Редактирование кода:
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<!DOCTYPE html> <html> <body> <p>Click the button to loop from 1 to 6, to make HTML headings.</p> <button onclick="myFunction()">Try it</button> <div id="demo"></div> <script> function myFunction() { var x ="", i; for (i=1; i<=6; i++) { x = x + "<h" + i + ">Heading " + i + "</h" + i + ">"; } document.getElementById("demo").innerHTML = x; } </script> </body> </html>