在這里，為什么切換方法不起作用？我正在嘗試運行自定義函數并在純 JavaScript 中循環此函數。我期待 Jquery 切換。單擊標題時，然后添加dsplyBlck到它的子文章，dsplyBlck當重新單擊標題時，將其刪除到它的子文章。window.onload = function(){  var hdr = document.querySelectorAll('header');  for(var i=0; i<hdr.length; i++){    hdr[i].onclick = function(){      var elm = this.closest('section').querySelector('article');      tgglArticle(elm,this);    }  }}function tgglArticle(elm, hdr){  elm.classList.add('dsplyBlck');  hdr.addEventListener('click',function(){    console.log('Here message is displaying, but remove class not working');    elm.classList.remove('dsplyBlck');    tgglArticle(elm,hdr);  })}.dsplyNne{  display:none;}.crsr{  cursor:pointer;}.dsplyBlck{  display:block;}<section>  <header class='crsr'>    Header  </header>  <article class='dsplyNne'>    Details  </article></section><section>  <header class='crsr'>    Header  </header>  <article class='dsplyNne'>    Details  </article></section>