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     <table id= "selected_user_table"  width= "100%"  >
         <thead>
             <tr><th  class = "center"  colspan= "2"   style= "background-color:#F2F2F2;height:20px;" >已选择</th></tr>
         </thead>
         <tbody id= "select_user_td" >
         </tbody>
     </table>
<script>
//添加一行
     var trHTML =  "<tr id='tr_" +row.id+ "'><td width='10%'><input  name='selected_user' type='checkbox'/></td></tr>"
     if (isOder){
         $( "#select_user_td tr:eq(" +num+ ")" ).after(trHTML); 
     } else {
         $( "#select_user_td" ).append(trHTML);
     }
     
     //删除一行
     $( "#tr_" +row.id).remove(); //选中tr，然后删除。
</script>