js中的构造函数

转载于 2018-07-23 18:31:00 发布 · 57 阅读

CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/themost/p/9356222.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>dog</title>
    <script>
        function Dog(name, breed, weight){
            this.name = name;
            this.breed = breed;
            this.weight = weight;
            this.bark = function(){
                if (this.weight > 25){
                    alert(this.name = " says Woof!");
                } else {
                    alert(this.name = " says Yip!");
                }
            };
        }

        var fido = new Dog("Fido", "Mixed", 38);
        var fluffy = new Dog("Fluffy", "Poodle", 30);
        var spot = new Dog("Spot", "Chihuahua", 10);
        var dogs = [fido, fluffy, spot];

        for (var i = 0; i < dogs.length; i++){
            dogs[i].bark()
        }

        //判断对象是否是构造函数的实例
        if (fido instanceof Dog){
            alert("没错");
        }

        //增删对象的独特属性和方法
        fido.owner = "Bob";
        delete fido.weight;

        fido.trust = function(person){
            return (person === "Bob");
        }


    </script>
</head>
<body>

</body>
</html>