如何保存动态创建的复选框的更改状态

问题是，在你重建的每个模式调用中，它都.html()一个全新的HTML字符串。
而是创建一个内存中的复选框元素并附加该元素。

js小提琴演示

var $cbx = $("<input>", {
  type: "checkbox",
  value: "",
  class: "form-control checkboxpicker",
  checked: true,
  name: ""
});
$('button[data-target="#myModal"]').on('click', function(){
  $('#app').html('<div class="checkboxContainer">Checkbox: </div>');
  $('.checkboxContainer').append($cbx); // Append our in-memory checkbox!
  $cbx.checkboxpicker();
});

回顾一下，无论$cbx checked状态发生什么，都将永远在$cbx内部记住。重新附加该项 - 您将始终获得其上次（当前）状态。

使用$('.checkboxpicker').prop('checked',active);并初始化active，最初false/true。

var active = false;
$('button[data-target="#myModal"]').on('click', function() {
  $('#app').html('<div class="checkboxContainer">Checkbox: </div>');
  $('.checkboxContainer').append(
    '<input class="checkboxpicker" name="" value="" type="checkbox" class="form-control">'
  );
  $('.checkboxpicker').prop('checked', active);
  $('.checkboxpicker').checkboxpicker(false);
});
$(document).on('change', '.checkboxpicker', function() {
  active = this.checked;
  console.log(active);
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-checkbox/1.4.0/bootstrap-checkbox.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap-theme.min.css" rel="stylesheet" />
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet" />
<!-- Button trigger modal -->
<button type="button" class="btn btn-primary btn-lg" data-toggle="modal" data-target="#myModal">
  Launch demo modal
</button>
<!-- Modal -->
<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel">
  <div class="modal-dialog" role="document">
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span>
        </button>
        <h4 class="modal-title" id="myModalLabel">Modal title</h4>
      </div>
      <div class="modal-body">
        <div id="app">
        </div>
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary">Save changes</button>
      </div>
    </div>
  </div>
</div>

小提琴演示