单击不选择纯JavaScript中的可编辑内容元素的方法

element.addEventListener('mousedown', function(event) {
  event.preventDefault();
});

<div contentEditable="false">This content is not editable.</div>

.unselectable {
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

<div class="unselectable">This content is not selectable.</div>