What are the functions of new operator?
The function is to create objects, inherit properties and methods, set the prototype chain, and return new objects. Detailed introduction: 1. Create an object: The new operator can create an empty object and bind the object to the constructor as the this keyword. This newly created object can access the properties and methods in the constructor; 2. Inheritance Properties and methods: Objects created through the new operator will inherit the properties and methods on the prototype object of the constructor, which means that newly created objects can share the properties and methods on the prototype object of the constructor; 3. Set up the prototype chain, etc.
Operating system for this tutorial: Windows 10 system, Dell G3 computer.
The new operator has the following functions in JavaScript:
1. Create an object: The new operator can create an empty object and bind the object to the constructor as the this keyword. in function. This newly created object can access the properties and methods in the constructor.
2. Inherit properties and methods: Objects created through the new operator will inherit the properties and methods on the prototype object of the constructor. This means that newly created objects can share the properties and methods on the constructor prototype object.
3. Set up the prototype chain: The object created through the new operator will automatically establish a prototype chain relationship with the prototype object of the constructor. In this way, when accessing a property or method of an object, if the object itself is not defined, it will be looked up along the prototype chain.
4. Return a new object: The new operator will return a newly created object. If no other object is explicitly returned in the constructor, the new operator returns the new object.
It should be noted that the new operator can only be used for constructors, it cannot be used for ordinary functions or arrow functions. When using the new operator, the constructor is used as a special initialization method for creating objects and setting the initial state of the object.
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