js给原型增加新属性和方法

时间：2022-07-08 16:49:59
<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Dog</title>

    <script>

        //给原型增加新属性和方法

        function Dog(name, breed, weight){

            this.name = name;

            this.breed = breed;

            this.weight = weight;

        }

        Dog.prototype.species = "Canine";

        Dog.prototype.bark = function(){

            if (this.weight > 25){

                console.log(this.name + " Woof");

            }

        };

        var fido = new Dog("fido", "mixed", 38);

        fido.bark();

        //给原型添加方法后所有的继承者都拥有该方法,属性也是如此

        var barnaby = new Dog("Barnaby", "Basset Hound", 55);

        Dog.prototype.sit = function(){

            console.log(this.name + " is now sitting");

        };

        barnaby.sit();

    </script>

</head>

<body>

</body>

</html>

相关文章