如何使用JavaScript获取一个表格的行数和列数？其实很简单，假设存在如下表格：

<table width="100%" border="1" cellspacing="0" cellpadding="0" id="example_table"> 
    <tr> 
        <td>&nbsp;</td> 
        <td>&nbsp;</td> 
        <td>&nbsp;</td> 
        <td>&nbsp;</td> 
        <td>&nbsp;</td> 
    </tr> 
    <tr> 
        <td>&nbsp;</td> 
        <td>&nbsp;</td> 
        <td>&nbsp;</td> 
        <td>&nbsp;</td> 
        <td>&nbsp;</td> 
    </tr> 
    <tr> 
        <td>&nbsp;</td> 
        <td>&nbsp;</td> 
        <td>&nbsp;</td> 
        <td>&nbsp;</td> 
        <td>&nbsp;</td> 
    </tr> 
</table> 

则获取该表格的行数和列数可分别如下代码：

//表格行数 
var rows = document.getElementById("example_table").rows.length; 
 
//表格列数 
var cells = document.getElementById("example_table").rows.item(0).cells.length;