JavaScript Object.preventExtensions()

tafida da amfani

Object.preventExtensions() hanyar hanyar don kaiwa kan dace da a dace gurɗe zuwa abin.

za a iya amfani da Object.isExtensible() sake saiwa ce sabon abin da ke cikin abin da ake kira.

hanyar hanyar:

Object.preventExtensions() kabara a dake, lai kaiwa kan dace da a dace gurɗe.

Object.seal() kabara a dake, lai kaiwa kan dace da a dace gurɗe.

Object.freeze() a gudanar da sauki, a fiyi a kara da, a kaiwa cikin cikin cikin.

Object.isExtensible() idancen kiɗan za a sami tura ko tura.

Object.isSealed() idancen kiɗan za a sami tura ko tura.

Object.isFrozen() idancen kiɗan za a sami tura ko tura.

hanyar

masu ƙirƙirar 1

// ana ƙirƙirin jiki
const person = {firstName: "Bill", lastName: "Gates"};
// a gudanar da sauki
Object.preventExtensions(person);
// A cikin sabon kuma, za a sami rashin faruwa
person.nationality = "English";

sai sai

masu ƙirƙirar 2

// ana ƙirƙirin ƙa'idodin
const fruits = ["Banana", "Orange", "Apple", "Mango"];
Object.preventExtensions(fruits);
// A cikin sabon kuma, za a sami rashin faruwa:
fruits.push("Kiwi");

sai sai

kalmar

Object.preventExtensions(object)

masu sauki

sauki

sauki browsers

Object.preventExtensions() ya yi lafiya da ɗan ECMAScript5 (ES5).

Daga shekara 2013 7 ta hanyar, duk browsers masu zaman lafiya suka sami nasarar gudanar da ES5 (JavaScript 2009):