对象的创建、使用及向String对象添加方法（prototype的使用）

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prototype 属性使您有能力向对象添加属性和方法。

语法

object.prototype.name=value

<html><head><script language="javascript" type="text/javascript">//对象的定义，使用（名片示例）function Card(name, address, work, home){this.name = name;this.address = address;this.work = work;this.home = home;this.show = ShowCard;}function ShowCard(){l1 = "name:" + this.name + ".<br/>";l2 = "address" + this.address + ".<br/>";l3 = "work" + this.work + ".<br/>";l4 = "home" + this.home + ".<br/>";document.write(l1,l2,l3,l4);}var tom = new Card("tom","河口","程序员","北京");tom.show();//向String对象添加一个heading方法。将字符串显示为标题，然后用这个方法显示3个标题function addhead(level){html = "H" + level;text = this.toString();a = "<" + html + ">";b = "<" + html + "/>";return a + text + b;}String.prototype.heading = addhead;document.write("this is h1".heading(1)+"</br>");document.write("this is a h3".heading(3)+"</br>");document.write("this is a h5".heading(5)+"</br>")</script></head></html>

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