twitter-bootstrap - Bootstrap 4 Beta - 是否需要 Popper.js？

Question

如果我不使用下拉菜单，我想问一下 Popper.js 是否绝对必要。
如果没有库，是否还有其他由 popper 驱动的部分无法工作？

Answer 1

如果您在 Bootstrap 4's documentation 中搜索“popper” ，会出现以下结果:

Tooltips rely on the 3rd party library Popper.js for positioning.

Popovers rely on the 3rd party library Popper.js for positioning.

Dropdowns are built on a third party library, Popper.js, which provides dynamic positioning and viewport detection.

所以这些是需要 Popper.js 的 Bootstrap 4 组件。
虽然 Popper.js 被声明为 Bootstrap 4 的要求，并且 Bootstrap 4 JS 如果找不到 Popper 则会记录错误， 如果您不需要工具提示、弹出框、下拉菜单或模式，您仍然可以在没有 Popper 的情况下使用 Bootstrap 4 JS。
例如导航栏的 JS 功能(右侧的移动菜单)运行良好:

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css" integrity="sha384-/Y6pD6FV/Vv2HJnA6t+vslU6fwYXjCFtcEpHbNJ0lyAFsXTsjBbfaDjzALeQsN6M" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/js/bootstrap.min.js" integrity="sha384-h0AbiXch4ZDo7tp9hKZ4TsHbi047NrKGLO3SEJAg45jXxnGIfYzk4Si90RDIqNm1" crossorigin="anonymous"></script>
<nav class="navbar navbar-expand-lg navbar-light bg-light">
  <a class="navbar-brand" href="#">Navbar</a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>

  <div class="collapse navbar-collapse" id="navbarSupportedContent">
    <ul class="navbar-nav mr-auto">
      <li class="nav-item active">
        <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Link</a>
      </li>
      <li class="nav-item">
        <a class="nav-link disabled" href="#">Disabled</a>
      </li>
    </ul>
    <form class="form-inline my-2 my-lg-0">
      <input class="form-control mr-sm-2" type="text" placeholder="Search" aria-label="Search">
      <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
    </form>
  </div>
</nav>