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JavaScript中的原型prototype屬性使用詳解，javascriptprototype
prototype屬性可以將屬性和方法添加到任何對象(Number, Boolean, String 和Date等)。
註：原型(Prototype)是一個全域的屬性，它可以使用在幾乎所有的對象。
文法
object.prototype.name = value
執行個體:
這裡有一個例子展示了如何使用原型(prototype)屬性的屬性添加到對象：
<html><head><title>User-defined objects</title><script type="text/javascript">function book(title, author){ this.title = title; this.author = author;}</script></head><body><script type="text/javascript"> var myBook = new book("Perl", "Mohtashim"); book.prototype.price = null; myBook.price = 100; document.write("Book title is : " + myBook.title + "<br>"); document.write("Book author is : " + myBook.author + "<br>"); document.write("Book price is : " + myBook.price + "<br>");</script></body></html>
這將產生以下結果：
Book title is : PerlBook author is : MohtashimBook price is : 100
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