W3School TIY Editor
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<!DOCTYPE html> <html> <head> <style> table, th { border: 1px solid black; } </style> </head> <body> <table border="1"> <tr> <th>单元格 1</th> <th>单元格 2</th> <th>单元格 3</th> <th>单元格 4</th> </tr> </table> <p>单击该按钮可返回表格行中每个单元格的位置。</p> <button onclick="myFunction()">试一试</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 + "单元格 "+(i+1)+" 的索引是："+x[i].cellIndex+"<br>"; } document.getElementById("demo").innerHTML = txt; } </script> </body> </html>