(PHP 5, PHP 7, PHP 8)
DOMElement::removeAttribute — Removes attribute
$qualifiedName): bool
   Removes attribute named qualifiedName from the element.
  
qualifiedNameThe name of the attribute.
   成功时返回 true, 或者在失败时返回 false。
  
DOM_NO_MODIFICATION_ALLOWED_ERRRaised if the node is readonly.