Javascript 如何将计数器的值替换为特定值

我通过更改num rooms input的值来创建一些输入。我想将counter的值替换为span中的特定值。例如，在下面的代码中：

   for (var i =1; i <= $num; i++){
      "<span class=' btn-block room-name'>Room" + i +"</span>"
     }

如果i=1，1替换为跨度中的第一个，结果为：房间优先。 i=2个房间，秒等

   <div class="form-group col-sm-4">
     <input type="number" class="form-control numRoom-btn" placeholder="num rooms" min="1" max="5" />
   </div>
    <div id="room-container">    </div>


    $(document).ready(function () {
        $(".numRoom-btn").change(function () {
            switch (this.value) {
                case "1":
                    clearBefore();
                    addRoom("1");
                    break;
                case "2":
                    clearBefore();
                    addRoom("2");

                    break;
                case "3":
                    clearBefore();
                    addRoom("3");

                    break;
                case "4":
                    clearBefore();
                    addRoom("4");

                    break;
                case "5":
                    clearBefore();
                    addRoom("5");

                    break;
            }
        });
        function addRoom($num) {
            for (var i =1; i <= $num; i++) {

            var $addedElement = $(
                "<div class='numRoom calendar-container'>"+
            "<span class=' btn-block room-name'>Room" + i +"</span>" +
            "<div class='form-group col-sm-4'>"+
                "<span class='btn-block mb5'> Adult(+12)</span>"+
                "<input type='number' class='form-control' placeholder='adult nums' min='1' max='9' />"+
           "</div>"+
            "<div class='form-group col-sm-4'>"+
                "<span class='btn-block mb5'>child(-11)</span>"+
                "<input type='number' class='form-control' placeholder='child nums' min='0' max='6' />"+
            "</div>"+
       "</div>");

            $('#room-container').append($addedElement);
            }
        }

        function clearBefore() {
            $('.numRoom').remove();
        }

    });

更新代码：

这是一个很好的例子 //

---

你可以把它简化一点。您总是不想清空容器，并且您可以从输入中知道房间的数量

<script>

$(function(){
$(".numRoom-btn").on('change', function(e){

  var numInput = $(e.target), $num = parseInt(numInput.val()), roomcontainer = $('#room-container');
  roomcontainer.empty();

  for(let i=0;i<$num;i++){
    addRoom(i+1);
  }

});


function addRoom($num){
  var $addedElement = $(
            "<div class='numRoom calendar-container'>"+
        "<span class=' btn-block room-name'>Room" + $num +"</span>" +
        "<div class='form-group col-sm-4'>"+
            "<span class='btn-block mb5'> Adult(+12)</span>"+
            "<input type='number' class='form-control' placeholder='adult nums' min='1' max='9' />"+
       "</div>"+
        "<div class='form-group col-sm-4'>"+
            "<span class='btn-block mb5'>child(-11)</span>"+
            "<input type='number' class='form-control' placeholder='child nums' min='0' max='6' />"+
        "</div>"+
   "</div>");
  $('#room-container').append($addedElement);
}

  });

请看这里的jsbin

---

我认为您在HTML正文中缺少div，id为room container。添加div即可：PNo我忘记了我已更新代码的副本，请检查。我的问题是我想先创建room而不是room 1，然后创建room second而不是room 2，然后。。。