The object in JS

An object belongs to a composite data type that can hold properties of several different data types in an object.

Classification:

1. Built-in objects: objects defined by the ES standard can be used in the implementation of any ES.

2. Host object: The object provided by JS's running environment, which is mainly referred to by the browser.

3. Custom objects: Objects created by developers themselves.

object's Operation:

1. Create object: The function called with the New keyword is the constructor constructor, the constructor is the function that is used to create the object, and when you check an object with TypeOf, object is returned.

2. Add property to object: Syntax: Object. property name = attribute value;

3. Read the object's properties: Syntax: Object. Property name

(If you read an attribute that is not in the object, it will return udefined)

4. Modify the object's property value: Syntax: Object. property name = attribute value (new value);

5. Delete the object's properties: syntax: Delete object. property name;

The object in JS