The value property represents the VALUE attribute of the HTML tag used to create the radio button.
<html> <head> <title> Example of the radio value property</title> </head> <body> <form name="form1"> <input type="radio" name=button1 value=1>Box 1 <br><br> <input type="button" value="Get Button Value" onClick='alert("The button value is: " + document.form1.button1.value)'> </form> </body> </html>