<!DOCTYPE html><html><head><script>function cell(){var x=document.getElementById("myTable").rows[0].cells;alert(x[0].innerHTML);}</script></head><body><table id="myTable" border="1"><tr><td>cell 1</td><td>cell 2</td></tr><tr><td>cell 3</td><td>cell 4</td></tr></table><br><input type="button" onclick="cell()"value="Alert first cell"></body></html>希望本文所述对大家的javascript程序设计有所帮助。