W3School TIY Editor
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<!DOCTYPE html> <html> <head> <style> table, td { border: 1px solid black; } </style> </head> <body> <p>单击该按钮可获取表中 tbody 元素的数量。</p> <table id="myTable"> <tbody> <tr> <td>单元格 1</td> <td>单元格 2</td> </tr> </tbody> <tbody> <tr> <td>单元格 3</td> <td>单元格 4</td> </tr> </tbody> </table> <br> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myTable").tBodies.length; document.getElementById("demo").innerHTML = "在表格中找到 " + x + " 个 tbody 元素。"; } </script> </body> </html>