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Javascript 中的 prototype函数

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

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