这里可以用class属性组合。我们基于类创建事件，并为当前元素选择父元素，该元素仅包含该特定元素。
所以我们可以对当前元素中的元素进行任何操作。

尝试下面的片段

$(function () {
    $('.close').on('click', function () {
        $(this).parent('.myCustomElm').find('.danceforme').hide();
    });
    $('.open').on('click', function () {
        $(this).parent('.myCustomElm').find('.danceforme').show();
    });
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="myCustomElm">
    <button class="close">Stop Dancing</button>
    <button class="open">Dance for me</button>
    <div class="danceforme">I am dancing 1</div>
</div>
<div class="myCustomElm">
    <button class="close">Stop Dancing</button>
    <button class="open">Dance for me</button>
    <div class="danceforme">I am dancing 2 </div>
</div>
<div class="myCustomElm">
    <button class="close">Stop Dancing</button>
    <button class="open">Dance for me</button>
    <div class="danceforme">I am dancing 2 </div>
</div>