JavaScript Object 及相关操作

JavaScript Object提供用户一种定义用户数据类型的方法，JavaScript Object键值对集合的实例，不同于原生数据类型，JavaScript Object可以表现多个或复杂的值，并且这些值可以在其生命期被设置，同时，这些值既可以是标量值也可以是函数、数组或其他对象。本文介绍JavaScript Object的一些相关操作：

定义对象:

// 方式一
var person = {
    name: "Lambda",
    education: {
        primary_school: "LA No.1 Primary",
        middle_school: "LA No.1 Middle",
        university: "LA University"
    },
    getEducation: function() {
        return education;
    },
    experience: [
        "Microsoft",
        "Google",
        "Apple"
    ]
};

// 方式二
var name = "Lambda";

var experience = ["MS", "Google", "Apple"];

var education = {
    primary_school: "LA No.1 Primary",
    middle_school: "LA No.1 Middle",
    university: "LA University"
};

var getEducation = function() {
    return education;
}

var person = {name, education, getEducation, experience};

// 方式三
var v1 = "Lambda";

var v2 = {
    primary_school: "LA No.1 Primary",
    middle_school: "LA No.1 Middle",
    university: "LA University"
};

var v3 = function() {
    return v2;
}

var v4 = ["MS", "Google", "Apple"];

var person = {
    name: v1, 
    education: v2,
    getEducation: v3,
    experience: v4
};

// 方式四，对象构造器
var person = new Object();

person.name = "Lambda";

person.education = {
    primary_school: "LA No.1 Primary",
    middle_school: "LA No.1 Middle",
    university: "LA University"
};

person.getEducation = function() {
    return person.education;
}

person.experience = ["MS", "Google", "Apple"];

// 方式五，对象构造函数
function Car() {
    this.brand = "Ford";
    this.model = "T";
}

var obj = new Car();

// 方式六，Object.create方法
var car = {
    brand: "Ford",
    model: "T"
};

var car1 = Object.create(car);

console.log(car1.brand);    // Ford
console.log(car1.model);    // T
console.log(car1);   // {}

console.log(car);    // { brand: 'Ford', model: 'T' }
console.log(car.brand); // Ford
console.log(car.model); // T

// 方式七，Object.assign方法
var car = {
    brand: "Ford",
    model: "T"
};

var person = {
    name: "Lambda",
    gender: "male"
};

var obj = Object.assign(person, car);

console.log(obj); // {name: 'Lambda', gender: 'male', brand: 'Ford', model: 'T'}

删除对象属性： 

// 删除对象属性
var person = {
    name: "Lambda",
    gender: "male",
};

console.log(person); // { name: 'Lambda', gender: 'male' }

delete person.gender;

console.log(person); // { name: 'Lambda' }

对象比较： 

JavaScript中，Object是引用类型的，因此，即使两个Object的属性完全相同，它们还是两个完全不同的Object. 

// Objects comparing
var person1 = {
    name: "Lambda",
    gender: "male",
};

var person2 = {
    name: "Lambda",
    gender: "male",
};

console.log(person1 == person2); // false
console.log(person1 === person2); // false

var person3 = person1;

console.log(person3 == person1); // true
console.log(person3 === person1); // true

对象解构： 

// 对象解构
var person = {
    name: "Lambda",
    gender: "male",
};

var {name, gender} = person;

console.log(name); // Lambda
console.log(gender); // male