x
<html><body><h1>JavaScript Objects</h1><h2>The undefined Data Type</h2><p>Objects can be emptied by setting the value to <b>undefined</b>.</p><p id="demo"></p><script>let person = {firstName:"John", lastName:"Doe", age:50, eyeColor:"blue"};person = undefined;document.getElementById("demo").innerHTML = person;</script></body><!-- Mirrored from www.w3schools.com/js/tryit.asp?filename=tryjs_datatypes_undefined_1 by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 21 Dec 2022 17:06:51 GMT --></html>