dataTables添加序号和行选中框

 <table id="mytable" class="table table-striped table-bordered" width="100%">
     <thead>
         <tr>
                 <th>序号</th>
                <th>
                     <input type="checkbox" class="checkall" />
                 </th>
             </tr>
     </thead>
    <tbody></tbody>
 </table>

 $(document).ready(function(){
     var table = $("#mytable").DataTable({
             "processing":true,
              "ajax": {
                  "url": "user/getTableDatas",
              },
              "columns": [
                 {"data":"index",//序号
            "render":function(data,type,row,meta){
             var startIndex = meta.settings._iDisplayStart;
             return startIndex+meta.row+1;
         }},
                 {
                     "sClass": "text-center",
                     "data": "id",//行单选框
                     "render": function (data, type, full, meta) {
                       return '<input id="checkchild" type="checkbox"  class="checkchild"  value="' + data + '" />';
                     },
                     "bSortable": false
                 }
              ],
              //行被创建时调用
              "createdRow":function(row,data,dataIndex){

              }
     });
     //复选框全选
     $(".checkall").click(function () {
           var check = $(this).prop("checked");
           $(".checkchild").prop("checked", check);
           checkButton();
     });
     //行内的选择框选中
     $(document).on("click","#checkchild",function(){
         var check = $(this).prop("checked");
         if(check && check==true){
             $(this).prop("checked",false);
         }else{
             $(this).prop("checked",true);
         }
         checkButton();
     });

     //选中行事件
     $("#mytable tbody").on("click","tr",function(){
         var check = $(this).find(".checkchild").prop("checked");
         if(check && check==true){
             $(this).find('.checkchild').prop("checked",false);
         }else{
             $(this).find('.checkchild').prop("checked",true);
         }
         checkButton();

     });