javascript - 未捕获的类型错误：无法读取 null javascript 的属性“parentNode”

Question

这段代码应该使一个元素在被放到另一个元素上时从列表中消失（称为 cookiemonster）

addEvent(cookiemonster, 'drop', function (e) {
  if (e.stopPropagation) e.stopPropagation();

  var el = document.getElementById(e.dataTransfer.getData('text'));
  el.parentNode.removeChild(el);
  return false;
});

Answer 1

像这样创建一个辅助变量

addEvent(cookiemonster, 'drop', function (e) {
    if (e.stopPropagation) e.stopPropagation();

    var el = document.getElementById(e.dataTransfer.getData('text'));
    var aux = el.parentNode;
    aux.removeChild(el);
    return false;
});