Prototype属性允许您向任何对象(数字、布尔值、字符串和日期等)添加属性和方法。
注意-prototype是一个全局属性，它几乎可用于所有对象。
prototype - 语法
object.prototype.name=value
prototype - 示例
<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>
运行上面代码输出
Book title is : Perl Book author is : Mohtashim Book price is : 100
