What is the use of JavaScript object prototype _ _ proto__

This article is about what JavaScript object prototype__ proto__does. Xiaobian thinks it is quite practical, so share it with everyone for reference. Let's follow Xiaobian and have a look.

__proto__object prototype and prototype object prototype are equivalent.

2. The meaning is to provide a direction for the object lookup mechanism. But as a non-standard attribute, so in actual development, you can't use this attribute, it just points internally to the prototype object prototype.

examples

//Code Description: function People(uname) { this.uname = uname; } //set a public method People.prototype.sing = function() { console.log (') is humming and singing... '); } let zs = new People(''); //There is no sing method on the instance object //but access this method through instance objects // zs.sing(); // console.log(zs.__ proto__ == People.prototype); // true console.log(zs); Thank you for reading! About "JavaScript object prototype__ proto__what's the use" This article is shared here, I hope the above content can be of some help to everyone, so that everyone can learn more knowledge, if you think the article is good, you can share it to let more people see it!