如何在JavaScript中向对象添加属性和方法?
要向 JavaScript 中的对象添加属性和方法,请使用 prototype 属性。
示例
您可以尝试运行以下代码来了解如何使用原型 -
<html> <head> <title>JavaScript prototype property</title> <script> function book(title, author) { this.title = title; this.author = author; } </script> </head> <body> <script> var myBook = new book("Amit", "Java"); book.prototype.price = null; myBook.price = 500; 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>