A detailed profile of an object

What is an object

A collection of pairs of variable names and values

var obj = {
    name: 'Fitz'.age: 20
}
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Why use objects

Better management of associated groups of data

// Use objects to manage student Fitz's personal information
var Fitz = {
    name: 'Fitz'.age: 21.major: 'E-commerce'
}

// If you declare directly in the global scope instead of using objects, it will be difficult to make connections between data
var name = 'Lx'
var age = 21
var major = 'International commerce'
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Object composition

• attribute
• methods

A method is a special kind of property, special in that its property value is a function

// Object composition
var obj = {
    name: 'Fitz'.// Attributes in the obj object
    wantToFindJob: function () {    // methods in obj objects
        console.log('Fitz wants to find front-end work ')}}Copy the code

How properties and methods in an object are accessed

Access, this method is simple to code, can be concise, fast access to the attributes of the object

var person = {
    name: 'Fitz',
    sayHello () {
        console.log('hello')}}console.log(person.name)    //'Fitz'
person.sayHello()           // 'hello'
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Note: If the attribute name is a variable or a special variable name such as Content-Type, the attribute value must be obtained by []

var person = {
    name: 'Fitz'.age: 21
}

console.log(person['age'])  / / 21

for (let i in obj){
    console.log(person[i])  // 'Fitz' 21
}
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