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Object.getPrototypeOf() 回傳指定物件的原型,換句話說,就是取得該物件的 [[Prototype]] 屬性的值).

表達式

Object.getPrototypeOf(obj)

參數

obj
欲取得原型的物件。

範例

var proto = {};
var obj = Object.create(proto);
Object.getPrototypeOf(obj) === proto; // true

備註

如果 obj 參數在 ES5 並不是物件時會拋出 TypeError 例外,同樣狀況在 ES6 時該參數將會被強制轉換成 Object

Object.getPrototypeOf("foo");
// TypeError: "foo" is not an object (ES5 code)
Object.getPrototypeOf("foo");
// String.prototype                  (ES6 code)

規範

Specification Status Comment
ECMAScript 5.1 (ECMA-262)
The definition of 'Object.getPrototypeOf' in that specification.
Standard Initial definition.
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'Object.getProtoypeOf' in that specification.
Standard  

瀏覽器相容性

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support 5 3.5 (1.9.1) 9 12.10 5
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support ? ? ? ? ? ?

Opera 註

雖然舊版的 Opera 並不支援 Object.getPrototypeOf(),但是 Opera 從 Opera 10.50 支援非標準的 __proto__ 屬性。

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