Javascript object introductory example tutorial_js object-oriented

1: Constructor method

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Note:
1 : A Dog object is defined here (in JavaScript, a function is an object, here function Dog(name,weight) is also a constructor), and an object instance dog is created using the new keyword.
2: Among them, _name, _weight, _show, and _sex are the attributes of the instance dog. Instance attributes can be accessed through: instance name.attribute name or instance name ["attribute name"], that is, dog._name=dog["_name"].
3: The attributes in the constructor (here function Dog(name,weight) is also a constructor) will be attached to all instances, for example: var dog1=new Dog(…);dog1 will have _name, _weight, _show attributes, but the _sex attribute is only exclusive to the dog instance, it will not be loaded to other objects. 2: Object creation method:

The object object provides a simple method to create custom objects without defining a constructor.

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Note: Here A cat instance is created using the Object object.
3: Object initializer method

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] Note: 1 , here we have actually implemented static properties and methods, without creating an instance.