嵌套<ul>结构体。 仅循环通过顶层<li>元素</li></ul>

Question

I have the following HTML structure:

<ul>

  <li></li> <!-- First element top-level element -->

  <li></li> <!-- Second element top-level element -->

  <ul>
    <li></li>
    <li></li>
  </ul>

  <li></li> <!-- Third element top-level element -->

  <ul>
    <li></li>
    <li></li>
  </ul>

</ul>

How can I select and loop only through the top-level <li> elements of the first ul structure? (should do 3 loops) . I tried the following, but that loops through all <li> elements (7 loops) .

var li_elements = cat_tree
  .getElementsByTagName("ul")[0]
  .getElementsByTagName("li");

for (let element of li_elements) {
  // Do Some Awesome Code Here
}

Answer 1

Use a child selector instead of getElementByTagName.

I don't know the parent structure, but give this a try.

var li_elements = cat_tree.querySelectorAll("ul:first-child > li");

Answer 2

with querySelectorAll you get a nodelist to apply foreach() method like a array