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<!DOCTYPE html> <html> <body> <p>Click the button to loop through the properties of an object.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var person = {fname:"John", lname:"Doe", age:25}; var text = ""; var x; for (x in person) { text += person[x] + " "; } document.getElementById("demo").innerHTML = text; } </script> </body> </html>