Using the Apply method to implement object inheritance _javascript techniques in JavaScript

Copy Code code 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));
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>