我正在編寫一個拖放腳本，用于拖放帶有“.draggable”類的塊。問題是該塊會定期粘在光標上并且不會脫落。如何編輯此腳本，以便可以用鼠標拖動所有具有“.draggable”類的塊而不會出現此問題？let elements = document.querySelectorAll('.draggable');elements.forEach(function(el) {  let mover = false,    x, y, posx, posy, first = true;  el.onmousedown = function() {    mover = true;  };  el.onmouseup = function() {    mover = false;    first = true;  };  el.parentNode.onmousemove = function(e) {    el.style.cursor = "move";    if (mover) {      if (first) {        x = e.offsetX;        y = e.offsetY;        first = false;      }      posx = e.pageX - x;      posy = e.pageY - y;      el.style.left = posx + 'px';      el.style.top = posy + 'px';    }  }});.draggable {  position: absolute;  z-index: 1;  top: 100px;}<section class="dragscroll">  <div class="draggable">    <textarea></textarea>   </div></section><section class="dragscroll">  <div class="draggable">    <textarea></textarea>  </div></section>