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<!DOCTYPE html> <html> <body> <h1>Demo: JavaScript Object</h1> <p id="p1"></p> <p id="p2"></p> <script> function changeFirstName(per) { per.firstName = "Steve"; } var person = { firstName : "Bill" }; document.getElementById("p1").textContent = person.firstName; changeFirstName(person) document.getElementById("p2").textContent = person.firstName; </script> </body> </html>
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