js 将表格的数组存储为二维数组

表格数据：

<table id="tb" width="100%" border="1" cellspacing="3" cellpadding="3" style="text-align: center; display: none;">
		    <caption style="margin-bottom: 15px">商家端功能权限列表</caption>
		        <tr>
		        	<!--角色-->
		        	<th style=" 30px !important;">功能模块显示</th>
		            <th>seller-M</th>        
		            <th>seller-E</th>
		            <th>zone-P</th>
		            <th>city-P</th>
		            <th>seller-H-R</th>
		            <th>advertiser</th>
		        </tr>
		        <!--功能-->
		        <tr>
		        	<th>昨日销售</th>
		            <td>1</td>
		            <td>1</td>
		            <td>1</td>            
		            <td>1</td>
		            <td>0</td>
		            <td>0</td>
		        </tr>
		        <tr>
		        	<th>商家余额</th>
		            <td>1</td>
		            <td>1</td>
		            <td>0</td>
		            <td>0</td>
		            <td>0</td>
		            <td>0</td>
		        </tr>
		        <tr>
		        	<th>待配送</th>
		            <td>1</td>
		            <td>1</td>
		            <td>0</td>
		            <td>0</td>
		            <td>0</td>
		            <td>0</td>
		        </tr>    
		        <tr>
		        	<th>营业状态</th>
		            <td>1</td>
		            <td>1</td>
		            <td>0</td>
		            <td>0</td>
		            <td>0</td>
		            <td>0</td>
		        </tr>
		        <tr>
		        	<th>配送中</th>
		            <td>1</td>
		            <td>1</td>
		            <td>0</td>
		            <td>0</td>
		            <td>0</td>
		            <td>0</td>
		        </tr>
		        <tr>
		        	<th>商城销售</th>
		            <td>1</td>
		            <td>1</td>
		            <td>0</td>
		            <td>0</td>
		            <td>0</td>
		            <td>0</td>
		        </tr>
		        <tr>
		        	<th>收支流水</th>
		            <td>1</td>
		            <td>0</td>
		            <td>1</td>
		            <td>1</td>
		            <td>0</td>
		            <td>1</td>
		        </tr>
		        <tr>
		        	<th>分类管理</th>
		            <td>1</td>
		            <td>1</td>
		            <td>0</td>
		            <td>0</td>
		            <td>0</td>
		            <td>0</td>
		        </tr>
		        <tr>
		        	<th>商品管理</th>
		            <td>1</td>
		            <td>1</td>
		            <td>0</td>
		            <td>0</td>
		            <td>0</td>
		            <td>0</td>
		        </tr>
		        <tr>
		        	<th>发红包</th>
		            <td>1</td>
		            <td>0</td>
		            <td>1</td>
		            <td>1</td>
		            <td>0</td>
		            <td>1</td>
		        </tr>
		        <tr>
		        	<th>优惠券</th>
		            <td>1</td>
		            <td>0</td>
		            <td>0</td>
		            <td>0</td>
		            <td>0</td>
		            <td>0</td>
		        </tr>
		         <tr>
		        	<th>数据报表</th>
		            <td>1</td>
		            <td>1</td>
		            <td>1</td>
		            <td>0</td>
		            <td>0</td>
		            <td>0</td>
		        </tr>
		         <tr>
		        	<th>我的店铺</th>
		            <td>1</td>
		            <td>1</td>
		            <td>0</td>
		            <td>0</td>
		            <td>0</td>
		            <td>0</td>
		        </tr>
		         <tr>
		        	<th>意见反馈</th>
		            <td>1</td>
		            <td>1</td>
		            <td>1</td>
		            <td>1</td>
		            <td>0</td>
		            <td>1</td>
		        </tr>
		        <tr>
		        	<th>联系我们</th>
		            <td>1</td>
		            <td>1</td>
		            <td>1</td>
		            <td>1</td>
		            <td>0</td>
		            <td>1</td>
		        </tr>
		        <tr>
		        	<th>房屋验证</th>
		            <td>0</td>
		            <td>0</td>
		            <td>0</td>
		            <td>0</td>
		            <td>1</td>
		            <td>0</td>
		        </tr>
   		 </table>

　　ｊｓ关键代码

// 	权限列表生成二维数组
		var tr = document.getElementsByTagName('tr');
		var td = document.getElementsByTagName('td');
		ｖａｒ　arr2 = new Array();
		//	初始化二维数组
		for(var i = 0; i < tr.length-1;i++){
			arr2[i] = new Array();
			for(var j = 0; j < td.length/(tr.length-1); j++){
				arr2[i][j] = '';
			}
		}
		
//		console.log(arr2.length);
		//	生成权限列表二维数组
		for (var x = 0; x < tr.length-1; x++) {                            
		    for (var y = 0; y < td.length/(tr.length-1); y++) {            
		        arr2[x][y] = td[x*(td.length/(tr.length-1))+y].innerText;
		        console.log('arr2['+x+']['+y+'] ==  '+ arr2[x][y] )
		    }    
		}
　　　　　　　　　　ａｌｅｒｔ　（ａｒｒ２）