51help TIY
码：
<html> <head> <title>Example</title> </head> <body> <script type="text/javascript"> function ClassA() { } ClassA.prototype.color = "red"; ClassA.prototype.sayColor = function () { alert(this.color); }; function ClassB() { } ClassB.prototype = new ClassA(); ClassB.prototype.name = ""; ClassB.prototype.sayName = function () { alert(this.name); }; var objA = new ClassA(); var objB = new ClassB(); objA.color = "blue"; objB.color = "red"; objB.name = "John"; objA.sayColor(); objB.sayColor(); objB.sayName(); </script> </body> </html>
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