AI 编程工具xxxxxxxxxx<html><head><meta charset="utf-8"><title>高手教程(study.p2hp.com)</title><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>单元格 1</td> <td>单元格 2</td></tr><tr> <td>单元格 3</td> <td>单元格 4</td></tr></table><br><input type="button" onclick="cell()" value="第一个单元格"></body></html>