javascript - 有没有办法检查一个类是否在另一个类中？

Question

假设我想检查 square[6] 是否在 row[2] 中。我该怎么做？我想知道两个正方形是否在同一行内。

<!--Row 1-->
<div class = "row">
    <!--Square 1-->
    <div class = "square" onclick="clicked(0,0)"></div>
    <!--Square 2-->
    <div class = "square" onclick="clicked(1,0)"></div>
    <!--Square 3-->
    <div class = "square" onclick="clicked(2,0)"></div>
    <!--Square 4-->
    <div class = "square" onclick="clicked(3,0)"></div>
</div>
<!--Row 2-->
<div class = "row">
    <!--Square 5-->
    <div class = "square" onclick="clicked(4,1)"></div>
    <!--Square 6-->
    <div class = "square" onclick="clicked(5,1)"></div>
    <!--Square 7-->
    <div class = "square" onclick="clicked(6,1)"></div>
    <!--Square 8-->
    <div class = "square" onclick="clicked(7,1)"></div>
</div>

Answer 1

const byClass = document.getElementsByClassName.bind(document);

if( byClass("row")[1] === byClass("square")[5].parentElement )
  alert("square[6] is in row[1]");

只是检查一个是否是另一个的父级