检查div是否是另一个的后代

问题描述：

了解最佳方法如果元素是另一个的后代，还有另一个问题，这个问题非常类似于它的jquery。

Best way to find out if element is a descendant of another there is another question, very similiar to this one but its jquery.

所以，我该如何在js中做到这一点？
我有div，a，b，c，d按此顺序嵌套。
也不确定是否重要，还有另一个a，b，c ......和另一个。它不仅仅是一个单一元素。有很多相同的id / class。

so, how do I do it in js ? I have divs a, b, c, d nested in this order. also, not sure if matters, there is another a, b, c... and another. its not just a single element. there is many by same id/class.

所以我想知道d是否有父（无论嵌套有多深，只要有一些父级在它的ok）上叫a。

so I want to see if d has a parent(no matter how deep it is nested, as long as there is some parent on top its ok) called a.

编辑：
也有，我有这个想法，我可以检查a的子节点，看看是否d是其中之一，但无法实现它。如果有人可以使它工作，那就太棒了。

edit: also, I had this idea that I could check childnodes of "a" and see if "d" is one of them, but couldnt implement it. if someone can get it working, itd be awesome.

答

// x is the element we are checking
while (x = x.parentNode) { 
    if (x.id == "a") console.log("FOUND");
}

检查div是否是另一个的后代

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