Редактирование кода:
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<!DOCTYPE html> <html> <head> <style> table, th { border: 1px solid black; } </style> </head> <body> <table border="1"> <tr> <th>Cell 1</th> <th>Cell 2</th> <th>Cell 3</th> <th>Cell 4</th> </tr> </table> <p>Click the button to return the position of each cell in the table row.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementsByTagName("th"); var txt = ""; var i; for (i = 0; i < x.length; i++) { txt = txt + "The index of Cell "+(i+1)+" is: "+x[i].cellIndex+"<br>"; } document.getElementById("demo").innerHTML = txt; } </script> </body> </html>