将html table中的数据封装成json格式数据
    var tab=document.getElementById("table1");
    var rows=tab.rows;
    //alert(rows.length);
    var txt = "[";
    for(var i=2;i<rows.length;i++)
    {
    var r = "[";   
        for(var j=0;j<rows[i].cells.length;j++)
        {
            // alert("第"+(i+1)+"行，第"+(j+1)+"列的值是:"+rows[i].cells[j].innerHTML);
            r += "\"" + rows[i].cells[j].innerHTML+"\",";
        }
    r = r.substring(0, r.length - 1);
    r += "],";
    txt += r;
    }
    txt = txt.substring(0, txt.length - 1);
    txt += "]";
    // alert(txt);


     JSONArray jsonarray = JSONArray.fromObject(txt);
     for(int i=0;i<jsonarray.size();i++){
         log.debug(jsonarray.get(i));
         JSONArray jsoncol = JSONArray.fromObject(jsonarray.get(i));
         for(int j=0;j<jsoncol.size();j++){
             log.debug(jsoncol.get(j));
         }
    }