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<!DOCTYPE html>
<html>
<body>
​
<p>JavaScript objects are mutable.</p>
<p>Any changes to a copy of an object will also change the original.</p>
​
<p id="demo"></p>
​
<script>
var person = {firstName:"John", lastName:"Doe", age:50, eyeColor:"blue"}
​
var x = person;
x.age = 10;
​
document.getElementById("demo").innerHTML =
person.firstName + " is " + person.age + " years old.";
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/js/tryit.asp?filename=tryjs_object_mutable by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 02:28:15 GMT -->
</html>
​
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