How javascript embodies inheritance

Because js is an object model of prototype, there are no classes in the strict sense. They are all objects.

To achieve inheritance, you can first

//Create parent object

OldObject=function(){

This.a= "Attribute 1 "

};

//Copy a new object, which already contains the contents of the old object.

new object = new old object()；

//Add something and expand a new object.

NewObject.b = " Attribute 2

NewObject.func=function(){

//New method 1

}

//The new object has the properties of the old object.

alert(new object . a)；

Reward points

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Ext js can realize object-oriented, you can go and see this.