AI 编程工具xxxxxxxxxx<html><head><meta charset="utf-8"><title>高手教程(study.p2hp.com)</title><script>function displayResult(){ alert(document.getElementById("myTable").rows.length);}</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><button type="button" onclick="displayResult()">显示表的行数</button></body></html>