Checking if an object property exists in JavaScript

To check the existence of an object property in JavaScript do the following:
1.First rightclick on the HTML page that has the JavaScript code. Go to ‘Open With’ to see the list of compatible programs, and select ‘Notepad’
2.Press Ctrl +F , and the Find dialog window will display. Type in ‘<script’ and then press Enter and then scroll down to the JavaScript text.
3.Using the If statement you have to check for undefined and null values for an element. if(typeof(myv) !== 'undefined' && va != null) {
alert("The Object is defined");
}
4.Press Ctrl +S to save your changes.