How javascript uses new to create objects

This article introduces the knowledge of "how javascript uses new to create objects". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Description

1. Create a new empty object in memory.

2. Point the this in the builder to the new object.

3. Execute the code in the structure function, add properties and methods to the new object, and assign it to the transmission parameters.

4. Return the new object.

Example

Function create () {/ / 1. Create a new empty object var obj = new Object (); / / 2. Take the first argument, which is the constructor we want to pass in, and arguments will be stripped of the first parameter Con = [] .shift.call (arguments); / / 3. Point the obj prototype to the constructor so that obj can access the property obj.__proto__ = Con.prototype; / / 4 in the constructor prototype. Using apply, change the point of the constructor this to the newly created object so that obj can access the property var ret = Con.apply (obj, arguments) in the constructor; / / 5. Give priority to returning the object returned by the constructor return ret instanceof Object? Ret: obj;} "how javascript creates objects using new" ends here. Thank you for reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!