Prototype inheritance..

<script>
        // Inherit ： for example , Fengjianweiyou 1000 ten thousand , A hundred years later , His son inherited 10 Yuan 
        // Be careful ： Inheritance is to inherit the same attributes （ Something in common ）, Inheritance between classes 
        function Dog(name, age){
    
            this.name = name
            this.age = age
        }
        Dog.prototype.rg = function(){
    
            console.log(' Like to wander around !')
        }
        function Tugou(name, age){
    
            this.name = name
            this.age = age
        }
        // Inheritance is required 
        // Prototype inheritance , It is conducive to the inheritance of the search rules of the prototype chain 
        //Tugou.prototype  It's an object , Can you re assign values to objects , Sure 
        Tugou.prototype = Dog.prototype
        // stay Tugou A method is set on the prototype 
        Tugou.prototype.eat = function(){
    
            console.log(' Like to eat all kinds of things ')
        }

        console.log(Dog.prototype)

        //Tugou.prototype.constructor = Tugou
        let t1 = new Tugou(' Little black ', 2)
        t1.rg()
        // let t2 = new Dog(' Xiaohong ',3)
        
         console.log(Tugou.prototype)
         console.log(t1.__proto__)
    </script>

// Inherit ： for example , Fengjianweiyou 1000 ten thousand , A hundred years later , His son inherited 10 Yuan 
        // Be careful ： Inheritance is to inherit the same attributes （ Something in common ）, Inheritance between classes 
        function Dog(name, age) {
    
            // The code in the constructor body can also inherit 
            this.name = name
            this.age = age
        }
        Dog.prototype.rg = function () {
    
            console.log(' Like to wander around !')
        }
        function Tugou(sex) {
    
            // this.name = name
            // this.age = age
            this.sex = sex
        }
        // Inheritance is required 
        // Prototype inheritance , It is conducive to the inheritance of the search rules of the prototype chain 
        //Tugou.prototype  It's an object , Can you re assign values to objects , Sure 
        //Tugou The prototype object of is equal to Dog Instantiation object of constructor 
        Tugou.prototype = new Dog(' Little black ', 2)
        Tugou.prototype.eat = function(){
    
            console.log(' You know how to eat ')
        }
        //Tugou.prototype.constructor = Tugou
        let t1 = new Tugou(' Male ')
        t1.rg()
        // console.log(Dog.prototype)
        t1.eat()
        console.log(t1)
        console.log(t1.name)
        

        // console.log(t1.__proto__)