How to implement the JavaScript member lookup mechanism

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Description

1. When accessing the properties of an object (including methods), first investigate whether the object itself has the property.

2. If not, find the prototype (that is, the prototype prototype object pointed to by _ proto__).

3. If you haven't already found the prototype of the prototype object (the prototype object of Object).

4. And so on until Object is found.

Example

Function Star (uname, age) {this.uname = uname; this.age = age;} Star.prototype.sing = function () {console.log ('I can sing');} Star.prototype.sex = 'female'; / / Object.prototype.sex = 'male'; var ldh = new Star ('Andy Lau', 18) Ldh.sex = 'male'; console.log (ldh.sex); console.log (Object.prototype); console.log (ldh); console.log (Star.prototype); console.log (ldh.toString ()) The above is about the content of this article on "how to realize the JavaScript member search mechanism". I believe we all have a certain understanding. I hope the content shared by the editor will be helpful to you. If you want to know more about the relevant knowledge, please follow the industry information channel.