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How to add properties and methods to objects in JavaScript?

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Release： 2023-08-27 21:29:10
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How to add properties and methods to objects in JavaScript?

To add properties and methods to objects in JavaScript, use the prototype attribute.

Example

You can try running the following code to understand how to use the prototype -

<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>
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Related labels：
Add attributes: Objects in JavaScript can add attributes through dot syntax or square bracket syntax. Properties added. Add method: in javascript You can add methods to an object by adding functions to it. Method added. Object manipulation: in javascript You can use different methods to add, delete, modify, and query objects. Object operations.
source：tutorialspoint.com
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