JavaScript Object.isExtensible()

Kafa da Amfani

Object.isExtensible() Hanyar Hanyar don yakin kai wanda ke cikin abin da ake kira. Idan abin da ake kira yana da tsarin yin kari, yana samar da true.

Hanyar Hanyar:

Object.preventExtensions() ba aminu kanam, amfani kanan kuma yadda ake kira.

Object.seal() ba aminu kanam, amfani kanan kuma yadda abin da ake kira.

Object.freeze() Zhi ting xiu gai, tian jia he shanchu shuxing。

Object.isExtensible() Ruguo duanxi ke kuozhan, zai hui fanhui true。

Object.isSealed() Ruguo duanxi shi mianse de, zai hui fanhui true。

Object.isFrozen() Ruguo duanxi bei jiongjie, zai hui fanhui true。

Shili

Lishi 1

// Chuang jian duanxi
const person = {firstName: "Bill", lastName: "Gates"};
// Zhi zhi kuozhan
Object.preventExtensions(person);
// Zhe jiang fanhui false
let answer = Object.isExtensible(person);

Zi jin shi shi

Lishi 2

// Chuang jian shu zu
const fruits = ["Banana", "Orange", "Apple", "Mango"];
// Zhi zhi kuozhan
Object.preventExtensions(fruits);
// Zhe jiang fanhui false
let answer = Object.isExtensible(fruits);

Zi jin shi shi

Yufa

Object.isExtensible(object)

Can shu

Fanhui zhi

Brower zhi chi

Object.isExtensible() Shi ECMAScript5 (ES5) de tezheng.

Zi 2013 nian 7 yue qi, suanmei xian dai hua浏览器 juan quan zhi chi ES5 (JavaScript 2009)：