Inheritance

[whisher]

Ciao.
Seguendo questo tutorial ho trovato questo snippet:

<script language="JavaScript" type="text/JavaScript">
function DivA(){
    // define object properties
    this.div=document.createElement('div');
    this.width='400px';
    this.height='300px';
    this.position='absolute';
    this.top='10px';
    this.left='10px';
    this.padding='5px';
    this.border='1px solid #000';
    this.backgroundColor='#f00';
    // define 'display()' method
    this.display=function(){
        this.div.style.width=this.width;
        this.div.style.height=this.height;
        this.div.style.position=this.position;
        this.div.style.top=this.top;
        this.div.style.left=this.left;
        this.div.style.padding=this.padding;
        this.div.style.border=this.border;
        this.div.style.background=this.backgroundColor;
        document.getElementsByTagName('body')[0].appendChild(this.div);
    }
}  

// derive a child object from DivA object
function DivB(){
    // define object properties and override parent properties
    this.width='500px';
    this.height='200px';
    this.position='absolute';
    this.top='20px';
    this.left='20px';
    this.padding='10px';
    this.border='20px solid #0f0';
    this.backgroundColor='#00f';
}
DivB.prototype=new DivA();
window.onload=function(){
var div2=new DivB();
div2.display();

}
</script> 

C'è un modo di ottenere la stessa cosa
non utilizzando prototype.

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