<html>
<head>
<title>Example</title>
</head>
<body>
<script type="text/javascript">
function ClassA(sColor) { this.color = sColor;
}
ClassA.prototype.sayColor = function () { alert(this.color);
};
function ClassB(sColor, sName) { ClassA.call(this, sColor);
this.name = sName;
}
ClassB.prototype = new ClassA();
ClassB.prototype.sayName = function () { alert(this.name);
};
var objA = new ClassA("blue");var objB = new ClassB("red", "John");objA.sayColor();
objB.sayColor();
objB.sayName();
</script>
</body>
</html>