找到最近的具有特定类的祖先元素 - Find the closest ancestor element that has a specific class

问题：

How can I find an element's ancestor that is closest up the tree that has a particular class, in pure JavaScript ?如何在纯 JavaScript 中找到最靠近具有特定类的树的元素的祖先？ For example, in a tree like so:例如，在这样的树中：

<div class="far ancestor">
    <div class="near ancestor">
        <p>Where am I?</p>
    </div>
</div>

Then I want div.near.ancestor if I try this on the p and search for ancestor .然后我想要div.near.ancestor如果我在p上尝试这个并搜索ancestor 。

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解决方案：

参考一： https://stackoom.com/question/1UoKv
参考二： Find the closest ancestor element that has a specific class