Summary of five inheritance methods based on constructor

1. Use call or apply to bind the constructor

()

2. Use prototype attribute

 = new Animal();

 = Cat;

var cat1 = new Cat("Big Hair","yellow");

alert(); // animal

3. Directly integrate prototype attributes

function Animal(){ }

 = "animal";

 

 = ;

 = Cat;

var cat1 = new Cat("Big Hair","yellow");

alert(); // animal

4. Use empty objects as intermediary

var F = function(){};

 = ;

 = new F();

  = Cat;

Encapsulate the above method into a function，Easy to use：

function extend(Child, Parent) {

var F = function(){};

 = ;

 = new F();

 = Child;

 = ;

}

5. Copy Inheritance

function extend2(Child, Parent) {

var p = ;

　 var c = ;

for (var i in p) {

c[i] = p[i];

}

 = p;

}

The function of this function is to copy the properties in the parent object's prototype object to the Child object's prototype object one by one.

The above summary of the five inheritance methods based on constructors is all the content I share with you. I hope you can give you a reference and I hope you can support me more.