Javascript输出表格

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<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> 
<script language="JavaScript" type="text/javascript"> 
 
        function addnew() 
        { 
              c   =   prompt("请输入内容！","");//列   
              if   (c   ==   null)    
              {    
                  return false;  
              }    
              else   if   (c.replace(/^s+|s+$/g,"")   ==   "")    
              { 
                alert("输入内容为空！");    
                 return false; 
              } 
              //alert(c); 
        } 
        addnew(); 
 
        var r; //定义行 
 
        setrc(3,c);  //调用指定行列输出表格,根据内容数组维来指定几行几列 
 
        function setrc(r,c){   //指定行列输出表格函数 
        document.write("<table border=1 >") 
        for(i=1;i<=r;i++) 
        { 
            document.write("<tr>")        
            for(j=1;j<=c;j++) 
                document.write("<td>"+Math.pow(j,i))  //输出数组 
            document.write("</tr>") 
        } 
        document.write("</table>") 
 
} 
//setrc(3,2); 
</script> 
</body> 
 
 
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</head> 
 
<body> 
</body> 
</html>
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