Implementing object inheritance in JavaScript using the Apply method

There are a lot of ways to inherit objects in JavaScript, and in the following articles, let's show you how to do this using the Apply method.

The code is as follows: <script type= "Text/javascript" >//Using the Apply method to implement object inheritance function Parent (username) {this.username = username;  This.sayhello = function () {alert (this.username);  } function child (username, password) {parent.apply (this, new Array (username));    The same as the following//parent.apply (this, [username]);    This.password = password;  This.sayworld = function () {alert (This.password);  } var parent = new Parent ("Zhangsan");    var child = new Child ("Lisi", "123");  Parent.sayhello ();  Child.sayhello ();    Child.sayworld (); </script>