无法在Bootstrap 4.0中正确放置下拉菜单

问题描述：

直接从Bootstrap 4页面（http://v4-alpha.getbootstrap.com/components/dropdowns/）取得代码，我已经将下拉菜单定位/设置并正常工作，但下拉框位于页面最左侧，而不是直接位于下方按钮。不知道为什么。任何人都知道我应该如何解决这个问题？的jsfiddle显示问题：https://jsfiddle.net/1m0g2fvh/无法在Bootstrap 4.0中正确放置下拉菜单

用标准引导4

相关的HTML：

<!DOCTYPE html> 
<html lang="en"> 
    <head> 
    <!-- Required meta tags always come first --> 
    <meta charset="utf-8"> 
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"> 
    <meta http-equiv="x-ua-compatible" content="ie=edge"> 

    <!-- Bootstrap CSS --> 
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.2/css/bootstrap.min.css" integrity="sha384-y3tfxAZXuh4HwSYylfB+J125MxIs6mR5FOHamPBG064zB+AFeWH94NdvaCBm8qnd" crossorigin="anonymous"> 
    </head> 
    <body> 
    <nav class="navbar navbar-dark bg-inverse"> 
    <a class="navbar-brand" href="#">Navbar</a> 
    <ul class="nav navbar-nav"> 
    <li class="nav-item active"> 
     <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a> 
    </li> 
    <li class="nav-item"> 
     <button class="btn btn-secondary dropdown-toggle bg-inverse" style="border:none;" type="button" id="dropdownMenu1" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"> 
    Dropdown 
    </button> 
    <div class="dropdown-menu dropdown-menu" aria-labelledby="dropdownMenu1" > 
    <a class="dropdown-item" href="#">Action</a> 
    <a class="dropdown-item" href="#">Another action</a> 
    <a class="dropdown-item" href="#">Something else here</a> 
    </div> 
    </li> 
    <li class="nav-item"> 
     <a class="nav-link" href="#">Pricing</a> 
    </li> 
    <li class="nav-item"> 
     <a class="nav-link" href="#">About</a> 
    </li> 
    </ul> 
    <form class="form-inline pull-xs-right"> 
    <input class="form-control" type="text" placeholder="Search"> 
    <button class="btn btn-success-outline" type="submit">Search</button> 
    </form> 
</nav> 

    <!-- jQuery first, then Bootstrap JS. --> 
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script> 
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.2/js/bootstrap.min.js" integrity="sha384-vZ2WRJMwsjRMW/8U7i6PWi6AlO1L79snBrmgiDpgIWJ82z8eA5lenwvxbMV1PAh7" crossorigin="anonymous"></script> 
    </body> 
</html>

答

添加类父李dropdown

裹下拉的触发和内.dropdown下拉菜单，或声明的另一个元素position: relative;。然后，添加菜单的HTML。

<li class="nav-item dropdown">

https://jsfiddle.net/1m0g2fvh/1/

答

试试这个：

<body> 
    <nav class="navbar navbar-dark bg-inverse"> 
    <a class="navbar-brand" href="#">Navbar</a> 
    <ul class="nav navbar-nav"> 
    <li class="nav-item active"> 
     <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a> 
    </li> 
    <li class="nav-item dropdown"> 
     <button class="btn btn-secondary dropdown-toggle bg-inverse" style="border:none;" type="button" id="dropdownMenu1" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"> 
    Dropdown 
    </button> 
    <div class="dropdown-menu dropdown-menu" aria-labelledby="dropdownMenu1" > 
    <a class="dropdown-item" href="#">Action</a> 
    <a class="dropdown-item" href="#">Another action</a> 
    <a class="dropdown-item" href="#">Something else here</a> 
    </div> 
    </li> 
    <li class="nav-item"> 
     <a class="nav-link" href="#">Pricing</a> 
    </li> 
    <li class="nav-item"> 
     <a class="nav-link" href="#">About</a> 
    </li> 
    </ul> 
    <form class="form-inline pull-xs-right"> 
    <input class="form-control" type="text" placeholder="Search"> 
    <button class="btn btn-success-outline" type="submit">Search</button> 
    </form> 
</nav> 

    <!-- jQuery first, then Bootstrap JS. --> 
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script> 
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.2/js/bootstrap.min.js" integrity="sha384-vZ2WRJMwsjRMW/8U7i6PWi6AlO1L79snBrmgiDpgIWJ82z8eA5lenwvxbMV1PAh7" crossorigin="anonymous"></script> 
    </body>

DEMO HERE

答

在为引导的文档，他们说需要用CSS对齐下拉菜单的排列。我想这和它的作品

.dropdown-menu{ margin-left:20%; }

答

尝试此添加这种风格

.navbar-nav .nav-item+.nav-item{position:relative}

这是工作

无法在Bootstrap 4.0中正确放置下拉菜单

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