JavaScript Object.isSealed()

ການອະທິບາຍ ແລະ ການນໍາໃຊ້

Object.isSealed() ວິທີການຕ້ອງການກວດກາວ່າບັນດາວັດຖຸຖືກປິດກັນຫຼືບໍ່。ຖ້າບັນດາວັດຖຸຖືກປິດກັນຫຼັງຈາກນັ້ນ ຈະຫຼັງກັບ true。

ວິທີການອື່ນໆ:

Object.preventExtensions() ອະນຸຍາດແກ້ໄຂ ແຕ່ຫ້າມຕີບອກຂໍ້ມູນຫຼັກ。

Object.seal() Allow modification, but prevent addition and deletion of properties.

Object.freeze() Prevent modification, addition, and deletion of properties.

Object.isExtensible() If the object is extensible, it returns true.

Object.isSealed() If the object is sealed, it returns true.

Object.isFrozen() If the object is frozen, it returns true.

Instance

Example 1

// Create an object
const person = {firstName: "Bill", lastName: "Gates"};
// Seal the object
Object.seal(person);
// This will return true
let answer = Object.isSealed(person);

Try It Yourself

Example 2

// Create an array
const fruits = ["Banana", "Orange", "Apple", "Mango"];
// Seal the array
Object.seal(fruits);
// This will return true
let answer = Object.isSealed(fruits);

Try It Yourself

Syntax

Object.isSealed(object)

Parameter

Return Value

Browser Support

Object.isSealed() Is a feature of ECMAScript5 (ES5).

Since July 2013, all modern browsers fully support ES5 (JavaScript 2009):