JavaScript 对象 – 原型 描述 原型属性允许您向任何对象（Number、Boolean、String 和 Date 等）添加属性和方法。 注意 − 原型是一个全局属性，几乎在所有对象中都可用。 语法 它的语法如下所示 − object.prototype.name = valueJavaScriptCopy 示例 尝试以下示例。 <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>JavaScriptCopy 输出 Book title is : Perl Book author is : Mohtashim Book price is : 100JavaScriptCopy
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