Adding and Deleting Properties and Methods

 
<!DOCTYPE HTML>
<html>
<head>
<title>Example</title>
</head>
<body>
  <script type="text/javascript">
    var myData = {
      name : "Java",
      weather : "Good",
    };
    myData.dayOfWeek = "Monday";
    document.writeln(myData.name);
    document.writeln(myData.weather);
    document.writeln(myData.dayOfWeek);
    
  </script>
</body>
</html>
Click to view the demo
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    Essential Types  

Object:
  1. The Object Type
  2. Enumerating an Object's Properties
  3. Adding and Deleting Properties and Methods
  4. Add new methods to an object
  5. Delete a property or method from an object
  6. Determine If an Object Has a Property
  7. Performing Equality and Identity Tests on Objects