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源代码：
点击运行
<!DOCTYPE html> <html> <head> <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()">Show number of rows in table</button> </body> </html>
运行结果
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