javascript - Some questions about object property descriptors and prototypes in JS-PHP Chinese Network Q&A

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javascript - Some questions about object property descriptors and prototypes in JS

三叔 2017-07-05 10:37:23

847

Define an object and get the descriptor of a certain attribute: for example

let obj = {name: 'Andy'}; let descriptor = Object.getOwnPropertyDescriptor(obj, 'name');

The Object here should be a constructor. Why can the getOwnPropertyDescriptor method be called? Hope you can enlighten me

三叔

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世界只因有你2017-07-05 10:39:23 4 floor

getOwnPropertyDescriptoris a static method

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给我你的怀抱2017-07-05 10:39:23 3 floor

Object is the top-level object of JavaScipr!

In js, there are two concepts: prototype and prototype chain. Instance objects only have prototype chains, while function objects and objects have their own prototypes.
Function objects and objects are the two top-level objects of JavaScipr, whether they are functions Whether instantiated objects, custom objects, array objects, etc., their prototypes are based on these two.

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世界只因有你2017-07-05 10:39:23 2 floor

This object is an object

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学习ing2017-07-05 10:39:23 1 floor

function Template () { // 在用 new 操作符 调用的时候，这就是构造函数 }; Template.staticMethod = function() { // 静态方法 }; Template.prototype.instanceMethod = function() { // 实例方法 };

This should not be difficult to understand
ObjectThe implementation principle is the same

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