How to choose and switch like this?

<ul class="feature-nav feature-nav-scroll">
    <li class="feature-nav-item"><a href="-sharp" class="nav-btn nav-btn-active">Function</a></li>
    <li class="feature-nav-item"><a href="-sharp" class="nav-btn">Configuration</a></li>
    <li class="feature-nav-item"><a href="-sharp" class="nav-btn">Download</a></li>
    <li class="feature-nav-item"><a href="-sharp" class="nav-btn">Compatible Device</a></li>
</ul>
$(".nav-btn").on("click",function(){
    $(this).addClass("nav-btn-active").removeClass("nav-btn-active");
})

doesn"t work?

Jquery
Mar.09,2021

choose father, then father and brother, and then removeClass ('nav-btn-active'), son of father and brother; 

$(this).addClass('nav-btn-active').parent().siblings().children().removeClass('nav-btn-active');

or first go to the father's father to find the node with 'nav-btn-active'' below removeClass
and then $(this). AddClass ('nav-btn-active')

The simpler way to write

is: 

  
 $('.nav-btn-active'). RemoveClass (' nav-btn-active'); 
 $(this) .addClass ('nav-btn-active');

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b3a007-2c1e6.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3a007-2c1e6.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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