What are the constructor properties in js

Today, I will talk to you about what the constructor properties in js are, which may not be well understood by many people. In order to make you understand better, the editor has summarized the following contents for you. I hope you can get something according to this article.

1. In the object, you can set some strange properties, _ num, called constructor properties. In general, this property is not intended to be accessed directly through external (obj._num).

We want to control the access logic of this property, and obj.num can access it and then change its logic.

2. Constructor properties can override the get and set methods of custom properties.

Example

Var obj= {_ num:0} obj.num can be accessed and returns a number: 0Object.defineProperty (obj,'num', {/ / when we do not set this property, the default is an implicit call, if set Will call the method you set / / override the set and get properties of the custom property set (num) {thsi._num=num}, / / call get () {return 'number:' + this._num} / / call}) console.log (obj.num) when the value of the num is set. Obj.num=5;console.log (obj.num); after reading the above, do you have any further understanding of what constructor properties are in js? If you want to know more knowledge or related content, please follow the industry information channel, thank you for your support.