<u>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
</u>

aA=document.getElementsByTagName('li');

Take out the li element
Then bind the click event

for(var i = 0; i < aA.length; i++) {
    aA[i].onclick = function () {

Now I click on the second li element, but I want to find out the adjacent sibling elements of the second li element

Then I used .previousSibling; but what I found was #text, not the first li element.
When I deleted all the spaces in ul, what I found was the first element. element

Then now I want to find the previous sibling element of the li element without deleting spaces. Without using JQ

How to implement this function