问如何将复选框状态保留在带复选框的google可视化表中

EN

  var checkboxes = document.querySelectorAll("#table_div input[type=checkbox");
  var checkboxesState = {};
  for (var i = 0; i < checkboxes.length; i++) {
    checkboxes[i].addEventListener("change", function(){
      checkboxesState[this.getAttribute("id")] = this.checked;
    });
  }

    google.visualization.events.addListener(table, 'sort', function(ev) {
       //Needed, since the whole table DOM will change
       checkboxes = document.querySelectorAll("#table_div input[type=checkbox");
          for (var i = 0; i < checkboxes.length; i++) {
            if (checkboxesState[checkboxes[i].getAttribute("id")]){
              checkboxes[i].checked = checkboxesState[checkboxes[i].getAttribute("id")];
            }
          }
    });