Kuchukua muundo wa JavaScript

Sana ya kusambaza kwa kipindi cha kizingatia

Sana ya kusambaza kwa kipindi cha kizingatia kinasambaza kipimo cha kuzingatia cha kipengele cha kizingatia kwenye thamani.

let {firstName, lastName} = person;

Hata hivyo, tunaweza kusambaza kipindi cha kizingatia na kipengele cha kuingiliana kwa kila kipengele cha kuingiliana.

let [firstName, lastName] = person;

Kusambaza kwa kipindi cha kizingatia

Mivuno

// Kuzia kwa kipindi cha kizingatia
const person = {
  firstName: "Bill",
  lastName: "Gates",
  age: 50
};
// Umuonekano
let {firstName, lastName} = person;

Tafuta tena

U序 wa kipimo cha kuzingatia kinahitaji kumfupi.

Mivuno

// Kuzia kwa kipindi cha kizingatia
const person = {
  firstName: "Bill",
  lastName: "Gates",
  age: 50
};
// Umuonekano
let {lastName, firstName} = person;

Tafuta tena

Thamani za kuzingatia za kipindi cha kizingatia

Kwa sababu ya kipimo cha kuzingatia kinachopita, tunaweza kumwengia thamani kwa thamani za kuzingatia.

Mivuno

// Kuzia kwa kipindi cha kizingatia
const person = {
  firstName: "Bill",
  lastName: "Gates",
  age: 50
};
// Umuonekano
let {firstName, lastName, country = "US"} = person;

Tafuta tena

Mifano ya kusambaza kwa kipindi cha kizingatia

Mivuno

// Kuzia kwa kipindi cha kizingatia
const person = {
  firstName: "Bill",
  lastName: "Gates",
  age: 50
};
// Umuonekano
let {lastName: name} = person;

Tafuta tena

Kusambaza kwa kipindi cha kizingatia

Matumizi ya kusambaza kwa kipindi cha kizingatia ni kusambaza herufu za kipindi cha kizingatia.

Mivuno

// Kuzia kwa kipindi cha kizingatia
let name = "W3Schools";
// Umuonekano
let [a1, a2, a3, a4, a5] = name;

Tafuta tena

Kusambaza thamani kwa kipindi cha kizingatia

Tunaweza kutumia kipindi cha kizingatia kwa kusambaza thamani kwenye kipindi cha kizingatia zaidi.

Mivuno

// Kuanzia kipindi
const fruits = ["Bananas", "Oranges", "Apples", "Mangos"];
// Umuonekano
let [fruit1, fruit2] = fruits;

Tafuta tena

Kumfupi thamani kwa kipindi cha kizingatia

Tunaweza kutumia mabara ya kipindi cha kizingatia kwa kumfupi thamani.

Mivuno

// Kuanzia kipindi
const fruits = ["Bananas", "Oranges", "Apples", "Mangos"];
// Umuonekano
let [fruit1,,,fruit2] = fruits;

Tafuta tena

Kiwango cha kipindi cha kizingatia

Tunaweza kutafuta thamani kwa kiwango cha kipindi cha kizingatia.

Mivuno

// Kuanzia kipindi
const fruits = ["Bananas", "Oranges", "Apples", "Mangos"];
// Umuonekano
let {[0]: fruit1, [1]: fruit2} = fruits;

Tafuta tena

Kipimo cha kuzingatia kipindi cha kiingilizi

Inafikia kwa kumwengia kiwango cha kipindi cha kiingilizi.

此语法会将所有剩余值存储到一个新数组中：

Mivuno

// Kuanzia kipindi
const numbers = [10, 20, 30, 40, 50, 60, 70];
// Umuonekano
const [a, b, ...rest] = numbers;

Tafuta tena

Umuonekano wa Map

Mivuno

// Kuanzia Map
const fruits = new Map([
  ["apples", 500],
  ["bananas", 300],
  ["oranges", 200]
]);
// Umuonekano
let text = "";
for (const [key, value] of fruits) {
  text += key + " is " + value;
}

Tafuta tena

Kumwambia mivuno wa JavaScript

Inaweza kutumia umuonekano wa kusaidia kumwambia mivuno wa kina kwa kina:

Mivuno

let firstName = "Bill";
let lastName = "Gates";
// Umuonekano
[firstName, lastName] = [lastName, firstName];

Tafuta tena