<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title> new document </title>
<meta name="generator" content="editplus" />
<meta name="author" content="Gao YiXiang" />
<meta name="email" content="yixianggao@126.com" />
<meta name="keywords" content="javascript dhtml dom" />
<meta name="description" content="I love web development." />
</head>
<body>
<script type="text/javascript">
<!--
function ClassA(sColor)
{
this.name = "dddd";
}
function ClassB(sColor, sName)
{
this.name = sName;
this.color = sColor;
}
ClassB.prototype = new ClassA();
ClassB.prototype.sayName = function () {
alert(this.name);
};
var objB = new ClassB("blue", "Nicholas");
objB.sayName(); // sayName 当然是 ClassB 上的！
delete objB.sayName; // 这样仅删除了当前实例对 ClassB.prototype.sayName 的引用。
//delete ClassB.prototype.sayName; // 这样才真地删除了！
objB.sayName(); // 由于原型方法仍然可用，因此调用 ClassB.prototype.sayName 成功！
//-->
</script>
</body>
</html>
