如何在javascript

Question

我正在使用javascript克隆div，并且如果单击添加更多按钮并且div被克隆，我想使关闭按钮可见。原始父项必须隐藏“关闭”按钮，而克隆项必须可见。

我尝试了以下代码：

  var i=0;
    var original = document.getElementById('clone_div');
    function duplicate(){
        var clone = original.cloneNode(true);
        clone.id="clone_div" + ++i;
        original.parentNode.appendChild(clone);
        var clonned_close = 
        document.getElementById(clone.id).getElementsByClassName('close');
        clonned_close.classList.remove('hide');
    }

<div>
        <h5 class="p-1 border-bottom"><strong>Add Members:</strong></h5>
        <div id="clone_div">    
            <h5 class="pt-2 pb-1">Member<span class="ml-auto close hide" 
             style="cursor: pointer;">x</span></h5>
            <div class="row">
                <div class="col-lg-4 col-md-6 col-sm-12">
                    <div class="form-group">
                        <label>Name <span class="text-danger">*</span> 
                        </label>
                        <input type="text" name="mem_name[]" class="form- 
                        control w-100">
                    </div>
                </div>
                <div class="col-lg-4 col-md-6 col-sm-12">
                    <div class="form-group">
                        <label>Designation <span class="text-danger">* 
                        </span></label>
                        <input type="text" name="designation[]" 
                        class="form-control w-100">
                    </div>
                </div>
                <div class="col-lg-4 col-md-6 col-sm-12">
                    <div class="form-group">
                        <label>image Upload <span class="text-danger">* 
                        </span></label>
                         <input type="file" name="image[]" class="form- 
                         control w-100">
                    </div>
                </div>
            </div>
        </div>
    </div>
     <a href="#!" title="" class="btn btn-sm btn-green" 
   onclick="duplicate()"><i class="fas fa-plus pr-3"></i>Add more</a>

控制台中的错误是：       未被捕获的TypeError：无法读取未定义的属性“删除”