName = function () { return this.name; }; } } var person1 = new Person('Rose', 18); var person2 = new Person('Jack', 20); console.log(person1.name);//Rose console.log(person2.name);//Jack console.log(person1.getName === person2.getName);//true//共享原型中定义的方法
对象属性的扩展及删除
Javascript的对象可以使用 '.' 操作符动态的扩展其属性,可以使用 'delete' 关键字或将属性的值设置为 'undefined' 来删除属性。
function Person(name,age) { this.name = name; this.age = age; if (typeof Person._getName === "undefined"){ Person.prototype.getName = function () { return this.name; }; Person._getName = true; } } var person = new Person("Rose",18); person.job = 'Engineer';//添加属性 console.log(person.job);//Engineer delete person.job;//删除属性 console.log(person.job);//undefined//删除属性后值为undefined person.age = undefined;//删除属性 console.log(person.age);//undefined//删除属性后值为undefined
对象属性类型
数据属性
特性:
[configurable]:表示能否使用delete操作符删除从而重新定义,或能否修改为访问器属性。默认为true;
[enumberable]:表示是否可通过for-in循环返回属性。默认true;
[writable]:表示是否可修改属性的值。默认true;
[value]:包含该属性的数据值。读取/写入都是该值。默认为undefined;如上面实例对象person中定义了name属性,其值为'My name',对该值的修改都反正在这个位置
function Person(name,age) { this.name = name; this.age = age; if (typeof Person._getName === "undefined"){ Person.prototype.getName = function () { return this.name; }; Person._getName = true; } } var person = new Person("Rose",18); Object.defineProperty(person,"name",{configurable:false,writable:false}); person.name = "Jack"; console.log(person.name);//Rose//重新赋值无效 delete person.name; console.log(person.name);//Rose//删除无效
注意:
一旦将configurable设置为false,则无法再使用defineProperty将其修改为true(执行会报错:cannot redefine property : propertyName)
function Person(name,age) { this.name = name; this.age = age; if (typeof Person._getName === "undefined"){ Person.prototype.getName = function () { return this.name; }; Person._getName = true; } } var person = new Person("Rose",18); Object.defineProperty(person,"name",{configurable:false,writable:false}); person.name = "Jack"; console.log(person.name);//Rose//重新赋值无效 delete person.name; console.log(person.name);//Rose//删除无效 Object.defineProperty(person,"name",{configurable:true,writable:true});//Cannot redefine property: name
访问器属性
特性:
[configurable]:是否可通过delete操作符删除重新定义属性;
[numberable]:是否可通过for-in循环查找该属性;
[get]:读取属性时调用,默认:undefined;
[set]:写入属性时调用,默认:undefined;
访问器属性不能直接定义,必须使用defineProperty()或defineProperties来定义:如下
function Person(name,age) { this.name = name; this._age = age; if (typeof Person._getName === "undefined"){ Person.prototype.getName = function () { return this.name; }; Person._getName = true; } } var person = new Person("Rose",18); Object.defineProperty(person,"age",{ get:function () { return this._age; }, set:function (age) { this._age = age; }}); person.age = 20; console.log(person.age);//20//person.age=20是使用set方法将20赋值给_age,person.age是使用get方法将_age的读取出来 console.log(person._age);//20
获取所有的属性和属性的特性
使用Object.getOwnPropertyNames(object)方法可以获取所有的属性;
使用Object.getOwnPropertyDescriptor(object,property)方法可以取得给定属性的特性;
function Person(name,age) { this.name = name; this._age = age; if (typeof Person._getName === "undefined"){ Person.prototype.getName = function () { return this.name; }; Person._getName = true; } } var person = new Person("Rose",18); Object.defineProperty(person,"age",{ get:function () { return this._age; }, set:function (age) { this._age = age; }}); console.log(Object.getOwnPropertyNames(person));//["name", "_age", "age"] console.log(Object.getOwnPropertyDescriptor(person,"age"));//{enumerable: false, configurable: false, get: function, set: function}
对于数据属性,可以取得:configurable,enumberable,writable和value;
对于访问器属性,可以取得:configurable,enumberable,get和set;
继承机制实现
对象冒充
function Father(name) { this.name = name ; this.getName = function () { return this.name; } } function Son(name,age) { this._newMethod = Father; this._newMethod(name); delete this._newMethod; this.age = age; this.getAge = function () { return this.age; } } var father = new Father("Tom"); var son = new Son("Jack",18); console.log(father.getName());//Tom console.log(son.getName());//Jack//继承父类getName()方法 console.log(son.getAge());//18
多继承(利用对象冒充可以实现多继承)
function FatherA(name) { this.name = name ; this.getName = function () { return this.name; } } function FatherB(job) { this.job = job; this.getJob = function () { return this.job; } } function Son(name,job,age) { this._newMethod = FatherA; this._newMethod(name); delete this._newMethod; this._newMethod = FatherB; this._newMethod(job); delete this._newMethod; this.age = age; this.getAge = function () { return this.age; } } var fatherA = new FatherA("Tom"); var fatherB = new FatherB("Engineer"); var son = new Son("Jack","Programmer",18); console.log(fatherA.getName());//Tom console.log(fatherB.getJob());//Engineer console.log(son.getName());//Jack//继承父类FatherA的getName()方法 console.log(son.getJob());//Programmer//继承父类FatherB的getJob()方法 console.log(son.getAge());//18
call()方法
function Father(name) { this.name = name ; this.getName = function () { return this.name; } } function Son(name,job,age) { Father.call(this,name); this.age = age; this.getAge = function () { return this.age; } } var father = new Father("Tom"); var son = new Son("Jack","Programmer",18); console.log(father.getName());//Tom console.log(son.getName());//Jack//继承父类getName()方法 console.log(son.getAge());//18
多继承(利用call()方法实现多继承)
function FatherA(name) { this.name = name ; this.getName = function () { return this.name; } } function FatherB(job) { this.job = job; this.getJob = function () { return this.job; } } function Son(name,job,age) { FatherA.call(this,name); FatherB.call(this,job); this.age = age; this.getAge = function () { return this.age; } } var fatherA = new FatherA("Tom"); var fatherB = new FatherB("Engineer"); var son = new Son("Jack","Programmer",18); console.log(fatherA.getName());//Tom console.log(fatherB.getJob());//Engineer console.log(son.getName());//Jack//继承父类FatherA的getName()方法 console.log(son.getJob());//Programmer//继承父类FatherB的getJob()方法 console.log(son.getAge());//18
apply()方法
function Father(name) { this.name = name ; this.getName = function () { return this.name; } } function Son(name,job,age) { Father.apply(this,new Array(name)); this.age = age; this.getAge = function () { return this.age; } } var father = new Father("Tom"); var son = new Son("Jack","Programmer",18); console.log(father.getName());//Tom console.log(son.getName());//Jack//继承父类getName()方法 console.log(son.getAge());//18
多继承(利用apply()方法实现多继承)
function FatherA(name) { this.name = name ; this.getName = function () { return this.name; } } function FatherB(job) { this.job = job; this.getJob = function () { return this.job; } } function Son(name,job,age) { FatherA.apply(this,new Array(name)); FatherB.apply(this,new Array(job)); this.age = age; this.getAge = function () { return this.age; } } var fatherA = new FatherA("Tom"); var fatherB = new FatherB("Engineer"); var son = new Son("Jack","Programmer",18); console.log(fatherA.getName());//Tom console.log(fatherB.getJob());//Engineer console.log(son.getName());//Jack//继承父类FatherA的getName()方法 console.log(son.getJob());//Programmer//继承父类FatherB的getJob()方法 console.log(son.getAge());//18
原型链方法
function Father() { } Father.prototype.name = "Tom"; Father.prototype.getName = function () { return this.name; }; function Son() { } Son.prototype = new Father(); Son.prototype.age = 18; Son.prototype.getAge = function () { return this.age; }; var father = new Father(); var son = new Son(); console.log(father.getName());//Tom console.log(son.getName());//Tom//继承父类FatherA的getName()方法 console.log(son.getAge());//18
混合方式(call()+原型链)
function Father(name) { this.name = name; } Father.prototype.getName = function () { return this.name; }; function Son(name,age) { Father.call(this,name); this.age = age; } Son.prototype = new Father(); Son.prototype.getAge = function () { return this.age; }; var father = new Father("Tom"); var son = new Son("Jack",18); console.log(father.getName());//Tom console.log(son.getName());//Jack//继承父类Father的getName()方法 console.log(son.getAge());//18
多态机制实现
function Person(name) { this.name = name; if (typeof this.getName !== "function"){ Person.prototype.getName = function () { return this.name; } } if (typeof this.toEat !== "function"){ Person.prototype.toEat = function (animal) { console.log( this.getName() + "说去吃饭:"); animal.eat(); } } } function Animal(name) { this.name = name; if (typeof this.getName !== "function"){ Animal.prototype.getName = function () { return this.name; } } } function Cat(name) { Animal.call(this,name); if (typeof this.eat !== "function"){ Cat.prototype.eat = function () { console.log(this.getName() + "吃鱼"); } } } Cat.prototype = new Animal(); function Dog(name) { Animal.call(this,name); if (typeof this.eat !== "function"){ Dog.prototype.eat = function () { console.log(this.getName() + "啃骨头"); } } } Dog.prototype = new Animal(); var person = new Person("Tom"); person.toEat(new Cat("cat"));//Tom说去吃饭:cat吃鱼 person.toEat(new Dog("dog"));//Tom说去吃饭:dog啃骨头
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