javascript - 如何从 HTML 中提取 "parent with two child' s"模式

Question

我需要从 HTML 中提取所有有两个 child 的 parent

示例 1

<parent>
 <child>
  <tag></tag>
 </child>
 <child></child>
</parent>

示例 2

<parent>
 <parent_and_child>
  <tag></tag>
  <tag></tag>
 </parent_and_child>
 <child></child>
</parent>

示例 1 应输出 <parent>示例 2 应输出 <parent>和<parent_and_child>

Answer 1

jQuery(function($){
        $('.common').each(function(){
          //If tag has 2 children get the name of node
            if ($(this).children().length == 2 ) {
               console.log($(this)[0].nodeName);

            }
        });
})

		

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.0/jquery.min.js"></script>

<!-- Add the common class to each tag -->
<parent class = "common">
 <parent_and_child class = "common">
  <tag class = "common"></tag>
  <tag class = "common"></tag>
 </parent_and_child>
 <child class = "common"></child>
</parent>